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<head>
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<meta charset=utf-8>
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<meta name=viewport content="width=device-width,initial-scale=1,shrink-to-fit=no">
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<meta name=generator content="Hugo 0.92.2">
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<meta name=generator content="Hugo 0.93.0">
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<link rel="shortcut icon" href=/favicons/favicon.ico>
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<link rel=apple-touch-icon href=/favicons/apple-touch-icon-180x180.png sizes=180x180>
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<link rel=icon type=image/png href=/favicons/android-96x96.png sizes=96x96>
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<link rel=icon type=image/png href=/favicons/android-144x144.png sizes=144x144>
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<link rel=icon type=image/png href=/favicons/android-192x192.png sizes=192x192>
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<title>Cross Session Events | alguidelines.dev - Business Central Design Patterns</title>
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<meta name=description content="By Nikolai L’Estrange, from TVision Technology Ltd. in the UK
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<title>Cross Session Events | alguidelines.dev - Business Central Design Patterns</title><meta name=description content="By Nikolai L’Estrange, from TVision Technology Ltd. in the UK
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Abstract
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Track things that happen in other NAV Sessions.
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@ -47,8 +46,7 @@ Problem In Microsoft Dynamics NAV you can fire a function whenever something cha
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<link href=/scss/main.min.84a617ff0c0265eb62b5cd2929c572f4ed37dc4907d0cf068be4eb2974f6d60f.css rel=stylesheet integrity>
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<script src=https://code.jquery.com/jquery-3.6.0.min.js integrity=sha384-vtXRMe3mGCbOeY7l30aIg8H9p3GdeSe4IFlP6G8JMa7o7lXvnz3GFKzPxzJdPfGK crossorigin=anonymous></script>
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</head>
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<body class=td-page>
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</head><body class=td-page>
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<header>
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<nav class="js-navbar-scroll navbar navbar-expand navbar-dark flex-column flex-md-row td-navbar">
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<a class=navbar-brand href=/>
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@ -60,36 +58,24 @@ Problem In Microsoft Dynamics NAV you can fire a function whenever something cha
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<ul class="navbar-nav mt-2 mt-lg-0">
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<li class="nav-item mr-4 mb-2 mb-lg-0">
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||||
<a class=nav-link href=/docs/><i class="fas fa-book"></i><span>Docs</span></a>
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||||
</li>
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||||
<li class="nav-item mr-4 mb-2 mb-lg-0">
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</li><li class="nav-item mr-4 mb-2 mb-lg-0">
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<a class=nav-link href=https://github.com/microsoft/alguidelines/discussions/ target=_blank><i class="fas fa-comments"></i><span>Discussions</span></a>
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</li>
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||||
<li class="nav-item mr-4 mb-2 mb-lg-0">
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||||
</li><li class="nav-item mr-4 mb-2 mb-lg-0">
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<a class=nav-link href=https://github.com/microsoft/alguidelines target=_blank><i class="fab fa-github"></i><span>GitHub</span></a>
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||||
</li>
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||||
<li class="nav-item mr-4 mb-2 mb-lg-0">
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||||
</li><li class="nav-item mr-4 mb-2 mb-lg-0">
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||||
<a class=nav-link href=https://discord.gg/4wbfNv3 target=_blank><i class="fab fa-discord"></i><span>Discord</span></a>
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||||
</li>
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||||
</ul>
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||||
</div>
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||||
<div class="navbar-nav d-none d-lg-block"><input type=search class="form-control td-search-input" placeholder=" Search this site…" aria-label="Search this site…" autocomplete=off data-offline-search-index-json-src=/offline-search-index.9ab69a84696ad11cb17318558d9706e3.json data-offline-search-base-href=/ data-offline-search-max-results=10>
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||||
</div>
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</nav>
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</header>
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<div class="container-fluid td-outer">
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</li></ul></div><div class="navbar-nav d-none d-lg-block"><input type=search class="form-control td-search-input" placeholder=" Search this site…" aria-label="Search this site…" autocomplete=off data-offline-search-index-json-src=/offline-search-index.c6558a635de208ea1007e79e444e323a.json data-offline-search-base-href=/ data-offline-search-max-results=10>
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</div></nav></header><div class="container-fluid td-outer">
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<div class=td-main>
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<div class="row flex-xl-nowrap">
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<aside class="col-12 col-md-3 col-xl-2 td-sidebar d-print-none">
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<div id=td-sidebar-menu class=td-sidebar__inner>
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<div id=content-mobile>
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<form class="td-sidebar__search d-flex align-items-center">
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<input type=search class="form-control td-search-input" placeholder=" Search this site…" aria-label="Search this site…" autocomplete=off data-offline-search-index-json-src=/offline-search-index.9ab69a84696ad11cb17318558d9706e3.json data-offline-search-base-href=/ data-offline-search-max-results=10>
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<input type=search class="form-control td-search-input" placeholder=" Search this site…" aria-label="Search this site…" autocomplete=off data-offline-search-index-json-src=/offline-search-index.c6558a635de208ea1007e79e444e323a.json data-offline-search-base-href=/ data-offline-search-max-results=10>
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||||
<button class="btn btn-link td-sidebar__toggle d-md-none p-0 ml-3 fas fa-bars" type=button data-toggle=collapse data-target=#td-section-nav aria-controls=td-docs-nav aria-expanded=false aria-label="Toggle section navigation">
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</button>
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</form>
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</div>
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<div id=content-desktop></div>
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<nav class="collapse td-sidebar-nav" id=td-section-nav>
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</form></div><div id=content-desktop></div><nav class="collapse td-sidebar-nav" id=td-section-nav>
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<ul class="td-sidebar-nav__section pr-md-3 ul-0">
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<li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child active-path" id=m-docs-li>
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<a href=/docs/ title="AL Guidelines" class="align-left pl-0 td-sidebar-link td-sidebar-link__section tree-root" id=m-docs><span>Docs</span></a>
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@ -107,9 +93,9 @@ Problem In Microsoft Dynamics NAV you can fire a function whenever something cha
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<a href=/docs/patterns/facade-pattern/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docspatternsfacade-pattern><span>Façade</span></a>
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</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docspatternsgeneric-method-pattern-li>
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<a href=/docs/patterns/generic-method-pattern/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docspatternsgeneric-method-pattern><span>Generic Method</span></a>
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</li>
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</ul>
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</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsbestpractices-li>
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</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docspatternsno-series-li>
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<a href=/docs/patterns/no-series/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docspatternsno-series><span>No. Series</span></a>
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</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsbestpractices-li>
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<a href=/docs/bestpractices/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsbestpractices><span>Best Practices</span></a>
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<ul class="ul-2 foldable">
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<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsbestpracticesapi-page-li>
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<a href=/docs/bestpractices/variable-naming/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsbestpracticesvariable-naming><span>Variable Naming</span></a>
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</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsbestpracticesvariables-declarations-order-li>
