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Java > Open Source Codes > org > jboss > aspects > asynch > FutureProxy


1 /*
2   * JBoss, Home of Professional Open Source
3   * Copyright 2005, JBoss Inc., and individual contributors as indicated
4   * by the @authors tag. See the copyright.txt in the distribution for a
5   * full listing of individual contributors.
6   *
7   * This is free software; you can redistribute it and/or modify it
8   * under the terms of the GNU Lesser General Public License as
9   * published by the Free Software Foundation; either version 2.1 of
10   * the License, or (at your option) any later version.
11   *
12   * This software is distributed in the hope that it will be useful,
13   * but WITHOUT ANY WARRANTY; without even the implied warranty of
14   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15   * Lesser General Public License for more details.
16   *
17   * You should have received a copy of the GNU Lesser General Public
18   * License along with this software; if not, write to the Free
19   * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20   * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21   */
22 package org.jboss.aspects.asynch;
23
24 import java.lang.reflect.InvocationTargetException JavaDoc;
25
26 /**
27  * Comment
28  *
29  * @author <a HREF="mailto:bill@jboss.org">Bill Burke</a>
30  * @version $Revision: 37406 $
31  */
32 public class FutureProxy implements Future
33 {
34    private Future delegate;
35    private boolean released = false;
36
37    public void setDelegate(Future delegate)
38    {
39       synchronized (this)
40       {
41          this.delegate = delegate;
42          if (released) delegate.release();
43          this.notifyAll();
44       }
45    }
46
47    public void release()
48    {
49       synchronized (this)
50       {
51          if (delegate == null)
52          {
53             released = true;
54             return;
55          }
56       }
57       delegate.release();
58    }
59
60    public Object JavaDoc get() throws InterruptedException JavaDoc, InvocationTargetException JavaDoc
61    {
62       synchronized (this)
63       {
64          if (delegate == null)
65             this.wait();
66          if (delegate == null) throw new RuntimeException JavaDoc("Failed to get delegate and timed out");
67          return delegate.get();
68       }
69    }
70
71    public Object JavaDoc get(long milliseconds) throws TimeoutException, InterruptedException JavaDoc, InvocationTargetException JavaDoc
72    {
73       synchronized (this)
74       {
75          if (delegate == null)
76          {
77             this.wait(milliseconds);
78             if (delegate == null) throw new TimeoutException("Failed to get delegate and timed out");
79          }
80       }
81       return delegate.get(milliseconds);
82    }
83
84    public boolean isDone()
85    {
86       return delegate == null || delegate.isDone();
87    }
88
89 }
90
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