Mercurial > hg > truffle
comparison 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> |
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date | Sat, 17 Dec 2011 19:59:18 +0100 |
parents | |
children | bc8527f3071c |
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3732:3e2e8b8abdaf | 3733:e233f5660da4 |
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1 /* | |
2 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved. | |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
22 */ | |
23 package com.sun.max.util; | |
24 | |
25 import java.util.*; | |
26 | |
27 /** | |
28 * Deferred Runnables. | |
29 * | |
30 * Creating a Deferrable either causes immediate execution of its 'run()' method | |
31 * or queues it for deferred execution later on when 'runAll()' is called. | |
32 */ | |
33 public abstract class Deferrable implements Runnable { | |
34 | |
35 public Deferrable(Queue queue) { | |
36 queue.handle(this); | |
37 } | |
38 | |
39 @Override | |
40 public String toString() { | |
41 return super.toString(); | |
42 } | |
43 | |
44 public static final class Queue { | |
45 | |
46 private List<Deferrable> deferrables; | |
47 | |
48 private Queue() { | |
49 } | |
50 | |
51 synchronized void handle(Deferrable deferrable) { | |
52 if (deferrables != null) { | |
53 deferrables.add(deferrable); | |
54 } else { | |
55 deferrable.run(); | |
56 } | |
57 } | |
58 | |
59 public synchronized void deferAll() { | |
60 deferrables = new LinkedList<Deferrable>(); | |
61 } | |
62 | |
63 public synchronized void runAll() { | |
64 while (deferrables != null) { | |
65 final List<Deferrable> oldDeferrables = this.deferrables; | |
66 this.deferrables = new LinkedList<Deferrable>(); | |
67 for (Deferrable deferrable : oldDeferrables) { | |
68 deferrable.run(); | |
69 } | |
70 if (oldDeferrables.isEmpty()) { | |
71 this.deferrables = null; | |
72 } | |
73 } | |
74 } | |
75 } | |
76 | |
77 public static Queue createRunning() { | |
78 return new Queue(); | |
79 } | |
80 | |
81 public static Queue createDeferred() { | |
82 final Queue queue = new Queue(); | |
83 queue.deferAll(); | |
84 return queue; | |
85 } | |
86 | |
87 public abstract static class Block implements Runnable { | |
88 public Block(Queue queue) { | |
89 queue.deferAll(); | |
90 run(); | |
91 queue.runAll(); | |
92 } | |
93 } | |
94 } |