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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.slf4j.Logger;
31  import org.slf4j.ILoggerFactory;
32  
33  /**
34   * An implementation of {@link ILoggerFactory} which always returns
35   * {@link SimpleLogger} instances.
36   * 
37   * @author Ceki Gülcü
38   */
39  public class SimpleLoggerFactory implements ILoggerFactory {
40  
41      ConcurrentMap<String, Logger> loggerMap;
42  
43      public SimpleLoggerFactory() {
44          loggerMap = new ConcurrentHashMap<String, Logger>();
45      }
46  
47      /**
48       * Return an appropriate {@link SimpleLogger} instance by name.
49       */
50      public Logger getLogger(String name) {
51          Logger simpleLogger = loggerMap.get(name);
52          if (simpleLogger != null) {
53              return simpleLogger;
54          } else {
55              Logger newInstance = new SimpleLogger(name);
56              Logger oldInstance = loggerMap.putIfAbsent(name, newInstance);
57              return oldInstance == null ? newInstance : oldInstance;
58          }
59      }
60  
61      /**
62       * Clear the internal logger cache.
63       *
64       * This method is intended to be called by classes (in the same package) for
65       * testing purposes. This method is internal. It can be modified, renamed or
66       * removed at any time without notice.
67       *
68       * You are strongly discouraged from calling this method in production code.
69       */
70      void reset() {
71          loggerMap.clear();
72      }
73  }