Mercurial > hg > truffle
view graal/com.oracle.max.base/src/com/sun/max/util/Deferrable.java @ 3733:e233f5660da4
Added Java files from Maxine project.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
---|---|
date | Sat, 17 Dec 2011 19:59:18 +0100 |
parents | |
children | bc8527f3071c |
line wrap: on
line source
/* * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ 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. */ 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(); } } }