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<ul class=topics>
<li data-nav-id=/welcome/ title=Welcome class=dd-item><a href=/welcome/><b><i class="fas fa-home"></i> </b>Welcome</a><ul></ul></li>
<li data-nav-id=/bcpatterns/ title="BC Patterns" class="dd-item parent"><a href=/bcpatterns/><b><i class="fas fa-clone"></i> </b>BC Patterns</a><ul>
<li data-nav-id=/bcpatterns/event-bridge-pattern/ title="Event Bridge Pattern" class="dd-item active"><a href=/bcpatterns/event-bridge-pattern/>Event Bridge Pattern</a></li>
<li data-nav-id=/bcpatterns/facade-pattern/ title="Facade Pattern" class=dd-item><a href=/bcpatterns/facade-pattern/>Facade Pattern</a></li>
<li data-nav-id=/bcpatterns/generic-method-pattern/ title="Generic Method Pattern" class=dd-item><a href=/bcpatterns/generic-method-pattern/>Generic Method Pattern</a></li></ul></li>
<li data-nav-id=/bcbestpractices/ title="BC Dev. Best Practices" class=dd-item><a href=/bcbestpractices/><b><i class="fas fa-medal"></i> </b>BC Dev. Best Practices</a><ul>
<li data-nav-id=/bcbestpractices/performance/ title=Performance class=dd-item><a href=/bcbestpractices/performance/>Performance</a><ul>
<li data-nav-id=/bcbestpractices/performance/deleteall/ title=DeleteAll class=dd-item><a href=/bcbestpractices/performance/deleteall/>DeleteAll</a></li>
<li data-nav-id=/bcbestpractices/performance/subscribercodeunits/ title="Subscriber Codeunits" class=dd-item><a href=/bcbestpractices/performance/subscribercodeunits/>Subscriber Codeunits</a></li></ul></li>
<li data-nav-id=/bcbestpractices/readability/ title=Readability class=dd-item><a href=/bcbestpractices/readability/>Readability</a><ul>
<li data-nav-id=/bcbestpractices/readability/begin-as-an-afterword/ title="begin as an 'After Word'" class=dd-item><a href=/bcbestpractices/readability/begin-as-an-afterword/>begin as an 'After Word'</a></li>
<li data-nav-id=/bcbestpractices/readability/begin-end/ title="Begin-End - Compound Only" class=dd-item><a href=/bcbestpractices/readability/begin-end/>Begin-End - Compound Only</a></li>
<li data-nav-id=/bcbestpractices/readability/binary-operator-line-start/ title="Binary Operator to Start Line" class=dd-item><a href=/bcbestpractices/readability/binary-operator-line-start/>Binary Operator to Start Line</a></li>
<li data-nav-id=/bcbestpractices/readability/case-actions/ title="CASE Action on next line" class=dd-item><a href=/bcbestpractices/readability/case-actions/>CASE Action on next line</a></li>
<li data-nav-id=/bcbestpractices/readability/comments-spacing/ title="Comment Spacing" class=dd-item><a href=/bcbestpractices/readability/comments-spacing/>Comment Spacing</a></li>
<li data-nav-id=/bcbestpractices/readability/end-else-pair/ title="end else pair" class=dd-item><a href=/bcbestpractices/readability/end-else-pair/>end else pair</a></li>
<li data-nav-id=/bcbestpractices/readability/keyword-pairs-indentation/ title="Keyword Pairs - Indentation" class=dd-item><a href=/bcbestpractices/readability/keyword-pairs-indentation/>Keyword Pairs - Indentation</a></li>
<li data-nav-id=/bcbestpractices/readability/line-start-keywords/ title="Line Start Keywords" class=dd-item><a href=/bcbestpractices/readability/line-start-keywords/>Line Start Keywords</a></li>
<li data-nav-id=/bcbestpractices/readability/lonely-repeat/ title="Lonely Repeat" class=dd-item><a href=/bcbestpractices/readability/lonely-repeat/>Lonely Repeat</a></li>
<li data-nav-id=/bcbestpractices/readability/named-invocations/ title="Named Invocations" class=dd-item><a href=/bcbestpractices/readability/named-invocations/>Named Invocations</a></li>
<li data-nav-id=/bcbestpractices/readability/one-statement-per-line/ title="One Statement Per Line" class=dd-item><a href=/bcbestpractices/readability/one-statement-per-line/>One Statement Per Line</a></li>
<li data-nav-id=/bcbestpractices/readability/separate-if-and-else/ title="Separate if and else" class=dd-item><a href=/bcbestpractices/readability/separate-if-and-else/>Separate if and else</a></li>
