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1   /*
2    * Copyright 1999,2004 The Apache Software Foundation.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * 
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package jgroup.util;
18  
19  import org.apache.log4j.ULogger;
20  import org.apache.log4j.pattern.LoggingEventPatternConverter;
21  import org.apache.log4j.spi.LoggingEvent;
22  
23  /**
24   * Return the events thread (usually the current thread) in a StringBuffer.
25   * This buffer is recycled!
26   * 
27   * @author Ceki Gülcü
28   * @author Hein Meling
29   */
30  public class ThreadIdPatternConverter 
31    extends LoggingEventPatternConverter 
32  {
33  
34    /**
35     * Singleton.
36     */
37    private static final ThreadIdPatternConverter INSTANCE =
38      new ThreadIdPatternConverter();
39  
40    /**
41     * private constructor
42     */
43    private ThreadIdPatternConverter() 
44    {
45      super("tid", "tid");
46    }
47  
48    /**
49     * Obtains an instance of ThreadIdPatternConverter.
50     * @param options
51     * @param logger
52     * @return
53     */
54    public static ThreadIdPatternConverter newInstance(
55        final String[] options, final ULogger logger) {
56        return INSTANCE;
57      }
58    
59    /* (non-Javadoc)
60     * @see org.apache.log4j.pattern.LoggingEventPatternConverter#format(
61     * org.apache.log4j.spi.LoggingEvent, java.lang.StringBuffer)
62     */
63    @Override
64    public void format(LoggingEvent event, StringBuffer toAppendTo)
65    {
66      toAppendTo.append(Thread.currentThread().getId());
67    }
68  
69  } // END ThreadIdPatternConverter