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<a href=/docs/bestpractices/variables-declarations-order/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsbestpracticesvariables-declarations-order><span>Variables Declarations Order</span></a>
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</li>
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||||
</ul>
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||||
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child active-path" id=m-docsnavpatterns-li>
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</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child active-path" id=m-docsnavpatterns-li>
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<a href=/docs/navpatterns/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns><span>NAV Patterns Archive</span></a>
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||||
<ul class="ul-2 foldable">
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||||
<li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child active-path" id=m-docsnavpatternspatterns-li>
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<ul class="ul-4 foldable">
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<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsblocked-entitydata-driven-blocked-entity-li>
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||||
<a href=/docs/navpatterns/patterns/blocked-entity/data-driven-blocked-entity/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsblocked-entitydata-driven-blocked-entity><span>Data Driven Blocked Entity</span></a>
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</li>
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||||
</ul>
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</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternscached-web-service-calls-li>
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</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternscached-web-service-calls-li>
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<a href=/docs/navpatterns/patterns/cached-web-service-calls/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternscached-web-service-calls><span>Cached Web Server Calls</span></a>
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</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsconditional-cascading-update-li>
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<a href=/docs/navpatterns/patterns/conditional-cascading-update/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsconditional-cascading-update><span>Conditional Cascading Update</span></a>
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<ul class="ul-4 foldable">
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<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsnet-exception-handling-in-caltryfunction-net-exception-handling-in-cal-li>
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<a href=/docs/navpatterns/patterns/net-exception-handling-in-cal/tryfunction-net-exception-handling-in-cal/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsnet-exception-handling-in-caltryfunction-net-exception-handling-in-cal><span>TryFunction NET Exception Handling in CAL</span></a>
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</li>
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</ul>
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</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsno-series-li>
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</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsno-series-li>
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<a href=/docs/navpatterns/patterns/no-series/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsno-series><span>No Series</span></a>
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</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsnavpatternspatternsnotifications-li>
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<a href=/docs/navpatterns/patterns/notifications/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatternspatternsnotifications><span>Notifications</span></a>
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<a href=/docs/navpatterns/patterns/notifications/in-context-notifications/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsnotificationsin-context-notifications><span>In-context Notifications</span></a>
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||||
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsnotificationsnotification-lifecycle-management-pattern-li>
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||||
<a href=/docs/navpatterns/patterns/notifications/notification-lifecycle-management-pattern/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsnotificationsnotification-lifecycle-management-pattern><span>Notification Lifecycle Management Pattern</span></a>
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</li>
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||||
</ul>
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||||
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsobserver-li>
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||||
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsobserver-li>
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<a href=/docs/navpatterns/patterns/observer/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsobserver><span>Observer</span></a>
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</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsposting-routine-select-behavior-li>
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<a href=/docs/navpatterns/patterns/posting-routine-select-behavior/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsposting-routine-select-behavior><span>Posting Routine - Select Behavior</span></a>
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<a href=/docs/navpatterns/patterns/queries/use-queries-to-detect-duplicate-records/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsqueriesuse-queries-to-detect-duplicate-records><span>Use Queries to Detect Duplicate Records</span></a>
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</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternsqueriesuse-queries-to-replace-nested-loops-li>
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||||
<a href=/docs/navpatterns/patterns/queries/use-queries-to-replace-nested-loops/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsqueriesuse-queries-to-replace-nested-loops><span>Use Queries to Replace Nested Loops</span></a>
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</li>
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||||
</ul>
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||||
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsread-once-initialization-and-validation-li>
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||||
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsread-once-initialization-and-validation-li>
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||||
<a href=/docs/navpatterns/patterns/read-once-initialization-and-validation/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsread-once-initialization-and-validation><span>Read-once Initialization and Validation</span></a>
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</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsreleased-entity-li>
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||||
<a href=/docs/navpatterns/patterns/released-entity/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsreleased-entity><span>Released Entity</span></a>
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<a href=/docs/navpatterns/patterns/security/4-masked-text/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssecurity4-masked-text><span>Masked Text</span></a>
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||||
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternssecurity5-ssl-in-nav-li>
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||||
<a href=/docs/navpatterns/patterns/security/5-ssl-in-nav/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssecurity5-ssl-in-nav><span>SSL in NAV</span></a>
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||||
</li>
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||||
</ul>
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||||
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternssetup-specificity-fallback-li>
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||||
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternssetup-specificity-fallback-li>
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||||
<a href=/docs/navpatterns/patterns/setup-specificity-fallback/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssetup-specificity-fallback><span>Setup Specificity Fallback</span></a>
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||||
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternssilent-file-upload-and-download-li>
|
||||
<a href=/docs/navpatterns/patterns/silent-file-upload-and-download/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssilent-file-upload-and-download><span>Silent File Upload and Download</span></a>
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<a href=/docs/navpatterns/patterns/singleton/singleton-table/cue-table/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssingletonsingleton-tablecue-table><span>Cue Table</span></a>
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||||
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatternspatternssingletonsingleton-tablesetup-table-li>
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||||
<a href=/docs/navpatterns/patterns/singleton/singleton-table/setup-table/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternssingletonsingleton-tablesetup-table><span>Setup Table</span></a>
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||||
</li>
|
||||
</ul>
|
||||
</li>
|
||||
</ul>
|
||||
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsstandard-journal-li>
|
||||
</li></ul></li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsstandard-journal-li>
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||||
<a href=/docs/navpatterns/patterns/standard-journal/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsstandard-journal><span>Standard Journal</span></a>
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||||
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternstemporary-dataset-report-li>
|
||||
<a href=/docs/navpatterns/patterns/temporary-dataset-report/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternstemporary-dataset-report><span>Temporary Dataset Report</span></a>
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||||
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<a href=/docs/navpatterns/patterns/transfer-custom-fields/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternstransfer-custom-fields><span>Transfer Custom Fields</span></a>
