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<h2>Overview</h2>

<p>The transaction implementation is using the <a class="confluence-link" href="/display/AWARE/Unit+Of+Work" data-linked-resource-id="3415" data-linked-resource-type="page" data-linked-resource-default-alias="Unit Of Work" data-base-url="http://docs.codehaus.org">Unit Of Work</a> and the <a class="confluence-link" href="/display/AWARE/UnitOfWorkProtocol" data-linked-resource-id="3460" data-linked-resource-type="page" data-linked-resource-default-alias="UnitOfWorkProtocol" data-base-url="http://docs.codehaus.org">UnitOfWorkProtocol</a> aspect to achive completely transparent transaction demarcation. You can registers one or many listeners to the <a class="confluence-link" href="/display/AWARE/Unit+Of+Work" data-linked-resource-id="3415" data-linked-resource-type="page" data-linked-resource-default-alias="Unit Of Work" data-base-url="http://docs.codehaus.org">Unit Of Work</a> which will be called upon <em>commit</em>, <em>rollback</em> etc.</p>

<p>Each transaction implementation consists of two parts:</p>

<ul>
	<li>A transaction manager which has to implement the <code>org.codehaus.aware.transaction.TransactionManager</code> interface</li>
	<li>A Unit Of Work listener, which has to implement the <code>org.codehaus.aware.unitofwork.UnitOfWorkListener</code> interface</li>
</ul>

<p>See the <a class="confluence-link" href="/display/AWARE/UnitOfWorkProtocol" data-linked-resource-id="3460" data-linked-resource-type="page" data-linked-resource-default-alias="UnitOfWorkProtocol" data-base-url="http://docs.codehaus.org">UnitOfWorkProtocol</a> for details on how to define the <a class="confluence-link" href="/display/AWARE/Unit+Of+Work" data-linked-resource-id="3415" data-linked-resource-type="page" data-linked-resource-default-alias="Unit Of Work" data-base-url="http://docs.codehaus.org">Unit Of Work</a> aspect, e.g. on which methods a new transaction should be started, committed and roll backed etc.</p>

<p>The transaction implementations work great in conjunction with the <a class="confluence-link" href="/display/AWARE/Persistence" data-linked-resource-id="3018" data-linked-resource-type="page" data-linked-resource-default-alias="Persistence" data-base-url="http://docs.codehaus.org">Persistence</a> components, in which it can for example make them aware of JTA two-phase commit transactions etc. You just register your listeners in the <a class="confluence-link" href="/display/AWARE/Unit+Of+Work" data-linked-resource-id="3415" data-linked-resource-type="page" data-linked-resource-default-alias="Unit Of Work" data-base-url="http://docs.codehaus.org">Unit Of Work</a> and the complete transaction will not be committed until all listeners have agreed on that. </p>

<h2>Transaction Schemes</h2>