<li data-nav-id=/bcbestpractices/readability/spacing-binary-operators/ title="Spacing Binary Operators" class=dd-item><a href=/bcbestpractices/readability/spacing-binary-operators/>Spacing Binary Operators</a></li>
<li data-nav-id=/bcbestpractices/readability/suggested-abbreviations/ title="Suggested Abbreviations" class=dd-item><a href=/bcbestpractices/readability/suggested-abbreviations/>Suggested Abbreviations</a></li>
<li data-nav-id=/bcbestpractices/readability/unnecessary-else/ title="Unnecessary 'else'" class=dd-item><a href=/bcbestpractices/readability/unnecessary-else/>Unnecessary 'else'</a></li>
<li data-nav-id=/bcbestpractices/readability/unnecessary-truefalse/ title="Unnecessary true/false" class=dd-item><a href=/bcbestpractices/readability/unnecessary-truefalse/>Unnecessary true/false</a></li>
<li data-nav-id=/bcbestpractices/readability/variable-naming/ title="Variable Naming" class=dd-item><a href=/bcbestpractices/readability/variable-naming/>Variable Naming</a></li>
<li data-nav-id=/bcbestpractices/readability/variables-declarations-order/ title="Variables Declarations Order" class=dd-item><a href=/bcbestpractices/readability/variables-declarations-order/>Variables Declarations Order</a></li></ul></li></ul></li>
<li data-nav-id=/navpatterns/ title="NAV Patterns Archive" class=dd-item><a href=/navpatterns/><b><i class="fas fa-save"></i> </b>NAV Patterns Archive</a><ul>
<li data-nav-id=/navpatterns/1-patterns/ title="1. Patterns" class=dd-item><a href=/navpatterns/1-patterns/>1. Patterns</a><ul>
<li data-nav-id=/navpatterns/1-patterns/activity-log/ title="Activity Logs" class=dd-item><a href=/navpatterns/1-patterns/activity-log/>Activity Logs</a></li>
<li data-nav-id=/navpatterns/1-patterns/argument-table/ title="Argument Table" class=dd-item><a href=/navpatterns/1-patterns/argument-table/>Argument Table</a></li>
<li data-nav-id=/navpatterns/1-patterns/blocked-entity/ title="Blocked Entity" class=dd-item><a href=/navpatterns/1-patterns/blocked-entity/>Blocked Entity</a><ul>
<li data-nav-id=/navpatterns/1-patterns/blocked-entity/data-driven-blocked-entity/ title="Data Driven Blocked Entity" class=dd-item><a href=/navpatterns/1-patterns/blocked-entity/data-driven-blocked-entity/>Data Driven Blocked Entity</a></li></ul></li>
<li data-nav-id=/navpatterns/1-patterns/cached-web-service-calls/ title="Cached Web Server Calls" class=dd-item><a href=/navpatterns/1-patterns/cached-web-service-calls/>Cached Web Server Calls</a></li>
<li data-nav-id=/navpatterns/1-patterns/conditional-cascading-update/ title="Conditional Cascading Update" class=dd-item><a href=/navpatterns/1-patterns/conditional-cascading-update/>Conditional Cascading Update</a></li>
<li data-nav-id=/navpatterns/1-patterns/copy-document/ title="Copy Document" class=dd-item><a href=/navpatterns/1-patterns/copy-document/>Copy Document</a></li>
<li data-nav-id=/navpatterns/1-patterns/create-data-from-templates/ title="Create Data from Templates" class=dd-item><a href=/navpatterns/1-patterns/create-data-from-templates/>Create Data from Templates</a></li>
<li data-nav-id=/navpatterns/1-patterns/create-urls-to-nav-clients/ title="Create URLs to NAV Clients" class=dd-item><a href=/navpatterns/1-patterns/create-urls-to-nav-clients/>Create URLs to NAV Clients</a></li>
<li data-nav-id=/navpatterns/1-patterns/creating-custom-charts/ title="Creating Custom Charts" class=dd-item><a href=/navpatterns/1-patterns/creating-custom-charts/>Creating Custom Charts</a></li>
<li data-nav-id=/navpatterns/1-patterns/cross-session-events/ title="Cross Session Events" class=dd-item><a href=/navpatterns/1-patterns/cross-session-events/>Cross Session Events</a></li>
<li data-nav-id=/navpatterns/1-patterns/currently-active-record/ title="Currently Active Record" class=dd-item><a href=/navpatterns/1-patterns/currently-active-record/>Currently Active Record</a></li>
