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/*
* Copyright (c) 2007 Sun Microsystems, Inc. All rights reserved.
*
* Sun Microsystems, Inc. has intellectual property rights relating to technology embodied in the product
* that is described in this document. In particular, and without limitation, these intellectual property
* rights may include one or more of the U.S. patents listed at http://www.sun.com/patents and one or
* more additional patents or pending patent applications in the U.S. and in other countries.
*
* U.S. Government Rights - Commercial software. Government users are subject to the Sun
* Microsystems, Inc. standard license agreement and applicable provisions of the FAR and its
* supplements.
*
* Use is subject to license terms. Sun, Sun Microsystems, the Sun logo, Java and Solaris are trademarks or
* registered trademarks of Sun Microsystems, Inc. in the U.S. and other countries. All SPARC trademarks
* are used under license and are trademarks or registered trademarks of SPARC International, Inc. in the
* U.S. and other countries.
*
* UNIX is a registered trademark in the U.S. and other countries, exclusively licensed through X/Open
* Company, Ltd.
*/
package com.sun.max.util;
import java.util.*;
/**
* Deferred Runnables.
*
* Creating a Deferrable either causes immediate execution of its 'run()' method
* or queues it for deferred execution later on when 'runAll()' is called.
*
* @author Bernd Mathiske
*/
public abstract class Deferrable implements Runnable {
public Deferrable(Queue queue) {
queue.handle(this);
}
@Override
public String toString() {
return super.toString();
}
public static final class Queue {
private List<Deferrable> deferrables;
private Queue() {
}
synchronized void handle(Deferrable deferrable) {
if (deferrables != null) {
deferrables.add(deferrable);
} else {
deferrable.run();
}
}
public synchronized void deferAll() {
deferrables = new LinkedList<Deferrable>();
}
public synchronized void runAll() {
while (deferrables != null) {
final List<Deferrable> oldDeferrables = this.deferrables;
this.deferrables = new LinkedList<Deferrable>();
for (Deferrable deferrable : oldDeferrables) {
deferrable.run();
}
if (oldDeferrables.isEmpty()) {
this.deferrables = null;
}
}
}
}
public static Queue createRunning() {
return new Queue();
}
public static Queue createDeferred() {
final Queue queue = new Queue();
queue.deferAll();
return queue;
}
public abstract static class Block implements Runnable {
public Block(Queue queue) {
queue.deferAll();
run();
queue.runAll();
}
}
}