View Javadoc

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  
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    final static SimpleLoggerFactory INSTANCE = new SimpleLoggerFactory();
42  
43    Map loggerMap;
44  
45    public SimpleLoggerFactory() {
46      loggerMap = new HashMap();
47    }
48  
49    /**
50     * Return an appropriate {@link SimpleLogger} instance by name.
51     */
52    public Logger getLogger(String name) {
53      Logger slogger = null;
54      // protect against concurrent access of the loggerMap
55      synchronized (this) {
56        slogger = (Logger) loggerMap.get(name);
57        if (slogger == null) {
58          slogger = new SimpleLogger(name);
59          loggerMap.put(name, slogger);
60        }
61      }
62      return slogger;
63    }
64  }