/**
* Copyright 2003-2010 Terracotta, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.sf.ehcache.hibernate.regions;
import java.util.Properties;
import net.sf.ehcache.Ehcache;
import net.sf.ehcache.Element;
import net.sf.ehcache.concurrent.CacheLockProvider;
import net.sf.ehcache.concurrent.LockType;
import net.sf.ehcache.concurrent.StripedReadWriteLockSync;
import net.sf.ehcache.constructs.nonstop.NonStopCacheException;
import net.sf.ehcache.hibernate.nonstop.HibernateNonstopCacheExceptionHandler;
import net.sf.ehcache.hibernate.strategy.EhcacheAccessStrategyFactory;
import org.hibernate.cache.CacheDataDescription;
import org.hibernate.cache.CacheException;
import org.hibernate.cache.TransactionalDataRegion;
import org.hibernate.cfg.Settings;
/**
* An Ehcache specific TransactionalDataRegion.
* <p>
* This is the common superclass entity and collection regions.
*
* @author Chris Dennis
* @author Greg Luck
* @author Emmanuel Bernard
* @author Abhishek Sanoujam
*/
public class EhcacheTransactionalDataRegion extends EhcacheDataRegion implements TransactionalDataRegion {
private static final int LOCAL_LOCK_PROVIDER_CONCURRENCY = 128;
/**
* Hibernate settings associated with the persistence unit.
*/
protected final Settings settings;
/**
* Metadata associated with the objects stored in the region.
*/
protected final CacheDataDescription metadata;
private final CacheLockProvider lockProvider;
/**
* Construct an transactional Hibernate cache region around the given Ehcache instance.
*/
EhcacheTransactionalDataRegion(EhcacheAccessStrategyFactory accessStrategyFactory, Ehcache cache, Settings settings,
CacheDataDescription metadata, Properties properties) {
super(accessStrategyFactory, cache, properties);
this.settings = settings;
this.metadata = metadata;
Object context = cache.getInternalContext();
if (context instanceof CacheLockProvider) {
this.lockProvider = (CacheLockProvider) context;
} else {
this.lockProvider = new StripedReadWriteLockSync(LOCAL_LOCK_PROVIDER_CONCURRENCY);
}
}
/**
* Return the hibernate settings
*
* @return settings
*/
public Settings getSettings() {
return settings;
}
/**
* {@inheritDoc}
*/
public boolean isTransactionAware() {
return false;
}
/**
* {@inheritDoc}
*/
public CacheDataDescription getCacheDataDescription() {
return metadata;
}
/**
* Get the value mapped to this key, or null if no value is mapped to this key.
*/
public final Object get(Object key) {
try {
Element element = cache.get(key);
if (element == null) {
return null;
} else {
return element.getObjectValue();
}
} catch (net.sf.ehcache.CacheException e) {
if (e instanceof NonStopCacheException) {
HibernateNonstopCacheExceptionHandler.getInstance().handleNonstopCacheException((NonStopCacheException) e);
return null;
} else {
throw new CacheException(e);
}
}
}
/**
* Map the given value to the given key, replacing any existing mapping for this key
*/
public final void put(Object key, Object value) throws CacheException {
try {
Element element = new Element(key, value);
cache.put(element);
} catch (IllegalArgumentException e) {
throw new CacheException(e);
} catch (IllegalStateException e) {
throw new CacheException(e);
} catch (net.sf.ehcache.CacheException e) {
if (e instanceof NonStopCacheException) {
HibernateNonstopCacheExceptionHandler.getInstance().handleNonstopCacheException((NonStopCacheException) e);
} else {
throw new CacheException(e);
}
}
}
/**
* Remove the mapping for this key (if any exists).
*/
public final void remove(Object key) throws CacheException {
try {
cache.remove(key);
} catch (ClassCastException e) {
throw new CacheException(e);
} catch (IllegalStateException e) {
throw new CacheException(e);
} catch (net.sf.ehcache.CacheException e) {
if (e instanceof NonStopCacheException) {
HibernateNonstopCacheExceptionHandler.getInstance().handleNonstopCacheException((NonStopCacheException) e);
} else {
throw new CacheException(e);
}
}
}
/**
* Remove all mapping from this cache region.
*/
public final void clear() throws CacheException {
try {
cache.removeAll();
} catch (IllegalStateException e) {
throw new CacheException(e);
} catch (net.sf.ehcache.CacheException e) {
if (e instanceof NonStopCacheException) {
HibernateNonstopCacheExceptionHandler.getInstance().handleNonstopCacheException((NonStopCacheException) e);
} else {
throw new CacheException(e);
}
}
}
/**
* Attempts to write lock the mapping for the given key.
*/
public final void writeLock(Object key) {
try {
lockProvider.getSyncForKey(key).lock(LockType.WRITE);
} catch (net.sf.ehcache.CacheException e) {
if (e instanceof NonStopCacheException) {
HibernateNonstopCacheExceptionHandler.getInstance().handleNonstopCacheException((NonStopCacheException) e);
} else {
throw new CacheException(e);
}
}
}
/**
* Attempts to write unlock the mapping for the given key.
*/
public final void writeUnlock(Object key) {
try {
lockProvider.getSyncForKey(key).unlock(LockType.WRITE);
} catch (net.sf.ehcache.CacheException e) {
if (e instanceof NonStopCacheException) {
HibernateNonstopCacheExceptionHandler.getInstance().handleNonstopCacheException((NonStopCacheException) e);
} else {
throw new CacheException(e);
}
}
}
/**
* Attempts to read lock the mapping for the given key.
*/
public final void readLock(Object key) {
try {
lockProvider.getSyncForKey(key).lock(LockType.WRITE);
} catch (net.sf.ehcache.CacheException e) {
if (e instanceof NonStopCacheException) {
HibernateNonstopCacheExceptionHandler.getInstance().handleNonstopCacheException((NonStopCacheException) e);
} else {
throw new CacheException(e);
}
}
}
/**
* Attempts to read unlock the mapping for the given key.
*/
public final void readUnlock(Object key) {
try {
lockProvider.getSyncForKey(key).unlock(LockType.WRITE);
} catch (net.sf.ehcache.CacheException e) {
if (e instanceof NonStopCacheException) {
HibernateNonstopCacheExceptionHandler.getInstance().handleNonstopCacheException((NonStopCacheException) e);
} else {
throw new CacheException(e);
}
}
}
/**
* Returns <code>true</code> if the locks used by the locking methods of this region are the independent of the cache.
* <p>
* Independent locks are not locked by the cache when the cache is accessed directly. This means that for an independent lock
* lock holds taken through a region method will not block direct access to the cache via other means.
*/
public final boolean locksAreIndependentOfCache() {
return lockProvider instanceof StripedReadWriteLockSync;
}
}