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/*
* Copyright (c) 2012, 2015, 2016 Eike Stepper (Loehne, Germany) and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.emf.cdo.internal.common.commit;
import org.eclipse.emf.cdo.common.commit.CDOCommitHistory;
import org.eclipse.net4j.util.event.IListener;
import org.eclipse.net4j.util.lifecycle.ILifecycle;
import org.eclipse.net4j.util.lifecycle.Lifecycle;
import org.eclipse.net4j.util.lifecycle.LifecycleEventAdapter;
import org.eclipse.net4j.util.lifecycle.LifecycleUtil;
import java.util.Map;
import java.util.Map.Entry;
import java.util.WeakHashMap;
/**
* @author Eike Stepper
* @since 4.2
*/
public abstract class CDOCommitHistoryProviderImpl<KEY, HISTORY extends CDOCommitHistory> extends Lifecycle implements CDOCommitHistory.Provider<KEY, HISTORY>
{
private Map<CDOCommitHistory, KEY> histories = new WeakHashMap<CDOCommitHistory, KEY>();
private IListener historyListener = new LifecycleEventAdapter()
{
@Override
protected void onDeactivated(ILifecycle lifecycle)
{
CDOCommitHistory history = (CDOCommitHistory)lifecycle;
history.removeListener(this);
synchronized (histories)
{
histories.remove(lifecycle);
}
}
};
public CDOCommitHistoryProviderImpl()
{
}
public CDOCommitHistory getHistory()
{
return getHistory(null);
}
public HISTORY getHistory(KEY key)
{
synchronized (histories)
{
for (Entry<CDOCommitHistory, KEY> entry : histories.entrySet())
{
KEY currentKey = entry.getValue();
if (currentKey == key)
{
CDOCommitHistory history = entry.getKey();
return activateHistory(history);
}
}
CDOCommitHistory history = createHistory(key);
history.addListener(historyListener);
histories.put(history, key);
return activateHistory(history);
}
}
protected abstract CDOCommitHistory createHistory(KEY key);
@SuppressWarnings("unchecked")
private HISTORY activateHistory(CDOCommitHistory history)
{
LifecycleUtil.activate(history);
return (HISTORY)history;
}
}
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