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1   /**
2    * Copyright (c) 2004-2011 QOS.ch
3    * All rights reserved.
4    *
5    * Permission is hereby granted, free  of charge, to any person obtaining
6    * a  copy  of this  software  and  associated  documentation files  (the
7    * "Software"), to  deal in  the Software without  restriction, including
8    * without limitation  the rights to  use, copy, modify,  merge, publish,
9    * distribute,  sublicense, and/or sell  copies of  the Software,  and to
10   * permit persons to whom the Software  is furnished to do so, subject to
11   * the following conditions:
12   *
13   * The  above  copyright  notice  and  this permission  notice  shall  be
14   * included in all copies or substantial portions of the Software.
15   *
16   * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
17   * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
18   * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
19   * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
20   * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21   * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
22   * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23   *
24   */
25  package org.slf4j.impl;
26  
27  import java.util.HashMap;
28  import java.util.Map;
29  import java.util.concurrent.ConcurrentHashMap;
30  import java.util.concurrent.ConcurrentMap;
31  
32  import org.apache.log4j.LogManager;
33  import org.slf4j.ILoggerFactory;
34  import org.slf4j.Logger;
35  
36  /**
37   * Log4jLoggerFactory is an implementation of {@link ILoggerFactory} returning
38   * the appropriate named {@link Log4jLoggerAdapter} instance.
39   * 
40   * @author Ceki Gülcü
41   */
42  public class Log4jLoggerFactory implements ILoggerFactory {
43  
44    // key: name (String), value: a Log4jLoggerAdapter;
45    ConcurrentMap<String, Logger> loggerMap;
46  
47  
48    public Log4jLoggerFactory() {
49      loggerMap = new ConcurrentHashMap<String, Logger>();
50    }
51  
52    /*
53     * (non-Javadoc)
54     * 
55     * @see org.slf4j.ILoggerFactory#getLogger(java.lang.String)
56     */
57    public Logger getLogger(String name) {
58      Logger slf4jLogger = loggerMap.get(name);
59      if (slf4jLogger != null) {
60        return slf4jLogger;
61      } else {
62        org.apache.log4j.Logger log4jLogger;
63        if(name.equalsIgnoreCase(Logger.ROOT_LOGGER_NAME))
64          log4jLogger = LogManager.getRootLogger();
65        else
66          log4jLogger = LogManager.getLogger(name);
67  
68        Logger newInstance = new Log4jLoggerAdapter(log4jLogger);
69        Logger oldInstance = loggerMap.putIfAbsent(name, newInstance);
70        return oldInstance == null ? newInstance : oldInstance;
71      }
72    }
73  }