org.apache.openjpa.datacache
Class TypeBasedCacheDistributionPolicy

java.lang.Object
  org.apache.openjpa.datacache.DefaultCacheDistributionPolicy
      org.apache.openjpa.datacache.TypeBasedCacheDistributionPolicy

All Implemented Interfaces:

CacheDistributionPolicy, Configurable

public class TypeBasedCacheDistributionPolicy
extends DefaultCacheDistributionPolicy
implements CacheDistributionPolicy

A cache distribution policy based on the type of the managed objects.
The policy is configured by specifying list of included or excluded types. The lists are specified as fully-qualified persistence class names separated by semicolon.
The policy checks for the given instance by its type whether the class name appears in exclusion or inclusion lists. If the class name appears in exclusion list then the instance is not cached. Otherwise, if an inclusion list exists and the class name appears in inclusion list or @DataCache annotation is specified on the class meta data, then the instance is cached.

Author:

Pinaki Poddar

Constructor Summary

TypeBasedCacheDistributionPolicy()

Method Summary

Set<String>	getExcludedTypes() Gets the excluded types, if configured.
Set<String>	getIncludedTypes() Gets the included types, if configured.
String	selectCache(OpenJPAStateManager sm, Object context) Selects the name of the cache where the given managed proxy object state be cached.
void	setExcludedTypes(String types) Sets excluded types from a semicolon separated list of type names.
void	setIncludedTypes(String types) Sets included types from a semicolon separated list of type names.

Methods inherited from class org.apache.openjpa.datacache.DefaultCacheDistributionPolicy

endConfiguration, setConfiguration, startConfiguration

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.openjpa.lib.conf.Configurable

endConfiguration, setConfiguration, startConfiguration

Constructor Detail

TypeBasedCacheDistributionPolicy

public TypeBasedCacheDistributionPolicy()

Method Detail

getExcludedTypes

public Set<String> getExcludedTypes()

Gets the excluded types, if configured.

setExcludedTypes

public void setExcludedTypes(String types)

Sets excluded types from a semicolon separated list of type names.

getIncludedTypes

public Set<String> getIncludedTypes()

Gets the included types, if configured.

setIncludedTypes

public void setIncludedTypes(String types)

Sets included types from a semicolon separated list of type names.

selectCache

public String selectCache(OpenJPAStateManager sm,
                          Object context)

Description copied from interface: CacheDistributionPolicy

Selects the name of the cache where the given managed proxy object state be cached.

Specified by:

selectCache in interface CacheDistributionPolicy

Overrides:

selectCache in class DefaultCacheDistributionPolicy

Parameters:

sm - the managed proxy object to be cached. The actual managed instance can be accessed from the proxy instance simply as sm.getManagedInstance().

context - the context of invocation. No specific semantics is attributed currently. Can be null.

Returns:

name of the cache or null, implying that that the instance should not be cached.