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<p>ActiveSpace implements a transactional and clustered <a class="confluence-link" href="/display/AS/JCache" data-linked-resource-id="13232" data-linked-resource-type="page" data-linked-resource-default-alias="JCache" data-base-url="http://docs.codehaus.org">JCache</a> providers. To get a feel for the APIs try the <a href="http://activespace.codehaus.org/maven/apidocs/org/codehaus/activespace/cache/package-summary.html">javadoc</a>. </p>

<p>There are currently two primary cache implementations</p>

<h2>TransactionalCache</h2>

<p>The <a href="http://activespace.codehaus.org/maven/apidocs/org/codehaus/activespace/cache/TransactionalCache.html">TransactionalCache</a> represents an in-JVM cache with full concurrent transactional support. So the cache can be used  in many concurrent threads within the same JVM and still provide a good, high peformance transactional JCache.</p>

<p>The TransactionalCache can plugin to various different transaction managers like JTA or Spring.</p>

<p>Currently only optimistic transactions are supported; but pessimistic transactions will be supported soon.</p>

<h2>ClusteredCache</h2>

<p>The <a href="http://activespace.codehaus.org/maven/apidocs/org/codehaus/activespace/cache/ClusteredCache.html">ClusteredCache</a> is-a TransactionalCache but instead of being purely local to a JVM it is clustered across a number of machines (JVMs).</p>

<p>The ClusteredCache makes use of the Space abstraction to replicate state across the cluster and provide full transactional semantics while also providing fast in-process caching.</p>

<p>Currently only optimistic transactions are supported; but pessimistic transactions will be supported soon.</p>

<h2>Using other VM based JCache providers</h2>

<p>There are many different open source in-VM caches, all of which can be trivially wrapped in a <a class="confluence-link" href="/display/AS/JCache" data-linked-resource-id="13232" data-linked-resource-type="page" data-linked-resource-default-alias="JCache" data-base-url="http://docs.codehaus.org">JCache</a> API wrapper if they don't yet natively support JCache.</p>

<p>ActiveSpace's transactional and clustered cache support will work with any in-VM JCache provider, so if you wish to use any other JCache provider in conjunction with ActiveSpace it should work fine.</p>

<p>As this project progresses we'll add standard wrappers/adapters to some of the existing open source cache projects like OSCache and EHCache.</p>