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<title>Apache Qpid : Qpid Design - Application Registry</title>
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Apache Qpid : Qpid Design - Application Registry
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This page last changed on Oct 19, 2006 by <font color="#0050B2">rgreig</font>.
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<p>The Application Registry is a more sophisticated version of the widely used singleton pattern. It allows the registration of services with a central component that manages the lifecycle of those services.</p>
<h4><a name="QpidDesign-ApplicationRegistry-IApplicationRegistry"></a>IApplicationRegistry</h4>
<p>The interface <tt>IApplicationRegistry</tt> provides accessors for the following:</p>
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<li><a href="Qpid Design - Configuration.html#QpidDesign-Configuration-ConfiguredObjects" title="ConfiguredObjects on Qpid Design - Configuration">Configured Objects</a></li>
<li>the raw <a href="Qpid Design - Configuration.html#QpidDesign-Configuration-Configuration" title="Configuration on Qpid Design - Configuration">Configuration</a></li>
<li>various services such as the queue registry and exchange registry</li>
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<h4><a name="QpidDesign-ApplicationRegistry-ApplicationRegistry"></a>ApplicationRegistry</h4>
<p>The abstract class <tt>ApplicationRegistry</tt> is a partial implementation of <tt>IApplicationRegistry</tt> that provides an implementation of the configured object cache as well as providing singleton access to the concrete application registry.</p>
<p>Subclasses should instantiate the appropriate services in order to provide access to them. Initialisation of these must be done in the <tt>initialise</tt> method so that those services can use the <tt>ApplicationRegistry</tt> themselves - attempting to initialise services in the constructor can result in <tt>NullPointerExceptions</tt> if they use the registry.</p>
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<td align="center"><font color="grey">Document generated by Confluence on Apr 22, 2008 02:47</font></td>
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