<li data-nav-id=/navpatterns/1-patterns/data-migration-facade/ title="Data Migration Façade" class=dd-item><a href=/navpatterns/1-patterns/data-migration-facade/>Data Migration Façade</a></li>
<li data-nav-id=/navpatterns/1-patterns/discovery-event/ title="Discovery Event" class=dd-item><a href=/navpatterns/1-patterns/discovery-event/>Discovery Event</a></li>
<li data-nav-id=/navpatterns/1-patterns/document/ title=Document class=dd-item><a href=/navpatterns/1-patterns/document/>Document</a></li>
<li data-nav-id=/navpatterns/1-patterns/easy-update-of-setup-or-supplementary-information/ title="Easy Update Of Setup Or Supplementary Information" class=dd-item><a href=/navpatterns/1-patterns/easy-update-of-setup-or-supplementary-information/>Easy Update Of Setup Or Supplementary Information</a></li>
<li data-nav-id=/navpatterns/1-patterns/error-message-processing/ title="Error Message Processing" class=dd-item><a href=/navpatterns/1-patterns/error-message-processing/>Error Message Processing</a></li>
<li data-nav-id=/navpatterns/1-patterns/extending-the-role-center-headlines/ title="Extending the Role Center Headlines" class=dd-item><a href=/navpatterns/1-patterns/extending-the-role-center-headlines/>Extending the Role Center Headlines</a></li>
<li data-nav-id=/navpatterns/1-patterns/feature-localization-for-data-structures/ title="Feature Localization For Data Structures" class=dd-item><a href=/navpatterns/1-patterns/feature-localization-for-data-structures/>Feature Localization For Data Structures</a></li>
<li data-nav-id=/navpatterns/1-patterns/hooks/ title=Hooks class=dd-item><a href=/navpatterns/1-patterns/hooks/>Hooks</a></li>
<li data-nav-id=/navpatterns/1-patterns/implementation-of-surrogate-keys-using-autoincrement-pattern/ title="Surrogate keys using Autoincrement Pattern" class=dd-item><a href=/navpatterns/1-patterns/implementation-of-surrogate-keys-using-autoincrement-pattern/>Surrogate keys using Autoincrement Pattern</a></li>
<li data-nav-id=/navpatterns/1-patterns/instructions-in-the-ui/ title="Instructions in the UI" class=dd-item><a href=/navpatterns/1-patterns/instructions-in-the-ui/>Instructions in the UI</a></li>
<li data-nav-id=/navpatterns/1-patterns/integration-of-addresses/ title="Integration of Addresses" class=dd-item><a href=/navpatterns/1-patterns/integration-of-addresses/>Integration of Addresses</a></li>
<li data-nav-id=/navpatterns/1-patterns/journal-error-processing/ title="Journal Error Processing" class=dd-item><a href=/navpatterns/1-patterns/journal-error-processing/>Journal Error Processing</a></li>
<li data-nav-id=/navpatterns/1-patterns/journal-template-batch-line/ title="Journal Template Batch Line" class=dd-item><a href=/navpatterns/1-patterns/journal-template-batch-line/>Journal Template Batch Line</a></li>
<li data-nav-id=/navpatterns/1-patterns/master-data/ title="Master Data" class=dd-item><a href=/navpatterns/1-patterns/master-data/>Master Data</a></li>
<li data-nav-id=/navpatterns/1-patterns/multi-file-download/ title="Multi-file Download" class=dd-item><a href=/navpatterns/1-patterns/multi-file-download/>Multi-file Download</a></li>
<li data-nav-id=/navpatterns/1-patterns/multi-page-list/ title="Multi-Page List" class=dd-item><a href=/navpatterns/1-patterns/multi-page-list/>Multi-Page List</a></li>
<li data-nav-id=/navpatterns/1-patterns/multilanguage-application-data/ title="Multilanguage Application Data" class=dd-item><a href=/navpatterns/1-patterns/multilanguage-application-data/>Multilanguage Application Data</a></li>
<li data-nav-id=/navpatterns/1-patterns/net-exception-handling-in-cal/ title="NET Exception Handling in CAL" class=dd-item><a href=/navpatterns/1-patterns/net-exception-handling-in-cal/>NET Exception Handling in CAL</a><ul>
