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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.concurrent.ConcurrentHashMap;
28  import java.util.concurrent.ConcurrentMap;
29  
30  import org.apache.log4j.LogManager;
31  import org.slf4j.ILoggerFactory;
32  import org.slf4j.Logger;
33  
34  /**
35   * Log4jLoggerFactory is an implementation of {@link ILoggerFactory} returning
36   * the appropriate named {@link Log4jLoggerAdapter} instance.
37   * 
38   * @author Ceki Gülcü
39   */
40  public class Log4jLoggerFactory implements ILoggerFactory {
41  
42    // key: name (String), value: a Log4jLoggerAdapter;
43    ConcurrentMap<String, Logger> loggerMap;
44  
45  
46    public Log4jLoggerFactory() {
47      loggerMap = new ConcurrentHashMap<String, Logger>();
48    }
49  
50    /*
51     * (non-Javadoc)
52     * 
53     * @see org.slf4j.ILoggerFactory#getLogger(java.lang.String)
54     */
55    public Logger getLogger(String name) {
56      Logger slf4jLogger = loggerMap.get(name);
57      if (slf4jLogger != null) {
58        return slf4jLogger;
59      } else {
60        org.apache.log4j.Logger log4jLogger;
61        if(name.equalsIgnoreCase(Logger.ROOT_LOGGER_NAME))
62          log4jLogger = LogManager.getRootLogger();
63        else
64          log4jLogger = LogManager.getLogger(name);
65  
66        Logger newInstance = new Log4jLoggerAdapter(log4jLogger);
67        Logger oldInstance = loggerMap.putIfAbsent(name, newInstance);
68        return oldInstance == null ? newInstance : oldInstance;
69      }
70    }
71  }