// Copyright 2004, 2005 The Apache Software Foundation
//
// 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 org.apache.hivemind.service.impl;
import java.util.Iterator;
import org.apache.hivemind.service.ThreadCleanupListener;
import org.apache.hivemind.service.ThreadEventNotifier;
import org.apache.hivemind.util.EventListenerList;
/**
* Implementation of {@link org.apache.hivemind.service.ThreadEventNotifier},
* available as service <code>hivemind.ThreadEventNotifier</code>.
*
* @author Howard Lewis Ship
*/
public class ThreadEventNotifierImpl implements ThreadEventNotifier
{
private ThreadLocal _storage = new ThreadLocal();
public void addThreadCleanupListener(ThreadCleanupListener listener)
{
EventListenerList list = (EventListenerList) _storage.get();
if (list == null)
{
list = new EventListenerList();
_storage.set(list);
}
list.addListener(listener);
}
public void removeThreadCleanupListener(ThreadCleanupListener listener)
{
EventListenerList list = (EventListenerList) _storage.get();
if (list != null)
list.removeListener(listener);
}
public void fireThreadCleanup()
{
// Here's where we need the CursorableLinkedList since listeners
// are free to unregister as listeners from threadDidCleanup() and
// we need to avoid concurrent modification errors.
EventListenerList list = (EventListenerList) _storage.get();
if (list == null)
return;
Iterator i = list.getListeners();
while (i.hasNext())
{
ThreadCleanupListener listener = (ThreadCleanupListener) i.next();
// Each listener may decide to remove itself; that's OK,
// EventListenerList handles that kind of concurrent modification
// well.
listener.threadDidCleanup();
}
}
}