<li data-nav-id=/navpatterns/1-patterns/net-exception-handling-in-cal/tryfunction-net-exception-handling-in-cal/ title="TryFunction NET Exception Handling in CAL" class=dd-item><a href=/navpatterns/1-patterns/net-exception-handling-in-cal/tryfunction-net-exception-handling-in-cal/>TryFunction NET Exception Handling in CAL</a></li></ul></li>
<li data-nav-id=/navpatterns/1-patterns/no-series/ title="No Series" class=dd-item><a href=/navpatterns/1-patterns/no-series/>No Series</a></li>
<li data-nav-id=/navpatterns/1-patterns/notifications/ title=Notifications class=dd-item><a href=/navpatterns/1-patterns/notifications/>Notifications</a><ul>
<li data-nav-id=/navpatterns/1-patterns/notifications/in-context-notifications/ title="In-context Notifications" class=dd-item><a href=/navpatterns/1-patterns/notifications/in-context-notifications/>In-context Notifications</a></li>
<li data-nav-id=/navpatterns/1-patterns/notifications/notification-lifecycle-management-pattern/ title="Notification Lifecycle Management Pattern" class=dd-item><a href=/navpatterns/1-patterns/notifications/notification-lifecycle-management-pattern/>Notification Lifecycle Management Pattern</a></li></ul></li>
<li data-nav-id=/navpatterns/1-patterns/observer/ title=Observer class=dd-item><a href=/navpatterns/1-patterns/observer/>Observer</a></li>
<li data-nav-id=/navpatterns/1-patterns/posting-routine-select-behavior/ title="Posting Routine - Select Behavior" class=dd-item><a href=/navpatterns/1-patterns/posting-routine-select-behavior/>Posting Routine - Select Behavior</a></li>
<li data-nav-id=/navpatterns/1-patterns/product-name/ title="Product Name" class=dd-item><a href=/navpatterns/1-patterns/product-name/>Product Name</a></li>
<li data-nav-id=/navpatterns/1-patterns/queries/ title=Queries class=dd-item><a href=/navpatterns/1-patterns/queries/>Queries</a><ul>
<li data-nav-id=/navpatterns/1-patterns/queries/select-distinct-with-queries/ title="SELECT DISTINCT with Queries" class=dd-item><a href=/navpatterns/1-patterns/queries/select-distinct-with-queries/>SELECT DISTINCT with Queries</a></li>
<li data-nav-id=/navpatterns/1-patterns/queries/use-queries-to-detect-duplicate-records/ title="Use Queries to Detect Duplicate Records" class=dd-item><a href=/navpatterns/1-patterns/queries/use-queries-to-detect-duplicate-records/>Use Queries to Detect Duplicate Records</a></li>
<li data-nav-id=/navpatterns/1-patterns/queries/use-queries-to-replace-nested-loops/ title="Use Queries to Replace Nested Loops" class=dd-item><a href=/navpatterns/1-patterns/queries/use-queries-to-replace-nested-loops/>Use Queries to Replace Nested Loops</a></li></ul></li>
<li data-nav-id=/navpatterns/1-patterns/read-once-initialization-and-validation/ title="Read-once Initialization and Validation" class=dd-item><a href=/navpatterns/1-patterns/read-once-initialization-and-validation/>Read-once Initialization and Validation</a></li>
<li data-nav-id=/navpatterns/1-patterns/released-entity/ title="Released Entity" class=dd-item><a href=/navpatterns/1-patterns/released-entity/>Released Entity</a></li>
<li data-nav-id=/navpatterns/1-patterns/report-selection/ title="Report Selection" class=dd-item><a href=/navpatterns/1-patterns/report-selection/>Report Selection</a></li>
<li data-nav-id=/navpatterns/1-patterns/security/ title=Security class=dd-item><a href=/navpatterns/1-patterns/security/>Security</a><ul>
<li data-nav-id=/navpatterns/1-patterns/security/1-sensitive-data-encapsulation/ title="Sensitive Data Encapsulation" class=dd-item><a href=/navpatterns/1-patterns/security/1-sensitive-data-encapsulation/>Sensitive Data Encapsulation</a></li>
<li data-nav-id=/navpatterns/1-patterns/security/2-data-encryption/ title="Data Encryption" class=dd-item><a href=/navpatterns/1-patterns/security/2-data-encryption/>Data Encryption</a></li>
<li data-nav-id=/navpatterns/1-patterns/security/3-single-point-of-access/ title="Single Point of Access" class=dd-item><a href=/navpatterns/1-patterns/security/3-single-point-of-access/>Single Point of Access</a></li>