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||||
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternspatternsvariant-facade-li>
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||||
<a href=/docs/navpatterns/patterns/variant-facade/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternspatternsvariant-facade><span>Variant Facade</span></a>
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||||
</li>
|
||||
</ul>
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||||
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsnavpatterns2-anti-patterns-li>
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||||
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsnavpatterns2-anti-patterns-li>
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||||
<a href=/docs/navpatterns/2-anti-patterns/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns2-anti-patterns><span>2. Anti-Patterns</span></a>
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||||
<ul class="ul-3 foldable">
|
||||
<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns2-anti-patternsnav-upgrade-li>
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||||
<a href=/docs/navpatterns/2-anti-patterns/nav-upgrade/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns2-anti-patternsnav-upgrade><span>Nav Upgrade</span></a>
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||||
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns2-anti-patternsreusable-bugs-li>
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||||
<a href=/docs/navpatterns/2-anti-patterns/reusable-bugs/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns2-anti-patternsreusable-bugs><span>Reusable Bugs</span></a>
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||||
</li>
|
||||
</ul>
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||||
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsnavpatterns3-cal-coding-guidelines-li>
|
||||
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsnavpatterns3-cal-coding-guidelines-li>
|
||||
<a href=/docs/navpatterns/3-cal-coding-guidelines/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns3-cal-coding-guidelines><span>3. CAL Coding Guidelines</span></a>
|
||||
<ul class="ul-3 foldable">
|
||||
<li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesdesign-li>
|
||||
|
|
@ -356,18 +322,14 @@ Problem In Microsoft Dynamics NAV you can fire a function whenever something cha
|
|||
<a href=/docs/navpatterns/3-cal-coding-guidelines/design/variable-capacity-mismatch/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesdesignvariable-capacity-mismatch><span>Variable Capacity Mismatch</span></a>
|
||||
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesdesignwith-scope-name-collision-li>
|
||||
<a href=/docs/navpatterns/3-cal-coding-guidelines/design/with-scope-name-collision/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesdesignwith-scope-name-collision><span>WITH Scope Name Collision</span></a>
|
||||
</li>
|
||||
</ul>
|
||||
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesinternally-used-dot-net-types-li>
|
||||
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesinternally-used-dot-net-types-li>
|
||||
<a href=/docs/navpatterns/3-cal-coding-guidelines/internally-used-dot-net-types/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesinternally-used-dot-net-types><span>Internally used DotNet Types</span></a>
|
||||
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesinternationalization-li>
|
||||
<a href=/docs/navpatterns/3-cal-coding-guidelines/internationalization/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns3-cal-coding-guidelinesinternationalization><span>Internationalization</span></a>
|
||||
<ul class="ul-4 foldable">
|
||||
<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesinternationalizationusing-calcdate-li>
|
||||
<a href=/docs/navpatterns/3-cal-coding-guidelines/internationalization/using-calcdate/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesinternationalizationusing-calcdate><span>Using Calcdate</span></a>
|
||||
</li>
|
||||
</ul>
|
||||
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child collapse" id=m-docsnavpatterns3-cal-coding-guidelineslocalizability-li>
|
||||
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child collapse" id=m-docsnavpatterns3-cal-coding-guidelineslocalizability-li>
|
||||
<a href=/docs/navpatterns/3-cal-coding-guidelines/localizability/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns3-cal-coding-guidelineslocalizability><span>Localizability</span></a>
|
||||
<ul class="ul-4 foldable">
|
||||
<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelineslocalizabilitycaptionml-for-system-tables-li>
|
||||
|
|
@ -380,9 +342,7 @@ Problem In Microsoft Dynamics NAV you can fire a function whenever something cha
|
|||
<a href=/docs/navpatterns/3-cal-coding-guidelines/localizability/use-text-constants/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelineslocalizabilityuse-text-constants><span>Use Text Constants</span></a>
|
||||
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelineslocalizabilityusing-optioncaptionml-li>
|
||||
<a href=/docs/navpatterns/3-cal-coding-guidelines/localizability/using-optioncaptionml/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelineslocalizabilityusing-optioncaptionml><span>Using OptionCaptionML</span></a>
|
||||
</li>
|
||||
</ul>
|
||||
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadability-li>
|
||||
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadability-li>
|
||||
<a href=/docs/navpatterns/3-cal-coding-guidelines/readability/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns3-cal-coding-guidelinesreadability><span>Readability</span></a>
|
||||
<ul class="ul-4 foldable">
|
||||
<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilitybegin-as-an-afterword-li>
|
||||
|
|
@ -449,9 +409,7 @@ Problem In Microsoft Dynamics NAV you can fire a function whenever something cha
|
|||
<a href=/docs/navpatterns/3-cal-coding-guidelines/readability/variable-naming/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityvariable-naming><span>Variable Naming</span></a>
|
||||
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityvariables-declarations-order-li>
|
||||
<a href=/docs/navpatterns/3-cal-coding-guidelines/readability/variables-declarations-order/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesreadabilityvariables-declarations-order><span>Variables Declarations Order</span></a>
|
||||
</li>
|
||||
</ul>
|
||||
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesux-li>
|
||||
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesux-li>
|
||||
<a href=/docs/navpatterns/3-cal-coding-guidelines/ux/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns3-cal-coding-guidelinesux><span>UX</span></a>
|
||||
<ul class="ul-4 foldable">
|
||||
<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesuxactions-images-li>
|
||||
|
|
@ -462,11 +420,7 @@ Problem In Microsoft Dynamics NAV you can fire a function whenever something cha
|
|||
<a href=/docs/navpatterns/3-cal-coding-guidelines/ux/fielderror/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesuxfielderror><span>FIELDERROR</span></a>
|
||||
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns3-cal-coding-guidelinesuxmessage-and-error-li>
|
||||
<a href=/docs/navpatterns/3-cal-coding-guidelines/ux/message-and-error/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns3-cal-coding-guidelinesuxmessage-and-error><span>MESSAGE and ERROR</span></a>
|
||||
</li>
|
||||
</ul>
|
||||
</li>
|
||||
</ul>
|
||||
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsnavpatterns4-get-involved-li>
|
||||
</li></ul></li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docsnavpatterns4-get-involved-li>
|
||||
<a href=/docs/navpatterns/4-get-involved/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docsnavpatterns4-get-involved><span>(OLD) Get Involved</span></a>
|
||||
<ul class="ul-3 foldable">
|
||||
<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns4-get-involvedcode-of-conduct-li>
|
||||
|
|
@ -475,13 +429,9 @@ Problem In Microsoft Dynamics NAV you can fire a function whenever something cha
|
|||
<a href=/docs/navpatterns/4-get-involved/patterns-authors/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns4-get-involvedpatterns-authors><span>Patterns Authors</span></a>
|
||||
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docsnavpatterns4-get-involvedtemplate-for-writing-nav-design-patterns-li>
|
||||
<a href=/docs/navpatterns/4-get-involved/template-for-writing-nav-design-patterns/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatterns4-get-involvedtemplate-for-writing-nav-design-patterns><span>Template for writing Nav Design Patterns</span></a>
|
||||
</li>
|
||||
</ul>
|
||||
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternsrelated-links-li>
|
||||
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-docsnavpatternsrelated-links-li>
|
||||
<a href=/docs/navpatterns/related-links/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docsnavpatternsrelated-links><span>Related Links</span></a>
|
||||
</li>
|
||||
</ul>
|
||||
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docscontributing-li>
|
||||
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-docscontributing-li>
|
||||
<a href=/docs/contributing/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docscontributing><span>Contributing</span></a>
|
||||
<ul class="ul-2 foldable">
|
||||
<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docscontributingformattingtips-li>
|
||||
|
|
@ -497,27 +447,14 @@ Problem In Microsoft Dynamics NAV you can fire a function whenever something cha
|
|||
<a href=/docs/contributing/installhugo/manuallyonwindows11/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docscontributinginstallhugomanuallyonwindows11><span>Manually on Windows 11</span></a>
|
||||
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docscontributinginstallhugousingpowershellonwindows11-li>
|
||||
<a href=/docs/contributing/installhugo/usingpowershellonwindows11/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docscontributinginstallhugousingpowershellonwindows11><span>Powershell on Windows 11</span></a>
|
||||
</li>
|
||||
</ul>
|
||||
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child collapse" id=m-docscontributingtemplates-li>
|
||||
</li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child collapse" id=m-docscontributingtemplates-li>
|
||||
<a href=/docs/contributing/templates/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-docscontributingtemplates><span>Templates</span></a>
|
||||
<ul class="ul-3 foldable">
|
||||
<li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docscontributingtemplatespatterns-li>
