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java.lang.Objectorg.apache.openjpa.lib.util.concurrent.AbstractConcurrentEventManager
org.apache.openjpa.datacache.AbstractDataCache
org.apache.openjpa.datacache.ConcurrentDataCache
public class ConcurrentDataCache
A DataCache
implementation that is optimized for concurrent
access. When the cache fills up, values to remove from cache are chosen
randomly. Due to race conditions, it is possible that a get call might not
return a cached instance if that instance is being transferred between
internal datastructures.
Field Summary |
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Fields inherited from class org.apache.openjpa.datacache.AbstractDataCache |
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conf, log |
Fields inherited from class org.apache.openjpa.lib.util.concurrent.AbstractConcurrentEventManager |
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_listeners |
Fields inherited from interface org.apache.openjpa.datacache.DataCache |
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NAME_DEFAULT |
Constructor Summary | |
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ConcurrentDataCache()
|
Method Summary | |
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protected void |
clearInternal()
Clear the cache. |
CacheMap |
getCacheMap()
Returns the underlying CacheMap that this cache is using. |
int |
getCacheSize()
Returns the maximum number of unpinned objects to keep hard references to. |
protected DataCachePCData |
getInternal(Object key)
Return the object for the given oid. |
int |
getSoftReferenceSize()
Returns the maximum number of unpinned objects to keep soft references to. |
void |
initialize(DataCacheManager mgr)
Initialize any resources associated with the given DataCacheManager . |
protected CacheMap |
newCacheMap()
Return the map to use as an internal cache; entry expirations must invoke AbstractDataCache.keyRemoved(java.lang.Object, boolean) . |
protected boolean |
pinInternal(Object key)
Pin an object to the cache. |
protected DataCachePCData |
putInternal(Object key,
DataCachePCData pc)
Add the given object to the cache, returning the old object under the given oid. |
protected void |
removeAllInternal(Class cls,
boolean subs)
Evict objects in cache by class. |
protected DataCachePCData |
removeInternal(Object key)
Remove the object under the given oid from the cache. |
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. |
void |
unpinAll(Class cls,
boolean subs)
Unpin all oids associaed with the given type from the cache. |
protected boolean |
unpinInternal(Object key)
Unpin an object from the cache. |
void |
writeLock()
Obtain a write lock on the cache. |
void |
writeUnlock()
Release the write lock on the cache. |
Methods inherited from class org.apache.openjpa.datacache.AbstractDataCache |
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addExpirationListener, afterCommit, clear, close, close, commit, contains, containsAll, endConfiguration, fireEvent, get, getAll, getEvictionSchedule, getName, isClosed, keyRemoved, pin, pinAll, pinAll, put, putAllInternal, recacheUpdates, remove, removeAll, removeAll, removeAllInternal, removeAllTypeNamesInternal, removeExpirationListener, setConfiguration, setEvictionSchedule, setName, startConfiguration, toString, unpin, unpinAll, update |
Methods inherited from class org.apache.openjpa.lib.util.concurrent.AbstractConcurrentEventManager |
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addListener, fireEvent, getListeners, hasListener, hasListeners, isFailFast, newListenerCollection, removeListener, setFailFast |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Methods inherited from interface org.apache.openjpa.event.RemoteCommitListener |
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afterCommit, close |
Constructor Detail |
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public ConcurrentDataCache()
Method Detail |
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public CacheMap getCacheMap()
CacheMap
that this cache 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.
public void setCacheSize(int size)
size
, then this method will result in the cache
flushing old values.
public int getCacheSize()
public void setSoftReferenceSize(int size)
size
, then this method will result in the cache
flushing values.
public int getSoftReferenceSize()
-1
.
public void initialize(DataCacheManager mgr)
DataCache
DataCacheManager
.
initialize
in interface DataCache
initialize
in class AbstractDataCache
public void unpinAll(Class cls, boolean subs)
DataCache
unpinAll
in interface DataCache
unpinAll
in class AbstractDataCache
subs
- Whether to include subclasses.public void writeLock()
DataCache
writeLock
in interface DataCache
public void writeUnlock()
DataCache
writeUnlock
in interface DataCache
protected CacheMap newCacheMap()
AbstractDataCache.keyRemoved(java.lang.Object, boolean)
.
protected DataCachePCData getInternal(Object key)
AbstractDataCache
getInternal
in class AbstractDataCache
protected DataCachePCData putInternal(Object key, DataCachePCData pc)
AbstractDataCache
putInternal
in class AbstractDataCache
protected DataCachePCData removeInternal(Object key)
AbstractDataCache
removeInternal
in class AbstractDataCache
protected void removeAllInternal(Class cls, boolean subs)
AbstractDataCache
removeAllInternal
in class AbstractDataCache
protected void clearInternal()
AbstractDataCache
clearInternal
in class AbstractDataCache
protected boolean pinInternal(Object key)
AbstractDataCache
pinInternal
in class AbstractDataCache
protected boolean unpinInternal(Object key)
AbstractDataCache
unpinInternal
in class AbstractDataCache
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This documentation is deprecated and will be removed in the next release of WebLogic Server.