/*
* JBoss, Home of Professional Open Source
* Copyright 2010, Red Hat Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.as.ejb3.component.entity.entitycache;
import org.jboss.as.ejb3.component.entity.EntityBeanComponent;
import org.jboss.as.ejb3.component.entity.EntityBeanComponentInstance;
import org.jboss.logging.Logger;
import javax.ejb.NoSuchEJBException;
import javax.transaction.Synchronization;
import javax.transaction.TransactionSynchronizationRegistry;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
/**
* Cache of entity bean component instances by transaction key
* @author Stuart Douglas
*/
public class TransactionLocalEntityCache implements ReadyEntityCache {
private final TransactionSynchronizationRegistry transactionSynchronizationRegistry;
private final ConcurrentMap<Object, Map<Object, EntityBeanComponentInstance>> cache = new ConcurrentHashMap<Object, Map<Object, EntityBeanComponentInstance>>(Runtime.getRuntime().availableProcessors());
private final EntityBeanComponent component;
private static final Logger logger = Logger.getLogger(TransactionLocalEntityCache.class);
public TransactionLocalEntityCache(final EntityBeanComponent component) {
this.component = component;
this.transactionSynchronizationRegistry = component.getTransactionSynchronizationRegistry();
}
@Override
public EntityBeanComponentInstance get(final Object key) throws NoSuchEJBException {
if (!isTransactionActive()) {
return createInstance(key);
}
final Map<Object, EntityBeanComponentInstance> map = prepareCache();
EntityBeanComponentInstance instance = map.get(key);
if (instance == null) {
instance = createInstance(key);
map.put(key, instance);
}
return instance;
}
@Override
public void discard(final EntityBeanComponentInstance instance) {
if (isTransactionActive()) {
final Object key = transactionSynchronizationRegistry.getTransactionKey();
final Map<Object, EntityBeanComponentInstance> map = cache.get(key);
if (map != null) {
map.remove(instance.getPrimaryKey());
}
}
instance.discard();
}
@Override
public void create(final EntityBeanComponentInstance instance) throws NoSuchEJBException {
if (isTransactionActive()) {
final Map<Object, EntityBeanComponentInstance> map = prepareCache();
map.put(instance.getPrimaryKey(), instance);
}
}
@Override
public void release(final EntityBeanComponentInstance instance, boolean success) {
//TODO: this should probably be somewhere else
//roll back unsuccessful removal
if (!success && instance.isRemoved()) {
instance.setRemoved(false);
}
instance.passivate();
component.getPool().release(instance);
discard(instance);
}
public void reference(EntityBeanComponentInstance instance) {
}
@Override
public synchronized void start() {
}
@Override
public synchronized void stop() {
}
private Map<Object, EntityBeanComponentInstance> prepareCache() {
final Object key = transactionSynchronizationRegistry.getTransactionKey();
Map<Object, EntityBeanComponentInstance> map = cache.get(key);
if (map != null) {
return map;
}
map = Collections.synchronizedMap(new HashMap<Object, EntityBeanComponentInstance>());
final Map<Object, EntityBeanComponentInstance> existing = cache.putIfAbsent(key, map);
if (existing != null) {
map = existing;
}
transactionSynchronizationRegistry.registerInterposedSynchronization(new Synchronization() {
@Override
public void beforeCompletion() {
}
@Override
public void afterCompletion(final int status) {
cache.remove(key);
}
});
return map;
}
private EntityBeanComponentInstance createInstance(Object pk) {
final EntityBeanComponentInstance instance = component.getPool().get();
instance.associate(pk);
return instance;
}
private boolean isTransactionActive() {
return transactionSynchronizationRegistry.getTransactionKey() != null;
}
}