|
||||
<a href=/docs/contributing/templates/patterns/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docscontributingtemplatespatterns><span>Pattern Name</span></a>
|
||||
</li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child collapse" id=m-docscontributingtemplatesbestpractice-li>
|
||||
<a href=/docs/contributing/templates/bestpractice/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-docscontributingtemplatesbestpractice><span>Title Here</span></a>
|
||||
</li>
|
||||
</ul>
|
||||
</li>
|
||||
</ul>
|
||||
</li>
|
||||
</ul>
|
||||
</li>
|
||||
</ul>
|
||||
</nav>
|
||||
</div>
|
||||
</aside>
|
||||
<aside class="d-none d-xl-block col-xl-2 td-sidebar-toc d-print-none">
|
||||
</li></ul></li></ul></li></ul></li></ul></nav></div></aside><aside class="d-none d-xl-block col-xl-2 td-sidebar-toc d-print-none">
|
||||
<div class="td-page-meta ml-2 pb-1 pt-2 mb-0">
|
||||
<a href=https://github.com/microsoft/alguidelines/tree/main/content/docs/NAVPatterns/patterns/cross-session-events/index.md class=td-page-meta--view target=_blank rel=noopener><i class="fa fa-file-alt fa-fw"></i> View page source</a>
|
||||
<a href=https://github.com/microsoft/alguidelines/edit/main/content/docs/NAVPatterns/patterns/cross-session-events/index.md class=td-page-meta--edit target=_blank rel=noopener><i class="fa fa-edit fa-fw"></i> Edit this page</a>
|
||||
|
|
@ -525,263 +462,130 @@ Problem In Microsoft Dynamics NAV you can fire a function whenever something cha
|
|||
<a href="https://github.com/microsoft/alguidelines/issues/new?title=Cross%20Session%20Events" class=td-page-meta--issue target=_blank rel=noopener><i class="fab fa-github fa-fw"></i> Create Issue</a>
|
||||
<a href="https://github.com/microsoft/alguidelines/discussions?discussions_q=Cross%20Session%20Events" class=td-page-meta--issue target=_blank rel=noopener><i class="fab fa-github fa-fw"></i> Discussions</a>
|
||||
<a href=https://github.com/microsoft/alguidelines/issues/new class=td-page-meta--project-issue target=_blank rel=noopener><i class="fas fa-tasks fa-fw"></i> Create project issue</a>
|
||||
</div>
|
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<div class=td-toc><nav id=TableOfContents>
|
||||
</div><div class=td-toc><nav id=TableOfContents>
|
||||
<ul>
|
||||
<li><a href=#abstract>Abstract</a></li>
|
||||
<li><a href=#problem>Problem</a></li>
|
||||
<li><a href=#solution>Solution</a></li>
|
||||
<li><a href=#example>Example</a></li>
|
||||
<li><a href=#consequences>Consequences</a></li>
|
||||
<li><a href=#related-topics>Related Topics</a></li>
|
||||
</ul>
|
||||
</nav></div>
|
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<h5 class=taxonomy-title>Tag Cloud</h5>
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<li><a class=taxonomy-term href=https://alguidelines.dev/tags/al/ data-taxonomy-term=al><span class=taxonomy-label>AL</span><span class=taxonomy-count>29</span></a></li>
|
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<li><a class=taxonomy-term href=https://alguidelines.dev/tags/api/ data-taxonomy-term=api><span class=taxonomy-label>API</span><span class=taxonomy-count>3</span></a></li>
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<li><a class=taxonomy-term href=https://alguidelines.dev/tags/c/al/ data-taxonomy-term=c/al><span class=taxonomy-label>C/AL</span><span class=taxonomy-count>136</span></a></li>
|
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<li><a class=taxonomy-term href=https://alguidelines.dev/tags/decoupling/ data-taxonomy-term=decoupling><span class=taxonomy-label>Decoupling</span><span class=taxonomy-count>2</span></a></li>
|
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<li><a class=taxonomy-term href=https://alguidelines.dev/tags/extendability/ data-taxonomy-term=extendability><span class=taxonomy-label>Extendability</span><span class=taxonomy-count>3</span></a></li>
|
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<li><a class=taxonomy-term href=https://alguidelines.dev/tags/interface/ data-taxonomy-term=interface><span class=taxonomy-label>Interface</span><span class=taxonomy-count>1</span></a></li>
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<li><a class=taxonomy-term href=https://alguidelines.dev/tags/performance/ data-taxonomy-term=performance><span class=taxonomy-label>Performance</span><span class=taxonomy-count>2</span></a></li>
|
||||
<li><a class=taxonomy-term href=https://alguidelines.dev/tags/readability/ data-taxonomy-term=readability><span class=taxonomy-label>Readability</span><span class=taxonomy-count>53</span></a></li>
|
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<li><a class=taxonomy-term href=https://alguidelines.dev/tags/telemetry/ data-taxonomy-term=telemetry><span class=taxonomy-label>Telemetry</span><span class=taxonomy-count>1</span></a></li>
|
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<li><a class=taxonomy-term href=https://alguidelines.dev/tags/testability/ data-taxonomy-term=testability><span class=taxonomy-label>Testability</span><span class=taxonomy-count>2</span></a></li>
|
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|
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|
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<div class="taxonomy taxonomy-terms-cloud taxo-categories">
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<h5 class=taxonomy-title>Categories</h5>
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<li><a class=taxonomy-term href=https://alguidelines.dev/categories/best-practice/ data-taxonomy-term=best-practice><span class=taxonomy-label>Best Practice</span><span class=taxonomy-count>86</span></a></li>
|
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<li><a class=taxonomy-term href=https://alguidelines.dev/categories/pattern/ data-taxonomy-term=pattern><span class=taxonomy-label>Pattern</span><span class=taxonomy-count>70</span></a></li>
|
||||
</ul>
|
||||
</div>
|
||||
</aside>
|
||||
<main class="col-12 col-md-9 col-xl-8 pl-md-5" role=main>
|
||||
<li><a href=#abstract>Abstract</a></li><li><a href=#problem>Problem</a></li><li><a href=#solution>Solution</a></li><li><a href=#example>Example</a></li><li><a href=#consequences>Consequences</a></li><li><a href=#related-topics>Related Topics</a></li></ul></nav></div><div class="taxonomy taxonomy-terms-cloud taxo-tags">
|
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<h5 class=taxonomy-title>Tag Cloud</h5><ul class=taxonomy-terms>
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<li><a class=taxonomy-term href=https://alguidelines.dev/tags/al/ data-taxonomy-term=al><span class=taxonomy-label>AL</span><span class=taxonomy-count>30</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/api/ data-taxonomy-term=api><span class=taxonomy-label>API</span><span class=taxonomy-count>3</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/c/al/ data-taxonomy-term=c/al><span class=taxonomy-label>C/AL</span><span class=taxonomy-count>136</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/decoupling/ data-taxonomy-term=decoupling><span class=taxonomy-label>Decoupling</span><span class=taxonomy-count>2</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/extendability/ data-taxonomy-term=extendability><span class=taxonomy-label>Extendability</span><span class=taxonomy-count>3</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/interface/ data-taxonomy-term=interface><span class=taxonomy-label>Interface</span><span class=taxonomy-count>1</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/performance/ data-taxonomy-term=performance><span class=taxonomy-label>Performance</span><span class=taxonomy-count>2</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/readability/ data-taxonomy-term=readability><span class=taxonomy-label>Readability</span><span class=taxonomy-count>53</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/telemetry/ data-taxonomy-term=telemetry><span class=taxonomy-label>Telemetry</span><span class=taxonomy-count>1</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/testability/ data-taxonomy-term=testability><span class=taxonomy-label>Testability</span><span class=taxonomy-count>2</span></a></li></ul></div><div class="taxonomy taxonomy-terms-cloud taxo-categories">
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<h5 class=taxonomy-title>Categories</h5><ul class=taxonomy-terms>
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<li><a class=taxonomy-term href=https://alguidelines.dev/categories/best-practice/ data-taxonomy-term=best-practice><span class=taxonomy-label>Best Practice</span><span class=taxonomy-count>86</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/categories/pattern/ data-taxonomy-term=pattern><span class=taxonomy-label>Pattern</span><span class=taxonomy-count>71</span></a></li></ul></div></aside><main class="col-12 col-md-9 col-xl-8 pl-md-5" role=main>
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<a href=https://alguidelines.dev/docs/navpatterns/>NAV Patterns Archive</a>
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<li class=breadcrumb-item>
|
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</li><li class=breadcrumb-item>
|
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<a href=https://alguidelines.dev/docs/navpatterns/patterns/>1. Patterns</a>
|
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<a href=https://alguidelines.dev/docs/navpatterns/patterns/cross-session-events/>Cross Session Events</a>
|
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</li>
|
||||
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|
||||
</nav>
|
||||
<div class=td-content>
|
||||
<h1>Cross Session Events</h1>
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||||
<header class=article-meta>
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</li></ol></nav><div class=td-content>
|
||||
<h1>Cross Session Events</h1><header class=article-meta>
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<h5 class=taxonomy-title>Tags:</h5>
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|
||||
<li><a class=taxonomy-term href=https://alguidelines.dev/tags/c/al/ data-taxonomy-term=c/al><span class=taxonomy-label>C/AL</span></a></li>
|
||||
</ul>
|
||||
</div>
|
||||
<div class="taxonomy taxonomy-terms-article taxo-categories">
|
||||
<h5 class=taxonomy-title>Categories:</h5>
|
||||
<ul class=taxonomy-terms>
|
||||
<li><a class=taxonomy-term href=https://alguidelines.dev/categories/pattern/ data-taxonomy-term=pattern><span class=taxonomy-label>Pattern</span></a></li>
|
||||
</ul>
|
||||
</div>
|
||||
</header>
|
||||
<p><em>By Nikolai L’Estrange, from TVision Technology Ltd. in the UK</em></p>
|
||||
<h2 id=abstract>Abstract</h2>
|
||||
<p>Track things that happen in other NAV Sessions.</p>
|
||||
<p><a href=PubSub.png><img src=PubSub.png alt=" "></a></p>