<li data-nav-id=/navpatterns/1-patterns/security/4-masked-text/ title="Masked Text" class=dd-item><a href=/navpatterns/1-patterns/security/4-masked-text/>Masked Text</a></li>
<li data-nav-id=/navpatterns/1-patterns/security/5-ssl-in-nav/ title="SSL in NAV" class=dd-item><a href=/navpatterns/1-patterns/security/5-ssl-in-nav/>SSL in NAV</a></li></ul></li>
<li data-nav-id=/navpatterns/1-patterns/setup-specificity-fallback/ title="Setup Specificity Fallback" class=dd-item><a href=/navpatterns/1-patterns/setup-specificity-fallback/>Setup Specificity Fallback</a></li>
<li data-nav-id=/navpatterns/1-patterns/silent-file-upload-and-download/ title="Silent File Upload and Download" class=dd-item><a href=/navpatterns/1-patterns/silent-file-upload-and-download/>Silent File Upload and Download</a></li>
<li data-nav-id=/navpatterns/1-patterns/singleton/ title=Singleton class=dd-item><a href=/navpatterns/1-patterns/singleton/>Singleton</a><ul>
<li data-nav-id=/navpatterns/1-patterns/singleton/singleton-codeunit/ title="Singleton Codeunit" class=dd-item><a href=/navpatterns/1-patterns/singleton/singleton-codeunit/>Singleton Codeunit</a></li>
<li data-nav-id=/navpatterns/1-patterns/singleton/singleton-table/ title="Singleton Table" class=dd-item><a href=/navpatterns/1-patterns/singleton/singleton-table/>Singleton Table</a><ul>
<li data-nav-id=/navpatterns/1-patterns/singleton/singleton-table/cue-table/ title="Cue Table" class=dd-item><a href=/navpatterns/1-patterns/singleton/singleton-table/cue-table/>Cue Table</a></li>
<li data-nav-id=/navpatterns/1-patterns/singleton/singleton-table/setup-table/ title="Setup Table" class=dd-item><a href=/navpatterns/1-patterns/singleton/singleton-table/setup-table/>Setup Table</a></li></ul></li></ul></li>
<li data-nav-id=/navpatterns/1-patterns/standard-journal/ title="Standard Journal" class=dd-item><a href=/navpatterns/1-patterns/standard-journal/>Standard Journal</a></li>
<li data-nav-id=/navpatterns/1-patterns/temporary-dataset-report/ title="Temporary Dataset Report" class=dd-item><a href=/navpatterns/1-patterns/temporary-dataset-report/>Temporary Dataset Report</a></li>
<li data-nav-id=/navpatterns/1-patterns/totals-and-discounts-on-subpages-sales-and-purchases/ title="Totals and Discounts on Subpages Sales and Purchases" class=dd-item><a href=/navpatterns/1-patterns/totals-and-discounts-on-subpages-sales-and-purchases/>Totals and Discounts on Subpages Sales and Purchases</a></li>
<li data-nav-id=/navpatterns/1-patterns/transfer-custom-fields/ title="Transfer Custom Fields" class=dd-item><a href=/navpatterns/1-patterns/transfer-custom-fields/>Transfer Custom Fields</a></li>
<li data-nav-id=/navpatterns/1-patterns/variant-facade/ title="Variant Facade" class=dd-item><a href=/navpatterns/1-patterns/variant-facade/>Variant Facade</a></li></ul></li>
<li data-nav-id=/navpatterns/2-anti-patterns/ title="2. Anti-Patterns" class=dd-item><a href=/navpatterns/2-anti-patterns/>2. Anti-Patterns</a><ul>
<li data-nav-id=/navpatterns/2-anti-patterns/nav-upgrade/ title="Nav Upgrade" class=dd-item><a href=/navpatterns/2-anti-patterns/nav-upgrade/>Nav Upgrade</a></li>
<li data-nav-id=/navpatterns/2-anti-patterns/reusable-bugs/ title="Reusable Bugs" class=dd-item><a href=/navpatterns/2-anti-patterns/reusable-bugs/>Reusable Bugs</a></li></ul></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/ title="3. CAL Coding Guidelines" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/>3. CAL Coding Guidelines</a><ul>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/ title=Design class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/>Design</a><ul>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/by-reference-parameters/ title="By Reference Parameters" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/by-reference-parameters/>By Reference