kodo.datacache
Class LRUDataCache

java.lang.Object
  org.apache.openjpa.lib.util.concurrent.AbstractConcurrentEventManager
      org.apache.openjpa.datacache.AbstractDataCache
          kodo.datacache.LRUDataCache

All Implemented Interfaces:

Serializable, DataCache, RemoteCommitListener, Configurable, Closeable, EventManager

public class LRUDataCache
extends AbstractDataCache
implements RemoteCommitListener

An lru-based data cache.

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.openjpa.datacache.AbstractDataCache

conf, log

Fields inherited from class org.apache.openjpa.lib.util.concurrent.AbstractConcurrentEventManager

_listeners

Fields inherited from interface org.apache.openjpa.datacache.DataCache

NAME_DEFAULT

Constructor Summary

LRUDataCache()

Method Summary

protected void	clearInternal()
CacheMap	getCacheMap() Returns the underlying CacheMap that this LRUDataCache is using.
int	getCacheSize() Returns the maximum number of unpinned objects to keep hard references to.
protected DataCachePCData	getInternal(Object key)
int	getSoftReferenceSize() Returns the maximum number of unpinned objects to keep soft references to.
void	initialize(DataCacheManager mgr)
protected void	keyRemoved(Object key, boolean expired)
protected boolean	pinInternal(Object key)
protected DataCachePCData	putInternal(Object key, DataCachePCData pc)
protected void	removeAllInternal(Class cls, boolean subs)
protected DataCachePCData	removeInternal(Object key)
void	setCacheSize(int size) Sets the maximum number of unpinned objects to keep hard references to.
void	setSoftReferenceSize(int size) Sets the maximum number of unpinned objects to keep soft references to.
protected boolean	unpinInternal(Object key)
void	writeLock()
void	writeUnlock()

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

addExpirationListener, afterCommit, clear, close, close, commit, contains, containsAll, endConfiguration, fireEvent, get, getAll, getEvictionSchedule, getName, isClosed, pin, pinAll, pinAll, put, putAllInternal, recacheUpdates, remove, removeAll, removeAll, removeAllInternal, removeAllTypeNamesInternal, removeExpirationListener, setConfiguration, setEvictionSchedule, setName, startConfiguration, toString, unpin, unpinAll, unpinAll, update

Methods inherited from class org.apache.openjpa.lib.util.concurrent.AbstractConcurrentEventManager

addListener, fireEvent, getListeners, hasListener, hasListeners, isFailFast, newListenerCollection, removeListener, setFailFast

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.openjpa.event.RemoteCommitListener

afterCommit, close

Constructor Detail

LRUDataCache

public LRUDataCache()

Method Detail

getCacheMap

public CacheMap getCacheMap()

Returns the underlying CacheMap that this LRUDataCache is using. This is not an unmodifiable view on the map, so care should be taken with this reference. Implementations should probably not modify the contents of the cache, but should only use this reference to obtain cache metrics.

setCacheSize

public void setCacheSize(int size)

Sets the maximum number of unpinned objects to keep hard references to. If the map contains more unpinned objects than size, then this method will result in the cache flushing old values.

getCacheSize

public int getCacheSize()

Returns the maximum number of unpinned objects to keep hard references to.

setSoftReferenceSize

public void setSoftReferenceSize(int size)

Sets the maximum number of unpinned objects to keep soft references to. If the map contains more soft references than size, then this method will result in the cache flushing values.

getSoftReferenceSize

public int getSoftReferenceSize()

Returns the maximum number of unpinned objects to keep soft references to. Defaults to -1.

initialize

public void initialize(DataCacheManager mgr)

Specified by:

initialize in interface DataCache

Overrides:

initialize in class AbstractDataCache

writeLock

public void writeLock()

Specified by:

writeLock in interface DataCache

writeUnlock

public void writeUnlock()

Specified by:

writeUnlock in interface DataCache

getInternal

protected DataCachePCData getInternal(Object key)

Specified by:

getInternal in class AbstractDataCache

putInternal

protected DataCachePCData putInternal(Object key,
                                      DataCachePCData pc)

Specified by:

putInternal in class AbstractDataCache

removeInternal

protected DataCachePCData removeInternal(Object key)

Specified by:

removeInternal in class AbstractDataCache

removeAllInternal

protected void removeAllInternal(Class cls,
                                 boolean subs)

Specified by:

removeAllInternal in class AbstractDataCache

clearInternal

protected void clearInternal()

Specified by:

clearInternal in class AbstractDataCache

pinInternal

protected boolean pinInternal(Object key)

Specified by:

pinInternal in class AbstractDataCache

unpinInternal

protected boolean unpinInternal(Object key)

Specified by:

unpinInternal in class AbstractDataCache

keyRemoved

protected void keyRemoved(Object key,
                          boolean expired)

Overrides:

keyRemoved in class AbstractDataCache