|
||||
<h2 id=problem>Problem</h2>
|
||||
<p>In Microsoft Dynamics NAV you can fire a function whenever something changes within your session (and from NAV 2016 this is even easier with the new Event model), however there is not an easy way to know what is happening in other sessions. Sometimes you would like to know what has happened since your last read, without reading everything again, e.g. when you need to pass a large dataset to a Control Add-in.</p>
|
||||
<p>A common way of handling this with Ledger Tables is to make note of the last record you read, and continuously poll to see if there are any new records. However this is restricted to strictly sequentially entered tables.</p>
|
||||
<h2 id=solution>Solution</h2>
|
||||
<p>There is a common pattern in many other languages called <a href=https://en.wikipedia.org/wiki/Publish%E2%80%93subscribe_pattern>Publish-Subscribe</a> (or PubSub) that solves the same issue. We can implement the same pattern in NAV using a Table as a message queue platform and polling this table. We have named this pattern “Cross Session Events” in order to avoid confusion with the standard NAV Events which use the terms Publisher and Subscriber, and to try and describe more accurately when you would need this pattern.</p>
|
||||
<p>The pattern has four components:</p>
|
||||
<ul>
|
||||
<li><strong>Publisher(s)</strong>: These push messages to the Message Broker.</li>
|
||||
<li><strong>Subscriber Records</strong>: Identifies the Subscriber and store filters to say what messages the Subscriber and interested in receiving.</li>
|
||||
<li><strong>Message Broker</strong>: This distributes all messages sent in to all Subscribers that have expressed an interest (i.e. the message is within their filters).</li>
|
||||
<li><strong>Message Queue</strong>: To hold the messages for each Subscriber. Generally once these messages are read, they are deleted.</li>
|
||||
</ul>
|
||||
<h2 id=example>Example</h2>
|
||||
<p>An example of this would be when we have multiple users looking at the same set of data and we want their screens to update in “real time” whenever one of them makes a change, without doing a full refresh. We will use the <a href=/navpatterns/1-patterns/observer/>Observer pattern</a> to capture the change (act as the Publisher) and then create a Table to hold Subscribers and Filters (Change Observer), a Table to be the Message Queue (Change Notification), and a Codeunit to be the Message Broker and help with the polling (ObserverMgt).</p>
|
||||
<p>Below are the table definitions:</p>
|
||||
<table>
|
||||
<h5 class=taxonomy-title>Tags:</h5><ul class=taxonomy-terms>
|
||||
<li><a class=taxonomy-term href=https://alguidelines.dev/tags/c/al/ data-taxonomy-term=c/al><span class=taxonomy-label>C/AL</span></a></li></ul></div><div class="taxonomy taxonomy-terms-article taxo-categories">
|
||||
<h5 class=taxonomy-title>Categories:</h5><ul class=taxonomy-terms>
|
||||
<li><a class=taxonomy-term href=https://alguidelines.dev/categories/pattern/ data-taxonomy-term=pattern><span class=taxonomy-label>Pattern</span></a></li></ul></div></header><p><em>By Nikolai L’Estrange, from TVision Technology Ltd. in the UK</em></p><h2 id=abstract>Abstract</h2><p>Track things that happen in other NAV Sessions.</p><p><a href=PubSub.png><img src=PubSub.png alt=" "></a></p><h2 id=problem>Problem</h2><p>In Microsoft Dynamics NAV you can fire a function whenever something changes within your session (and from NAV 2016 this is even easier with the new Event model), however there is not an easy way to know what is happening in other sessions. Sometimes you would like to know what has happened since your last read, without reading everything again, e.g. when you need to pass a large dataset to a Control Add-in.</p><p>A common way of handling this with Ledger Tables is to make note of the last record you read, and continuously poll to see if there are any new records. However this is restricted to strictly sequentially entered tables.</p><h2 id=solution>Solution</h2><p>There is a common pattern in many other languages called <a href=https://en.wikipedia.org/wiki/Publish%E2%80%93subscribe_pattern>Publish-Subscribe</a> (or PubSub) that solves the same issue. We can implement the same pattern in NAV using a Table as a message queue platform and polling this table. We have named this pattern “Cross Session Events” in order to avoid confusion with the standard NAV Events which use the terms Publisher and Subscriber, and to try and describe more accurately when you would need this pattern.</p><p>The pattern has four components:</p><ul>
|
||||
<li><strong>Publisher(s)</strong>: These push messages to the Message Broker.</li><li><strong>Subscriber Records</strong>: Identifies the Subscriber and store filters to say what messages the Subscriber and interested in receiving.</li><li><strong>Message Broker</strong>: This distributes all messages sent in to all Subscribers that have expressed an interest (i.e. the message is within their filters).</li><li><strong>Message Queue</strong>: To hold the messages for each Subscriber. Generally once these messages are read, they are deleted.</li></ul><h2 id=example>Example</h2><p>An example of this would be when we have multiple users looking at the same set of data and we want their screens to update in “real time” whenever one of them makes a change, without doing a full refresh. We will use the <a href=/navpatterns/1-patterns/observer/>Observer pattern</a> to capture the change (act as the Publisher) and then create a Table to hold Subscribers and Filters (Change Observer), a Table to be the Message Queue (Change Notification), and a Codeunit to be the Message Broker and help with the polling (ObserverMgt).</p><p>Below are the table definitions:</p><table>
|
||||
<thead>
|
||||
<tr>
|
||||
<th><strong>Change Observer:</strong></th>
|
||||
<th></th>
|
||||
<th></th>
|
||||
</tr>
|
||||
</thead>
|
||||
<tbody>
|
||||
<th><strong>Change Observer:</strong></th><th></th><th></th></tr></thead><tbody>
|
||||
<tr>
|
||||
<td>“Table ID”</td>
|
||||
<td>Integer</td>
|
||||
<td>“Observable Table”</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>“Server ID”</td>
|
||||
<td>Integer</td>
|
||||
<td></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>“Session ID”</td>
|
||||
<td>Integer</td>
|
||||
<td></td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<table>
|
||||
<td>“Table ID”</td><td>Integer</td><td>“Observable Table”</td></tr><tr>
|
||||
<td>“Server ID”</td><td>Integer</td><td></td></tr><tr>
|
||||
<td>“Session ID”</td><td>Integer</td><td></td></tr></tbody></table><table>
|
||||
<thead>
|
||||
<tr>
|
||||
<th><strong>Change Notification:</strong></th>
|
||||
<th></th>
|
||||
<th></th>
|
||||
</tr>
|
||||
</thead>
|
||||
<tbody>
|
||||
<th><strong>Change Notification:</strong></th><th></th><th></th></tr></thead><tbody>
|
||||
<tr>
|
||||
<td>“Table ID”</td>
|
||||
<td>Integer</td>
|
||||
<td>“Observable Table”</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>“Server ID”</td>
|
||||
<td>Integer</td>
|
||||
<td></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>“Session ID”</td>
|
||||
<td>Integer</td>
|
||||
<td></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>“Entry No.”</td>
|
||||
<td>Integer</td>
|
||||
<td>AutoIncrement</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>“Type of Change”</td>
|
||||
<td>Option</td>
|
||||
<td>Insert,Modify,Delete,Rename</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>“Record ID”</td>
|
||||
<td>RecordID</td>
|
||||
<td></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>… (other fields to indicate what has changed)</td>
|
||||
<td></td>
|
||||
<td></td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<p>The Change Observer table identifies the Subscriber using Server ID and Session ID, and then in this example there is only one filter, which is the Table ID we want to listen to any changes. In this case all three fields are in the Primary Key.</p>
|
||||
<p>The Change Notification table then has the same three fields plus an Entry No. as its Primary Key, and in this example borrows heavily from the Change Log code to fill in the rest of the message.</p>
|
||||
<p><em><strong>Note:</strong></em> Other examples of the pattern could have very different fields to identify the Subscriber, Filters and then whatever fields needed for content of the Message.</p>
|
||||
<p>Our Message Broker Codeunit will also serve as a central place to create Subscribers (Listen and StopListening functions) and a place to Poll for Messages. Note that the Poll function deletes the Messages as it reads them.</p>
|
||||
<div class=highlight><pre tabindex=0 style=background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-al data-lang=al>Listen<span style=color:#ce5c00;font-weight:700>(</span>TableID<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Integer</span><span style=color:#ce5c00;font-weight:700>)
|
||||
</span><span style=color:#ce5c00;font-weight:700></span><span style=color:#204a87;font-weight:700>WITH</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observer<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>DO</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>BEGIN</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span>"Table ID"<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#ce5c00;font-weight:700>:=</span><span style=color:#f8f8f8;text-decoration:underline> </span>TableID<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span>"Server ID"<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#ce5c00;font-weight:700>:=</span><span style=color:#f8f8f8;text-decoration:underline> </span>SERVICEINSTANCEID<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span>"Session ID"<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#ce5c00;font-weight:700>:=</span><span style=color:#f8f8f8;text-decoration:underline> </span>SESSIONID<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span>INSERT<span style=color:#ce5c00;font-weight:700>(</span>TRUE<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span>COMMIT<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>END</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline></span>StopListening<span style=color:#ce5c00;font-weight:700>(</span>TableID<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Integer</span><span style=color:#ce5c00;font-weight:700>)
|
||||
