/* | |
* 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 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.axis2.jaxws.sample.parallelasync.common; | |
import java.util.concurrent.ArrayBlockingQueue; | |
import java.util.concurrent.ThreadPoolExecutor; | |
import java.util.concurrent.TimeUnit; | |
import java.util.concurrent.locks.Condition; | |
import java.util.concurrent.locks.ReentrantLock; | |
/** | |
* A custom executor that can be paused for testing of exceptions that occur | |
* before an item is executed. This executor provides absolue control over its | |
* thread size via size parameter in the constructor | |
*/ | |
public class PausableExecutor extends ThreadPoolExecutor { | |
private boolean isPaused; | |
private ReentrantLock pauseLock = new ReentrantLock(); | |
private Condition unpaused = pauseLock.newCondition(); | |
public PausableExecutor(int size) { | |
super(size, size, 1, TimeUnit.SECONDS, | |
new ArrayBlockingQueue<Runnable>(size)); | |
} | |
protected void beforeExecute(Thread t, Runnable r) { | |
super.beforeExecute(t, r); | |
pauseLock.lock(); | |
try { | |
while (isPaused) | |
unpaused.await(); | |
} catch (InterruptedException ie) { | |
t.interrupt(); | |
} finally { | |
pauseLock.unlock(); | |
} | |
} | |
public void pause() { | |
pauseLock.lock(); | |
try { | |
isPaused = true; | |
} finally { | |
pauseLock.unlock(); | |
} | |
} | |
public void resume() { | |
pauseLock.lock(); | |
try { | |
isPaused = false; | |
unpaused.signalAll(); | |
} finally { | |
pauseLock.unlock(); | |
} | |
} | |
} |