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<link rel=alternate type=application/rss+xml href=/navpatterns/1-patterns/singleton/index.xml title="AL Guidelines">
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<title>Singleton :: AL Guidelines</title>
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<li><strong>Lost reference to centralizer:</strong> An instance of a relevant object could attempt to centralize control or data in the system. However, once this object is no longer in scope, the reference to it is lost and cannot be retrieved for later coordination</li>
<li><strong>Cannot rebuild the initial state:</strong> A new instance of the same object could be created, however the last known state of the lost instance cannot be known anymore.</li>
</ul>
<p><strong>Solution:</strong> create an object which resides in memory in a single copy (instance). Have a way to retrieve this unique object from code. This object can either be a <a href=/nav/w/designpatterns/151.singleton-table><strong>Singleton Table</strong></a>, or a <a href=/nav/w/designpatterns/283.singleton-codeunit><strong>Singleton Codeunit</strong></a>.</p>
<p><strong>Solution:</strong> create an object which resides in memory in a single copy (instance). Have a way to retrieve this unique object from code. This object can either be a <a href=/navpatterns/1-patterns/singleton/singleton-table/><strong>Singleton Table</strong></a>, or a <a href=/navpatterns/1-patterns/singleton/singleton-codeunit/><strong>Singleton Codeunit</strong></a>.</p>
<p>The implementation varies depending on the technology and language used. In object-oriented (OO) languages like C#, C++ or Java, the <strong>Singleton</strong> uses static classes and class members to instantiate. There is a mechanism to ensure only one instance of the object can exist. This mechanism is many times explicit (like in OO languages) and sometimes implicit as part of the compiler or platform (as it is in NAV).</p>
<p><strong>Benefits:</strong></p>
<ul>
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