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CacheDistributionPolicy (OpenJPA Parent POM 2.3.0 API) | |
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org.apache.openjpa.datacache</FONT> | |
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Interface CacheDistributionPolicy</H2> | |
<DL> | |
<DT><B>All Superinterfaces:</B> <DD><A HREF="../../../../org/apache/openjpa/lib/conf/Configurable.html" title="interface in org.apache.openjpa.lib.conf">Configurable</A></DD> | |
</DL> | |
<DL> | |
<DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../org/apache/openjpa/datacache/DefaultCacheDistributionPolicy.html" title="class in org.apache.openjpa.datacache">DefaultCacheDistributionPolicy</A>, <A HREF="../../../../org/apache/openjpa/datacache/TypeBasedCacheDistributionPolicy.html" title="class in org.apache.openjpa.datacache">TypeBasedCacheDistributionPolicy</A></DD> | |
</DL> | |
<HR> | |
<DL> | |
<DT><PRE>public interface <B>CacheDistributionPolicy</B><DT>extends <A HREF="../../../../org/apache/openjpa/lib/conf/Configurable.html" title="interface in org.apache.openjpa.lib.conf">Configurable</A></DL> | |
</PRE> | |
<P> | |
A policy determines whether a given entity should be cached and if true, in which named partition of the | |
cache. | |
<br> | |
This policy is activated for each instance if and only if the cache settings specified in metadata | |
such as JPA specification defined <CODE>@Cacheable</CODE> annotation or OpenJPA specific | |
<A HREF="../../../../org/apache/openjpa/persistence/DataCache.html" title="annotation in org.apache.openjpa.persistence"><CODE>@DataCache</CODE></A> annotation or configuration property | |
such as <code>javax.persistence.sharedCache.mode</code> determined the type of the instance being cachable. | |
<br> | |
For example, a specific policy will never be active for when <code>javax.persistence.sharedCache.mode</code> | |
is set to <code>NONE</code>. | |
<br> | |
Distribution Policies are configurable. So a specific policy can be configured as | |
<pre> | |
<property name="openjpa.CacheDistributionPolicy" value="com.acme.FooPolicy(param1='xyz',param2=true)"/> | |
</pre> | |
where <code>com.acme.FooPolicy</code> is an implementation of this interface and defines bean style setter and | |
getter methods for String property <code>param1</code> and boolean property <code>param2</code>. | |
<P> | |
<P> | |
<DL> | |
<DT><B>Since:</B></DT> | |
<DD>2.0.0</DD> | |
<DT><B>Author:</B></DT> | |
<DD>Pinaki Poddar</DD> | |
</DL> | |
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<CODE> <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A></CODE></FONT></TD> | |
<TD><CODE><B><A HREF="../../../../org/apache/openjpa/datacache/CacheDistributionPolicy.html#selectCache(org.apache.openjpa.kernel.OpenJPAStateManager, java.lang.Object)">selectCache</A></B>(<A HREF="../../../../org/apache/openjpa/kernel/OpenJPAStateManager.html" title="interface in org.apache.openjpa.kernel">OpenJPAStateManager</A> sm, | |
<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> context)</CODE> | |
<BR> | |
Selects the name of the cache where the given managed proxy object state be cached.</TD> | |
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<TH ALIGN="left"><B>Methods inherited from interface org.apache.openjpa.lib.conf.<A HREF="../../../../org/apache/openjpa/lib/conf/Configurable.html" title="interface in org.apache.openjpa.lib.conf">Configurable</A></B></TH> | |
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<TD><CODE><A HREF="../../../../org/apache/openjpa/lib/conf/Configurable.html#endConfiguration()">endConfiguration</A>, <A HREF="../../../../org/apache/openjpa/lib/conf/Configurable.html#setConfiguration(org.apache.openjpa.lib.conf.Configuration)">setConfiguration</A>, <A HREF="../../../../org/apache/openjpa/lib/conf/Configurable.html#startConfiguration()">startConfiguration</A></CODE></TD> | |
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<A NAME="selectCache(org.apache.openjpa.kernel.OpenJPAStateManager, java.lang.Object)"><!-- --></A><H3> | |
selectCache</H3> | |
<PRE> | |
<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> <B>selectCache</B>(<A HREF="../../../../org/apache/openjpa/kernel/OpenJPAStateManager.html" title="interface in org.apache.openjpa.kernel">OpenJPAStateManager</A> sm, | |
<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> context)</PRE> | |
<DL> | |
<DD>Selects the name of the cache where the given managed proxy object state be cached. | |
<P> | |
<DD><DL> | |
</DL> | |
</DD> | |
<DD><DL> | |
<DT><B>Parameters:</B><DD><CODE>sm</CODE> - the managed proxy object to be cached. The actual managed instance can be accessed from the proxy | |
instance simply as <code>sm.getManagedInstance()</code>.<DD><CODE>context</CODE> - the context of invocation. No specific semantics is attributed currently. Can be null. | |
<DT><B>Returns:</B><DD>name of the cache or null, implying that that the instance should not be cached.</DL> | |
</DD> | |
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