</span><span style=color:#ce5c00;font-weight:700></span><span style=color:#204a87;font-weight:700>WITH</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observer<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>DO</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>BEGIN</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span>RESET<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span>SETRANGE<span style=color:#ce5c00;font-weight:700>(</span>"Server ID"<span style=color:#000;font-weight:700>,</span>SERVICEINSTANCEID<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span>SETRANGE<span style=color:#ce5c00;font-weight:700>(</span>"Session ID"<span style=color:#000;font-weight:700>,</span>SESSIONID<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span>SETRANGE<span style=color:#ce5c00;font-weight:700>(</span>"Table ID"<span style=color:#000;font-weight:700>,</span>TableID<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span>DELETEALL<span style=color:#ce5c00;font-weight:700>(</span>TRUE<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span>COMMIT<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>END</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline></span>NotifyAll<span style=color:#ce5c00;font-weight:700>(</span>ChangeNotification<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Record</span><span style=color:#f8f8f8;text-decoration:underline> </span>"Change Notification"<span style=color:#ce5c00;font-weight:700>)
|
||||
</span><span style=color:#ce5c00;font-weight:700></span><span style=color:#204a87;font-weight:700>WITH</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observer<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>DO</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>BEGIN</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span>RESET<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span>SETRANGE<span style=color:#ce5c00;font-weight:700>(</span>"Table ID"<span style=color:#000;font-weight:700>,</span>ChangeNotification<span style=color:#ce5c00;font-weight:700>.</span>"Table ID"<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>FINDSET<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>REPEAT</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span>Notify<span style=color:#ce5c00;font-weight:700>(</span>Observer<span style=color:#000;font-weight:700>,</span>ChangeNotification<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>UNTIL</span><span style=color:#f8f8f8;text-decoration:underline> </span>NEXT<span style=color:#f8f8f8;text-decoration:underline> </span>=<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#0000cf;font-weight:700>0</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>END</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline></span>Notify<span style=color:#ce5c00;font-weight:700>(</span>Observer<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Record</span><span style=color:#f8f8f8;text-decoration:underline> </span>"Change Observer"<span style=color:#000;font-weight:700>;</span>ChangeNotification<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Record</span><span style=color:#f8f8f8;text-decoration:underline> </span>"Change Notification"<span style=color:#ce5c00;font-weight:700>)
|
||||
</span><span style=color:#ce5c00;font-weight:700></span><span style=color:#204a87;font-weight:700>WITH</span><span style=color:#f8f8f8;text-decoration:underline> </span>ChangeNotification<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>DO</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>BEGIN</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span>"Server ID"<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#ce5c00;font-weight:700>:=</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observer<span style=color:#ce5c00;font-weight:700>.</span>"Server ID"<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span>"Session ID"<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#ce5c00;font-weight:700>:=</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observer<span style=color:#ce5c00;font-weight:700>.</span>"Session ID"<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span>"Entry No."<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#ce5c00;font-weight:700>:=</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#0000cf;font-weight:700>0</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span>INSERT<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>END</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline></span>Poll<span style=color:#ce5c00;font-weight:700>(</span>TableID<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Integer</span><span style=color:#000;font-weight:700>;</span><span style=color:#204a87;font-weight:700>VAR</span><span style=color:#f8f8f8;text-decoration:underline> </span>TempChangeNotification<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>TEMPORARY</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Record</span><span style=color:#f8f8f8;text-decoration:underline> </span>"Change Notification"<span style=color:#ce5c00;font-weight:700>)
|
||||
</span><span style=color:#ce5c00;font-weight:700></span><span style=color:#204a87;font-weight:700>WITH</span><span style=color:#f8f8f8;text-decoration:underline> </span>ChangeNotification<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>DO</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>BEGIN</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span>TempChangeNotification<span style=color:#ce5c00;font-weight:700>.</span>RESET<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span>TempChangeNotification<span style=color:#ce5c00;font-weight:700>.</span>DELETEALL<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span>RESET<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span>SETRANGE<span style=color:#ce5c00;font-weight:700>(</span>"Table ID"<span style=color:#000;font-weight:700>,</span>TableID<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span>SETRANGE<span style=color:#ce5c00;font-weight:700>(</span>"Server ID"<span style=color:#000;font-weight:700>,</span>SERVICEINSTANCEID<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span>SETRANGE<span style=color:#ce5c00;font-weight:700>(</span>"Session ID"<span style=color:#000;font-weight:700>,</span>SESSIONID<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>FINDSET<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>REPEAT</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span>TempChangeNotification<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#ce5c00;font-weight:700>:=</span><span style=color:#f8f8f8;text-decoration:underline> </span>ChangeNotification<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span>TempChangeNotification<span style=color:#ce5c00;font-weight:700>.</span>INSERT<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span>MARK<span style=color:#ce5c00;font-weight:700>(</span>TRUE<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>UNTIL</span><span style=color:#f8f8f8;text-decoration:underline> </span>NEXT<span style=color:#f8f8f8;text-decoration:underline> </span>=<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#0000cf;font-weight:700>0</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span>MARKEDONLY<span style=color:#ce5c00;font-weight:700>(</span>TRUE<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span>DELETEALL<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>END</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></code></pre></div><p>The final part of this example is an object that calls the functions above. In this example we will use a Page with a PingPong Timer Control to do the polling in (almost) real time. These are the functions on the page:</p>
|
||||
<div class=highlight><pre tabindex=0 style=background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-al data-lang=al>OnQueryClosePage<span style=color:#ce5c00;font-weight:700>(</span>CloseAction<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Action</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>None</span><span style=color:#ce5c00;font-weight:700>) </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Boolean</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline></span>ObserverMgt<span style=color:#ce5c00;font-weight:700>.</span>StopListening<span style=color:#ce5c00;font-weight:700>(</span><span style=color:#204a87;font-weight:700>DATABASE</span><span style=color:#000;font-weight:700>::</span>"NAV Whiteboard Booking"<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline></span>Timer<span style=color:#000;font-weight:700>::</span>AddInReady<span style=color:#ce5c00;font-weight:700>()
|
||||
</span><span style=color:#ce5c00;font-weight:700></span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>ObserverMgt<span style=color:#ce5c00;font-weight:700>.</span>Listen<span style=color:#ce5c00;font-weight:700>(</span><span style=color:#204a87;font-weight:700>DATABASE</span><span style=color:#000;font-weight:700>::</span>"NAV Whiteboard Booking"<span style=color:#ce5c00;font-weight:700>) </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline></span>CurrPage<span style=color:#ce5c00;font-weight:700>.</span>Timer<span style=color:#ce5c00;font-weight:700>.</span>Ping<span style=color:#ce5c00;font-weight:700>(</span><span style=color:#0000cf;font-weight:700>1000</span><span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline></span>Timer<span style=color:#000;font-weight:700>::</span>Pong<span style=color:#ce5c00;font-weight:700>()
|
||||
</span><span style=color:#ce5c00;font-weight:700></span>CallUpdate<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline></span>CurrPage<span style=color:#ce5c00;font-weight:700>.</span>Timer<span style=color:#ce5c00;font-weight:700>.</span>Ping<span style=color:#ce5c00;font-weight:700>(</span><span style=color:#0000cf;font-weight:700>1000</span><span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>LOCAL</span><span style=color:#f8f8f8;text-decoration:underline> </span>CallUpdate<span style=color:#ce5c00;font-weight:700>()
|
||||
</span><span style=color:#ce5c00;font-weight:700></span>ObserverMgt<span style=color:#ce5c00;font-weight:700>.</span>Poll<span style=color:#ce5c00;font-weight:700>(</span><span style=color:#204a87;font-weight:700>DATABASE</span><span style=color:#000;font-weight:700>::</span>"NAV Whiteboard Booking"<span style=color:#000;font-weight:700>,</span>TempChangeNotification<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>WITH</span><span style=color:#f8f8f8;text-decoration:underline> </span>TempChangeNotification<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>DO</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>BEGIN</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>FINDSET<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>REPEAT</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>"Type of Change"<span style=color:#f8f8f8;text-decoration:underline> </span>=<span style=color:#f8f8f8;text-decoration:underline> </span>"Type of Change"<span style=color:#000;font-weight:700>::</span>Delete<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>BEGIN</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#ce5c00;font-weight:700>...
