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<title>Apache Qpid Dispatch™: A Platform for Building AMQP Infrastructure</title>
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<h1>Apache Qpid Dispatch™</h1>
<h2>A Platform for Building AMQP Infrastructure</h2>
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<p>Qpid Dispatch is a library to help developers build infrastructure
components for AMQP. Dispatch is not a general-purpose Messaging API.
Rather, it is a foundation on which to build applications, services, and
appliances that need direct access to the detailed constructs of AMQP.</p>
<hr width="80%" />
<h2>Overview</h2>
<p>Dispatch is an extension of the Engine and Driver interfaces of
<a href="http://qpid.apache.org/proton">Qpid Proton</a>. It neither
uses nor exposes the Messenger interface of Proton. Rather, it
provides a way for developers to use Proton's more detailed Engine
facility. The following features are provided:</p>
<ul>
<li>An asynchronous, event-oriented application environment</li>
<li>Safe multi-threaded use of Proton</li>
<li>Operating System Signal handling</li>
<li>Quiesce and Resume for the application's threads</li>
<li>Timers</li>
<li>Resilient outbound connections (retry/reconnect)</li>
<li>Polling support for the application's non-AMQP file descriptors</li>
<li>An AMQP Node Container that allows the developer to create
custom node types</li>
</ul>
<p />
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<h2>Architecture</h2>
<center><img src="images/arch.png" /></center>
<ul>
<li><b>Proton Engine and Driver</b> provide the underlying AMQP capability</li>
<li><a href="doxygen/server/modules.html">Dispatch Server</a>
wraps Proton connections in a multi-threaded server environment</li>
<li><b>Dispatch Container</b> provides management of AMQP nodes (links, termini, and deliveries)</li>
<li><b>Dispatch Message</b> provides efficient message encode/decode, optimized for messaging intermediaries</li>
<li>The <b>Application</b> uses all of the above services to implement scalable and performant AMQP infrastructure</li>
</ul>
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