Parameters</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/class-coupling/ title="Class Coupling" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/class-coupling/>Class Coupling</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/cyclomatic-complexity/ title="Cyclomatic Complexity" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/cyclomatic-complexity/>Cyclomatic Complexity</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/encapsulate-local-functionality/ title="Encapsulate Local Functionality" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/encapsulate-local-functionality/>Encapsulate Local Functionality</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/findset-findfirst-findlast/ title="FINDSET FINDFIRST FINDLAST" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/findset-findfirst-findlast/>FINDSET FINDFIRST FINDLAST</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/initialized-variables/ title="Initialized Variables" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/initialized-variables/>Initialized Variables</a></li>
<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/maintainability-index/ title="Maintainability Index" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/maintainability-index/>Maintainability Index</a></li>
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<h1>Event Bridge Pattern</h1>
<p>&lt;<em>Created by waldo & Arend-Jan Kauffmann, Described by waldo</em>></p>
<h2 id=abstract>Abstract</h2>
<p>In the world of interfaces, it is important to preserve (certain) events over multiple implementation of the interface.</p>
<h2 id=context>Context</h2>
<p>An app can have interfaces.
It makes it possible for other apps to extend/change the implementations of a certain part of the business logic.</p>
<p>Like in this example, we have an interface, to implement different ways for getting weights from scales:</p>
<div class=highlight><pre tabindex=0 style=color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-AL data-lang=AL><span style=color:#66d9ef>interface</span> &#34;IScale&#34;
{
<span style=color:#66d9ef>procedure</span> GetWeight<span style=color:#f92672>()</span>: <span style=color:#66d9ef>Decimal</span>;
<span style=color:#66d9ef>procedure</span> Tare<span style=color:#f92672>()</span>;
}
</code></pre></div><h2 id=problem>Problem</h2>
<p>Multiple apps can subscribe to certain events of the app.
When a new implementation is created, we need to make sure that these events are raised at the right times. If those events were published on the implementation codeunit, it might very well be that those events will not be raised, hard to find, or whatever.</p>
<p>So, if we would implement it like this, it isn&rsquo;t really extensible, as a different implemention would implement different events .. and it&rsquo;s not possible to subscribe to all of them (including future implementations)</p>
<div class=highlight><pre tabindex=0 style=color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-AL data-lang=AL><span style=color:#66d9ef>codeunit</span> <span style=color:#ae81ff>50407</span> &#34;Scale Wrong&#34; <span style=color:#66d9ef>implements</span> IScale
{
<span style=color:#66d9ef>procedure</span> GetWeight<span style=color:#f92672>() </span>Result: <span style=color:#66d9ef>Decimal</span>;
<span style=color:#66d9ef>begin</span>
<span style=color:#75715e>//TODO: Implement Bar GetWeight
</span><span style=color:#75715e></span> OnAfterGetWeight<span style=color:#f92672>(</span>Result<span style=color:#f92672>)</span>;
<span style=color:#66d9ef>end</span>;
<span style=color:#66d9ef>procedure</span> Tare<span style=color:#f92672>()</span>;
<span style=color:#66d9ef>begin</span>
<span style=color:#75715e>//TODO: Implement Bar Tare
</span><span style=color:#75715e></span> OnAfterTare<span style=color:#f92672>()</span>;
<span style=color:#66d9ef>end</span>;
[IntegrationEvent<span style=color:#f92672>(</span>false, false<span style=color:#f92672>)</span>]