|
||||
</span><span style=color:#ce5c00;font-weight:700> </span><span style=color:#204a87;font-weight:700>END</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>ELSE</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>RecRef<span style=color:#ce5c00;font-weight:700>.</span>GET<span style=color:#ce5c00;font-weight:700>(</span>"Record ID"<span style=color:#ce5c00;font-weight:700>) </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>BEGIN</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#ce5c00;font-weight:700>...
|
||||
</span><span style=color:#ce5c00;font-weight:700> </span><span style=color:#204a87;font-weight:700>END</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>UNTIL</span><span style=color:#f8f8f8;text-decoration:underline> </span>NEXT<span style=color:#f8f8f8;text-decoration:underline> </span>=<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#0000cf;font-weight:700>0</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>END</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></code></pre></div><h2 id=consequences>Consequences</h2>
|
||||
<p>The PingPong control is only available on the Windows Client, so if you want to use another client you will need to use another solution to Poll for Messages. Therefore this pattern is not always going to be “real time”.</p>
|
||||
<h2 id=related-topics>Related Topics</h2>
|
||||
<p>This pattern was originally described in the following blog:</p>
|
||||
<p><a href=https://geeknikolai.wordpress.com/2015/10/30/pubsub-pattern-in-dynamics-nav-2016/>https://geeknikolai.wordpress.com/2015/10/30/pubsub-pattern-in-dynamics-nav-2016/</a></p>
|
||||
<p>Below is the Wikipedia link to the PubSub pattern</p>
|
||||
<p><a href=https://en.wikipedia.org/wiki/Publish%E2%80%93subscribe_pattern>https://en.wikipedia.org/wiki/Publish%E2%80%93subscribe_pattern</a></p>
|
||||
<div class="text-muted mt-5 pt-3 border-top">
|
||||
<td>“Table ID”</td><td>Integer</td><td>“Observable Table”</td></tr><tr>
|
||||
<td>“Server ID”</td><td>Integer</td><td></td></tr><tr>
|
||||
<td>“Session ID”</td><td>Integer</td><td></td></tr><tr>
|
||||
<td>“Entry No.”</td><td>Integer</td><td>AutoIncrement</td></tr><tr>
|
||||
<td>“Type of Change”</td><td>Option</td><td>Insert,Modify,Delete,Rename</td></tr><tr>
|
||||
<td>“Record ID”</td><td>RecordID</td><td></td></tr><tr>
|
||||
<td>… (other fields to indicate what has changed)</td><td></td><td></td></tr></tbody></table><p>The Change Observer table identifies the Subscriber using Server ID and Session ID, and then in this example there is only one filter, which is the Table ID we want to listen to any changes. In this case all three fields are in the Primary Key.</p><p>The Change Notification table then has the same three fields plus an Entry No. as its Primary Key, and in this example borrows heavily from the Change Log code to fill in the rest of the message.</p><p><em><strong>Note:</strong></em> Other examples of the pattern could have very different fields to identify the Subscriber, Filters and then whatever fields needed for content of the Message.</p><p>Our Message Broker Codeunit will also serve as a central place to create Subscribers (Listen and StopListening functions) and a place to Poll for Messages. Note that the Poll function deletes the Messages as it reads them.</p><div class=highlight><pre tabindex=0 style=background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-al data-lang=al><span style=display:flex><span>Listen<span style=color:#ce5c00;font-weight:700>(</span>TableID<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Integer</span><span style=color:#ce5c00;font-weight:700>)
|
||||
</span></span></span><span style=display:flex><span><span style=color:#ce5c00;font-weight:700></span><span style=color:#204a87;font-weight:700>WITH</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observer<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>DO</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>BEGIN</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>"Table ID"<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#ce5c00;font-weight:700>:=</span><span style=color:#f8f8f8;text-decoration:underline> </span>TableID<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>"Server ID"<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#ce5c00;font-weight:700>:=</span><span style=color:#f8f8f8;text-decoration:underline> </span>SERVICEINSTANCEID<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>"Session ID"<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#ce5c00;font-weight:700>:=</span><span style=color:#f8f8f8;text-decoration:underline> </span>SESSIONID<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>INSERT<span style=color:#ce5c00;font-weight:700>(</span>TRUE<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>COMMIT<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>END</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span>StopListening<span style=color:#ce5c00;font-weight:700>(</span>TableID<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Integer</span><span style=color:#ce5c00;font-weight:700>)
|
||||
</span></span></span><span style=display:flex><span><span style=color:#ce5c00;font-weight:700></span><span style=color:#204a87;font-weight:700>WITH</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observer<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>DO</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>BEGIN</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>RESET<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>SETRANGE<span style=color:#ce5c00;font-weight:700>(</span>"Server ID"<span style=color:#000;font-weight:700>,</span>SERVICEINSTANCEID<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>SETRANGE<span style=color:#ce5c00;font-weight:700>(</span>"Session ID"<span style=color:#000;font-weight:700>,</span>SESSIONID<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>SETRANGE<span style=color:#ce5c00;font-weight:700>(</span>"Table ID"<span style=color:#000;font-weight:700>,</span>TableID<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>DELETEALL<span style=color:#ce5c00;font-weight:700>(</span>TRUE<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>COMMIT<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>END</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span>NotifyAll<span style=color:#ce5c00;font-weight:700>(</span>ChangeNotification<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Record</span><span style=color:#f8f8f8;text-decoration:underline> </span>"Change Notification"<span style=color:#ce5c00;font-weight:700>)
|
||||
</span></span></span><span style=display:flex><span><span style=color:#ce5c00;font-weight:700></span><span style=color:#204a87;font-weight:700>WITH</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observer<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>DO</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>BEGIN</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>RESET<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>SETRANGE<span style=color:#ce5c00;font-weight:700>(</span>"Table ID"<span style=color:#000;font-weight:700>,</span>ChangeNotification<span style=color:#ce5c00;font-weight:700>.</span>"Table ID"<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>FINDSET<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>REPEAT</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>Notify<span style=color:#ce5c00;font-weight:700>(</span>Observer<span style=color:#000;font-weight:700>,</span>ChangeNotification<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>UNTIL</span><span style=color:#f8f8f8;text-decoration:underline> </span>NEXT<span style=color:#f8f8f8;text-decoration:underline> </span>=<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#0000cf;font-weight:700>0</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>END</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span>Notify<span style=color:#ce5c00;font-weight:700>(</span>Observer<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Record</span><span style=color:#f8f8f8;text-decoration:underline> </span>"Change Observer"<span style=color:#000;font-weight:700>;</span>ChangeNotification<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Record</span><span style=color:#f8f8f8;text-decoration:underline> </span>"Change Notification"<span style=color:#ce5c00;font-weight:700>)
|
||||
</span></span></span><span style=display:flex><span><span style=color:#ce5c00;font-weight:700></span><span style=color:#204a87;font-weight:700>WITH</span><span style=color:#f8f8f8;text-decoration:underline> </span>ChangeNotification<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>DO</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>BEGIN</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>"Server ID"<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#ce5c00;font-weight:700>:=</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observer<span style=color:#ce5c00;font-weight:700>.</span>"Server ID"<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>"Session ID"<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#ce5c00;font-weight:700>:=</span><span style=color:#f8f8f8;text-decoration:underline> </span>Observer<span style=color:#ce5c00;font-weight:700>.</span>"Session ID"<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>"Entry No."<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#ce5c00;font-weight:700>:=</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#0000cf;font-weight:700>0</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>INSERT<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>END</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span>Poll<span style=color:#ce5c00;font-weight:700>(</span>TableID<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Integer</span><span style=color:#000;font-weight:700>;</span><span style=color:#204a87;font-weight:700>VAR</span><span style=color:#f8f8f8;text-decoration:underline> </span>TempChangeNotification<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>TEMPORARY</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Record</span><span style=color:#f8f8f8;text-decoration:underline> </span>"Change Notification"<span style=color:#ce5c00;font-weight:700>)
