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Java > Open Source Codes > net > sf > retrotranslator > runtime > java > lang > _Thread


1 /***
2  * Retrotranslator: a Java bytecode transformer that translates Java classes
3  * compiled with JDK 5.0 into classes that can be run on JVM 1.4.
4  *
5  * Copyright (c) 2005 - 2007 Taras Puchko
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  * notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  * notice, this list of conditions and the following disclaimer in the
15  * documentation and/or other materials provided with the distribution.
16  * 3. Neither the name of the copyright holders nor the names of its
17  * contributors may be used to endorse or promote products derived from
18  * this software without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
30  * THE POSSIBILITY OF SUCH DAMAGE.
31  */
32 package net.sf.retrotranslator.runtime.java.lang;
33
34 import net.sf.retrotranslator.runtime.impl.WeakIdentityTable;
35
36 /**
37  * @author Taras Puchko
38  */
39 public class _Thread {
40
41     private static final StackTraceElement JavaDoc[] EMPTY_STACK_TRACE = new StackTraceElement JavaDoc[0];
42
43     private static final WeakIdentityTable<Thread JavaDoc, _Thread> threads =
44             new WeakIdentityTable<Thread JavaDoc, _Thread>() {
45                 protected _Thread initialValue() {
46                     return new _Thread();
47                 }
48             };
49
50     private static long lastId;
51
52     private volatile long id;
53
54     public static StackTraceElement JavaDoc[] getStackTrace(Thread JavaDoc thread) {
55         return thread == Thread.currentThread() ? getStackTrace() : EMPTY_STACK_TRACE;
56     }
57
58     public static long getId(Thread JavaDoc thread) {
59         return threads.obtain(thread).getId();
60     }
61
62     private static StackTraceElement JavaDoc[] getStackTrace() {
63         return new Throwable JavaDoc().getStackTrace();
64     }
65
66     private long getId() {
67         if (id == 0) {
68             synchronized (threads) {
69                 while (id == 0) {
70                     id = ++lastId;
71                 }
72             }
73         }
74         return id;
75     }
76
77 }
78
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