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/*******************************************************************************
* Copyright (c) 2006, 2016 Cognos Incorporated, IBM Corporation 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
******************************************************************************/
package org.eclipse.osgi.internal.log;
import java.util.LinkedList;
/**
* SerializedTaskQueue is a utility class that will allow asynchronous but serialized execution of tasks
*/
public class SerializedTaskQueue {
private static final int MAX_WAIT = 5000;
private final LinkedList<Runnable> tasks = new LinkedList<>();
private Thread thread;
private final String queueName;
public SerializedTaskQueue(String queueName) {
this.queueName = queueName;
}
public synchronized void put(Runnable newTask) {
tasks.add(newTask);
if (thread == null) {
thread = new Thread(queueName) {
public void run() {
Runnable task = nextTask(MAX_WAIT);
while (task != null) {
task.run();
task = nextTask(MAX_WAIT);
}
}
};
thread.start();
} else
notify();
}
synchronized Runnable nextTask(int maxWait) {
if (tasks.isEmpty()) {
try {
wait(maxWait);
} catch (InterruptedException e) {
// ignore -- we control the stack here and do not need to propagate it.
}
if (tasks.isEmpty()) {
thread = null;
return null;
}
}
return tasks.removeFirst();
}
}
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