|
||||
</span></span></span><span style=display:flex><span><span style=color:#ce5c00;font-weight:700></span><span style=color:#204a87;font-weight:700>WITH</span><span style=color:#f8f8f8;text-decoration:underline> </span>ChangeNotification<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>DO</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>BEGIN</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>TempChangeNotification<span style=color:#ce5c00;font-weight:700>.</span>RESET<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>TempChangeNotification<span style=color:#ce5c00;font-weight:700>.</span>DELETEALL<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>RESET<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>SETRANGE<span style=color:#ce5c00;font-weight:700>(</span>"Table ID"<span style=color:#000;font-weight:700>,</span>TableID<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>SETRANGE<span style=color:#ce5c00;font-weight:700>(</span>"Server ID"<span style=color:#000;font-weight:700>,</span>SERVICEINSTANCEID<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>SETRANGE<span style=color:#ce5c00;font-weight:700>(</span>"Session ID"<span style=color:#000;font-weight:700>,</span>SESSIONID<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>FINDSET<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>REPEAT</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>TempChangeNotification<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#ce5c00;font-weight:700>:=</span><span style=color:#f8f8f8;text-decoration:underline> </span>ChangeNotification<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>TempChangeNotification<span style=color:#ce5c00;font-weight:700>.</span>INSERT<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>MARK<span style=color:#ce5c00;font-weight:700>(</span>TRUE<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>UNTIL</span><span style=color:#f8f8f8;text-decoration:underline> </span>NEXT<span style=color:#f8f8f8;text-decoration:underline> </span>=<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#0000cf;font-weight:700>0</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>MARKEDONLY<span style=color:#ce5c00;font-weight:700>(</span>TRUE<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span>DELETEALL<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>END</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span></code></pre></div><p>The final part of this example is an object that calls the functions above. In this example we will use a Page with a PingPong Timer Control to do the polling in (almost) real time. These are the functions on the page:</p><div class=highlight><pre tabindex=0 style=background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-al data-lang=al><span style=display:flex><span>OnQueryClosePage<span style=color:#ce5c00;font-weight:700>(</span>CloseAction<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Action</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>None</span><span style=color:#ce5c00;font-weight:700>) </span><span style=color:#000;font-weight:700>:</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>Boolean</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span>ObserverMgt<span style=color:#ce5c00;font-weight:700>.</span>StopListening<span style=color:#ce5c00;font-weight:700>(</span><span style=color:#204a87;font-weight:700>DATABASE</span><span style=color:#000;font-weight:700>::</span>"NAV Whiteboard Booking"<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span>Timer<span style=color:#000;font-weight:700>::</span>AddInReady<span style=color:#ce5c00;font-weight:700>()
|
||||
</span></span></span><span style=display:flex><span><span style=color:#ce5c00;font-weight:700></span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>ObserverMgt<span style=color:#ce5c00;font-weight:700>.</span>Listen<span style=color:#ce5c00;font-weight:700>(</span><span style=color:#204a87;font-weight:700>DATABASE</span><span style=color:#000;font-weight:700>::</span>"NAV Whiteboard Booking"<span style=color:#ce5c00;font-weight:700>) </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span>CurrPage<span style=color:#ce5c00;font-weight:700>.</span>Timer<span style=color:#ce5c00;font-weight:700>.</span>Ping<span style=color:#ce5c00;font-weight:700>(</span><span style=color:#0000cf;font-weight:700>1000</span><span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span>Timer<span style=color:#000;font-weight:700>::</span>Pong<span style=color:#ce5c00;font-weight:700>()
|
||||
</span></span></span><span style=display:flex><span><span style=color:#ce5c00;font-weight:700></span>CallUpdate<span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span>CurrPage<span style=color:#ce5c00;font-weight:700>.</span>Timer<span style=color:#ce5c00;font-weight:700>.</span>Ping<span style=color:#ce5c00;font-weight:700>(</span><span style=color:#0000cf;font-weight:700>1000</span><span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>LOCAL</span><span style=color:#f8f8f8;text-decoration:underline> </span>CallUpdate<span style=color:#ce5c00;font-weight:700>()
|
||||
</span></span></span><span style=display:flex><span><span style=color:#ce5c00;font-weight:700></span>ObserverMgt<span style=color:#ce5c00;font-weight:700>.</span>Poll<span style=color:#ce5c00;font-weight:700>(</span><span style=color:#204a87;font-weight:700>DATABASE</span><span style=color:#000;font-weight:700>::</span>"NAV Whiteboard Booking"<span style=color:#000;font-weight:700>,</span>TempChangeNotification<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>WITH</span><span style=color:#f8f8f8;text-decoration:underline> </span>TempChangeNotification<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>DO</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>BEGIN</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>FINDSET<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>REPEAT</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>"Type of Change"<span style=color:#f8f8f8;text-decoration:underline> </span>=<span style=color:#f8f8f8;text-decoration:underline> </span>"Type of Change"<span style=color:#000;font-weight:700>::</span>Delete<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>BEGIN</span><span style=color:#f8f8f8;text-decoration:underline>
|
||||
</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#ce5c00;font-weight:700>...
|
||||
</span></span></span><span style=display:flex><span><span style=color:#ce5c00;font-weight:700> </span><span style=color:#204a87;font-weight:700>END</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>ELSE</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>IF</span><span style=color:#f8f8f8;text-decoration:underline> </span>RecRef<span style=color:#ce5c00;font-weight:700>.</span>GET<span style=color:#ce5c00;font-weight:700>(</span>"Record ID"<span style=color:#ce5c00;font-weight:700>) </span><span style=color:#204a87;font-weight:700>THEN</span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>BEGIN</span><span style=color:#f8f8f8;text-decoration:underline>
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</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#ce5c00;font-weight:700>...
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</span></span></span><span style=display:flex><span><span style=color:#ce5c00;font-weight:700> </span><span style=color:#204a87;font-weight:700>END</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
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</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>UNTIL</span><span style=color:#f8f8f8;text-decoration:underline> </span>NEXT<span style=color:#f8f8f8;text-decoration:underline> </span>=<span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#0000cf;font-weight:700>0</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
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</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>END</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
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</span></span></span></code></pre></div><h2 id=consequences>Consequences</h2><p>The PingPong control is only available on the Windows Client, so if you want to use another client you will need to use another solution to Poll for Messages. Therefore this pattern is not always going to be “real time”.</p><h2 id=related-topics>Related Topics</h2><p>This pattern was originally described in the following blog:</p><p><a href=https://geeknikolai.wordpress.com/2015/10/30/pubsub-pattern-in-dynamics-nav-2016/>https://geeknikolai.wordpress.com/2015/10/30/pubsub-pattern-in-dynamics-nav-2016/</a></p><p>Below is the Wikipedia link to the PubSub pattern</p><p><a href=https://en.wikipedia.org/wiki/Publish%E2%80%93subscribe_pattern>https://en.wikipedia.org/wiki/Publish%E2%80%93subscribe_pattern</a></p><div class="text-muted mt-5 pt-3 border-top">
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Last modified February 24, 2022: <a href=https://github.com/microsoft/alguidelines/commit/5ee0436639455a35835c5ce88241d3fad662ee06>Added tags & categories + cleanup (5ee04366)</a>
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