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Java > Open Source Codes > org > jboss > aspects > patterns > readwritelock > ReadWriteLockAspect


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.patterns.readwritelock;
23
24
25 import EDU.oswego.cs.dl.util.concurrent.ReadWriteLock;
26 import EDU.oswego.cs.dl.util.concurrent.ReentrantWriterPreferenceReadWriteLock;
27 import org.jboss.aop.joinpoint.MethodInvocation;
28
29 /**
30  * @version <tt>$Revision: 37406 $</tt>
31  * @author <a HREF="mailto:chussenet@yahoo.com">{Claude Hussenet Independent Consultant}</a>.
32  */
33 public class ReadWriteLockAspect
34 {
35
36    private ReadWriteLock readWriteLock = new ReentrantWriterPreferenceReadWriteLock();
37
38    public ReadWriteLockAspect()
39    {
40
41    }
42
43    public Object JavaDoc readLockMethod(MethodInvocation invocation) throws Throwable JavaDoc
44    {
45       Object JavaDoc result=null;
46
47       try
48       {
49          readWriteLock.readLock().acquire();
50          result= invocation.invokeNext();
51       }
52       finally
53       {
54         readWriteLock.readLock().release();
55       }
56       return result;
57    }
58
59    public Object JavaDoc writeLockMethod(MethodInvocation invocation) throws Throwable JavaDoc
60    {
61       Object JavaDoc result = null;
62
63       try
64       {
65          readWriteLock.writeLock().acquire();
66          result= invocation.invokeNext();
67       }
68       finally
69       {
70         readWriteLock.writeLock().release();
71       }
72      return result;
73    }
74
75 }
76
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