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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.slf4j.Logger;
33  import org.slf4j.ILoggerFactory;
34  
35  /**
36   * An implementation of {@link ILoggerFactory} which always returns
37   * {@link SimpleLogger} instances.
38   * 
39   * @author Ceki Gülcü
40   */
41  public class SimpleLoggerFactory implements ILoggerFactory {
42  
43    ConcurrentMap<String, Logger> loggerMap;
44  
45    public SimpleLoggerFactory() {
46      loggerMap = new ConcurrentHashMap<String, Logger>();
47    }
48  
49    /**
50     * Return an appropriate {@link SimpleLogger} instance by name.
51     */
52    public Logger getLogger(String name) {
53      Logger simpleLogger = loggerMap.get(name);
54      if (simpleLogger != null) {
55        return simpleLogger;
56      } else {
57        Logger newInstance = new SimpleLogger(name);
58        Logger oldInstance = loggerMap.putIfAbsent(name, newInstance);
59        return oldInstance == null ? newInstance : oldInstance;
60      }
61    }
62  
63    /**
64     * Clear the internal logger cache.
65     *
66     * This method is intended to be called by classes (in the same package) for
67     * testing purposes. This method is internal. It can be modified, renamed or
68     * removed at any time without notice.
69     *
70     * You are strongly discouraged from calling this method in production code.
71     */
72    void reset() {
73      loggerMap.clear();
74    }
75  }