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Java > Open Source Codes > org > jboss > aspects > logging > InvocationLogInterceptor


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.logging;
23
24 import java.util.ArrayList JavaDoc;
25
26 /**
27  * An interceptor that tests whether logging should be done to
28  * the invocation response.
29  *
30  * @author <a HREF="mailto:adrian@jboss">Adrian Brock</a>.
31  * @version $Revision: 37406 $
32  */
33 public class InvocationLogInterceptor
34    implements org.jboss.aop.advice.Interceptor
35 {
36    // Constants -----------------------------------------------------
37
38    // Attributes ----------------------------------------------------
39
40    // Static --------------------------------------------------------
41
42    // Constructors --------------------------------------------------
43
44    // Public --------------------------------------------------------
45
46    // Interceptor Implementation ------------------------------------
47
48    public String JavaDoc getName()
49    {
50       return "InvocationLogInterceptor";
51    }
52
53    public Object JavaDoc invoke(org.jboss.aop.joinpoint.Invocation invocation)
54       throws Throwable JavaDoc
55    {
56       Object JavaDoc started = invocation.getMetaData(ThreadLocalAppender.LOG, ThreadLocalAppender.LOG);
57
58       ArrayList JavaDoc log = null;
59       if (started != null)
60       {
61          // Some earlier invocation started the logging
62 if (ThreadLocalAppender.getList() != null)
63             started = null;
64          else
65          {
66             // We are the first, start the logging
67 log = new ArrayList JavaDoc();
68             ThreadLocalAppender.setList(log);
69          }
70       }
71
72       try
73       {
74          // Perform the invocation and attach the log when we started it
75 Object JavaDoc response = invocation.invokeNext();
76          if (started != null)
77             invocation.addResponseAttachment(ThreadLocalAppender.LOG, log);
78          return response;
79       }
80       finally
81       {
82          // If we started the logging, stop it
83 if (started != null)
84             ThreadLocalAppender.setList(null);
85       }
86    }
87
88    // Y Overrides ---------------------------------------------------
89
90    // Protected -----------------------------------------------------
91
92    // Private -------------------------------------------------------
93
94    // Inner Classes -------------------------------------------------
95 }
96
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