org.apache.activemq.thread.DeterministicTaskRunner Maven / Gradle / Ivy
/**
* 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.activemq.thread;
import java.util.concurrent.Executor;
/**
*
*/
public class DeterministicTaskRunner implements TaskRunner {
private final Executor executor;
private final Task task;
private final Runnable runable;
private boolean shutdown;
/**Constructor
* @param executor
* @param task
*/
public DeterministicTaskRunner(Executor executor, Task task) {
this.executor = executor;
this.task = task;
this.runable = new Runnable() {
public void run() {
Thread.currentThread();
runTask();
}
};
}
/**
* We Expect MANY wakeup calls on the same TaskRunner - but each
* needs to run
*/
public void wakeup() throws InterruptedException {
synchronized (runable) {
if (shutdown) {
return;
}
executor.execute(runable);
}
}
/**
* shut down the task
*
* @throws InterruptedException
*/
public void shutdown(long timeout) throws InterruptedException {
synchronized (runable) {
shutdown = true;
}
}
public void shutdown() throws InterruptedException {
shutdown(0);
}
final void runTask() {
synchronized (runable) {
if (shutdown) {
runable.notifyAll();
return;
}
}
task.iterate();
}
}