<span style=color:#66d9ef>procedure</span> OnAfterGetWeight<span style=color:#f92672>(</span><span style=color:#66d9ef>var</span> Result: <span style=color:#66d9ef>Decimal</span><span style=color:#f92672>)
</span><span style=color:#f92672> </span><span style=color:#66d9ef>begin</span>
<span style=color:#66d9ef>end</span>;
[IntegrationEvent<span style=color:#f92672>(</span>false, false<span style=color:#f92672>)</span>]
<span style=color:#66d9ef>procedure</span> OnAfterTare<span style=color:#f92672>()
</span><span style=color:#f92672> </span><span style=color:#66d9ef>begin</span>
<span style=color:#66d9ef>end</span>;
}
</code></pre></div><h2 id=description>Description</h2>
<p>To mitigate this problem, we can work with a new, dedicated and isolated codeunit, with publisher events to be able to raise them from different places.</p>
<div class=highlight><pre tabindex=0 style=color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-AL data-lang=AL><span style=color:#66d9ef>codeunit</span> <span style=color:#ae81ff>50406</span> &#34;IScale Triggers&#34;
{
[IntegrationEvent<span style=color:#f92672>(</span>false, false<span style=color:#f92672>)</span>]
<span style=color:#66d9ef>procedure</span> OnAfterGetWeight<span style=color:#f92672>(</span><span style=color:#66d9ef>var</span> Result: <span style=color:#66d9ef>Decimal</span><span style=color:#f92672>)
</span><span style=color:#f92672> </span><span style=color:#66d9ef>begin</span>
<span style=color:#66d9ef>end</span>;
[IntegrationEvent<span style=color:#f92672>(</span>false, false<span style=color:#f92672>)</span>]
<span style=color:#66d9ef>procedure</span> OnAfterTare<span style=color:#f92672>()
</span><span style=color:#f92672> </span><span style=color:#66d9ef>begin</span>
<span style=color:#66d9ef>end</span>;
}
</code></pre></div><p>This way, it&rsquo;s possible to raise the events in all the implementations:</p>
<div class=highlight><pre tabindex=0 style=color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-AL data-lang=AL><span style=color:#66d9ef>codeunit</span> <span style=color:#ae81ff>50405</span> &#34;Scale Bar&#34; <span style=color:#66d9ef>implements</span> IScale
{
<span style=color:#66d9ef>var</span>
IScaleTriggers: <span style=color:#66d9ef>Codeunit</span> &#34;IScale Triggers&#34;;
<span style=color:#66d9ef>procedure</span> GetWeight<span style=color:#f92672>() </span>Result: <span style=color:#66d9ef>Decimal</span>;
<span style=color:#66d9ef>begin</span>
<span style=color:#75715e>//TODO: Implement Bar GetWeight
</span><span style=color:#75715e></span> IScaleTriggers<span style=color:#f92672>.</span>OnAfterGetWeight<span style=color:#f92672>(</span>Result<span style=color:#f92672>)</span>;
<span style=color:#66d9ef>end</span>;
<span style=color:#66d9ef>procedure</span> Tare<span style=color:#f92672>()</span>;
<span style=color:#66d9ef>begin</span>
<span style=color:#75715e>//TODO: Implement Bar Tare
</span><span style=color:#75715e></span> IScaleTriggers<span style=color:#f92672>.</span>OnAfterTare<span style=color:#f92672>()</span>;
<span style=color:#66d9ef>end</span>;
}
</code></pre></div><h2 id=benefits>Benefits</h2>
<p>This new codeunit, with public events, makes the events accessible from all places, including new apps that are dependent from this app, and wants to extend the</p>
<p>The naming convention (both starting with &ldquo;IScale&rdquo;) also makes it very easy to find that corresponding events for the interface.</p>
<h2 id=when-not-to-use>When not to use</h2>
<p>Obviously, the events should be carefully considered: only the events that make sense to &ldquo;share&rdquo; over all implementations, need this approach.</p>
<h2 id=discussions>Discussions</h2>
<p>You can discuss this pattern <a href=https://github.com/microsoft/alguidelines/discussions/66>here</a></p>
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