ThreadMDCConverter


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.logging.layout;
23  
24  import org.apache.log4j.MDC;
25  import org.apache.log4j.helpers.FormattingInfo;
26  import org.apache.log4j.helpers.PatternConverter;
27  import org.apache.log4j.spi.LoggingEvent;
28  
29  /** A PatternConverter that uses the current thread MDC rather than the
30   * LoggingEvent MDC value.
31   *
32   * @author Scott.Stark@jboss.org
33   * @version $Revision: 1958 $
34   */
35  public class ThreadMDCConverter extends PatternConverter
36  {
37     private String   key;
38     /** Creates a new instance of ThreadMDCPatternConverter */
39     public ThreadMDCConverter(FormattingInfo formattingInfo, String   key)
40     {
41        super(formattingInfo);
42        this.key = key;
43     }
44  
45     protected String   convert(LoggingEvent loggingEvent)
46     {
47        Object   val = MDC.get(key);
48        String   strVal = null;
49        if( val != null )
50           strVal = val.toString();
51        return strVal;
52     }
53  
54  }
55
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