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 public Log4jLoggerFactory() {
46 loggerMap = new ConcurrentHashMap<String, Logger>();
47 }
48
49 /*
50 * (non-Javadoc)
51 *
52 * @see org.slf4j.ILoggerFactory#getLogger(java.lang.String)
53 */
54 public Logger getLogger(String name) {
55 Logger slf4jLogger = loggerMap.get(name);
56 if (slf4jLogger != null) {
57 return slf4jLogger;
58 } else {
59 org.apache.log4j.Logger log4jLogger;
60 if (name.equalsIgnoreCase(Logger.ROOT_LOGGER_NAME))
61 log4jLogger = LogManager.getRootLogger();
62 else
63 log4jLogger = LogManager.getLogger(name);
64
65 Logger newInstance = new Log4jLoggerAdapter(log4jLogger);
66 Logger oldInstance = loggerMap.putIfAbsent(name, newInstance);
67 return oldInstance == null ? newInstance : oldInstance;
68 }
69 }
70 }