/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 WARRANTIESOR 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.aries.blueprint.utils.threading.impl;
import java.util.Collections;
import java.util.Queue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.atomic.AtomicReference;
public class DiscardableRunnable implements Runnable, Discardable<Runnable>
{
private AtomicReference<Runnable> r = new AtomicReference<Runnable>();
private Queue<Discardable<Runnable>> _removeFromListOnRun;
public DiscardableRunnable(Runnable run, Queue<Discardable<Runnable>> _unprocessedWork) {
r.set(run);
_removeFromListOnRun = _unprocessedWork;
_removeFromListOnRun.add(this);
}
private DiscardableRunnable(Runnable run)
{
r.set(run);
_removeFromListOnRun = new LinkedBlockingQueue<Discardable<Runnable>>();
}
public void run()
{
_removeFromListOnRun.remove(this);
Runnable run = r.get();
if (run != null) {
run.run();
}
}
public Runnable discard()
{
_removeFromListOnRun.remove(this);
return new DiscardableRunnable(r.getAndSet(null));
}
}