/*
* JBoss, Home of Professional Open Source.
* Copyright 2014, 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.capedwarf.datastore;
import java.util.ConcurrentModificationException;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import javax.transaction.Transaction;
import com.google.appengine.api.datastore.Key;
/**
* Standalone tracking - more performant.
*
* @author <a href="mailto:ales.justin@jboss.org">Ales Justin</a>
*/
class StandaloneTxTracker implements TxTracker {
private final ConcurrentMap<Key, Transaction> usedRoots = new ConcurrentHashMap<>();
public void track(Key currentRoot) {
final Transaction current = CapedwarfTransaction.getTx();
final Transaction previous = usedRoots.putIfAbsent(currentRoot, current);
if (previous != null && current.equals(previous) == false) {
throw new ConcurrentModificationException("Different transactions on same entity group: " + currentRoot);
}
}
public void beforeCompletion(Key currentRoot) {
}
public void afterCompletion(int status, Key currentRoot) {
usedRoots.remove(currentRoot);
}
public void dump() {
System.err.println("Used roots: " + usedRoots);
}
}