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Java > Open Source Codes > org > jboss > aspects > ThreadbasedAspect


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;
23
24 import org.jboss.aop.joinpoint.FieldReadInvocation;
25 import org.jboss.aop.joinpoint.FieldWriteInvocation;
26
27 /**
28  * This aspect should be scoped PER_JOINPOINT
29  * It allows a field to be like a ThreadLocal
30  *
31  * @author <a HREF="mailto:bill@jboss.org">Bill Burke</a>
32  * @version $Revision: 37406 $
33  */

34 public class ThreadbasedAspect
35 {
36    private ThreadLocal JavaDoc threadbased = new ThreadLocal JavaDoc();
37
38    public Object JavaDoc access(FieldReadInvocation invocation) throws Throwable JavaDoc
39    {
40       // just in case we have a primitive, we can't return null
41
if (threadbased.get() == null) return invocation.invokeNext();
42       return threadbased.get();
43    }
44
45    public Object JavaDoc access(FieldWriteInvocation invocation) throws Throwable JavaDoc
46    {
47       threadbased.set(invocation.getValue());
48       return null;
49    }
50 }
51
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