/*
* JBoss, Home of Professional Open Source.
* Copyright 2011, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file 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.jpa.container;
import java.util.ArrayList;
import java.util.List;
import org.jboss.as.jpa.messages.JpaLogger;
/**
* Tracks the lifecycle of created XPC Entity Managers
*
* @author Scott Marlow
*/
public class CreatedEntityManagers {
private static ExtendedEntityManager[] EMPTY = new ExtendedEntityManager[0];
// at injection time, the SFSB that is being created isn't registered right away
// that happens later at postConstruct time.
//
// The deferToPostConstruct is a one item length store (hack)
private static ThreadLocal<List<ExtendedEntityManager>> deferToPostConstruct = new ThreadLocal<List<ExtendedEntityManager>>() {
protected List<ExtendedEntityManager> initialValue() {
return new ArrayList<ExtendedEntityManager>(1);
}
};
/**
* At injection time of a XPC, register the XPC (step 1 of 2)
* finishRegistrationOfPersistenceContext is step 2
*
* @param xpc The ExtendedEntityManager
*/
public static void registerPersistenceContext(ExtendedEntityManager xpc) {
if (xpc == null) {
throw JpaLogger.ROOT_LOGGER.nullParameter("SFSBXPCMap.RegisterPersistenceContext", "EntityManager");
}
final List<ExtendedEntityManager> store = deferToPostConstruct.get();
store.add(xpc);
}
/**
* Called by postconstruct interceptor
*/
public static ExtendedEntityManager[] getDeferredEntityManagers() {
List<ExtendedEntityManager> store = deferToPostConstruct.get();
try {
if(store.isEmpty()) {
return EMPTY;
} else {
return store.toArray(new ExtendedEntityManager[store.size()]);
}
} finally {
store.clear();
}
}
}