1 /*
2 * Copyright (c) 2004-2005 SLF4J.ORG
3 * Copyright (c) 2004-2005 QOS.ch
4 *
5 * All rights reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining
8 * a copy of this software and associated documentation files (the
9 * "Software"), to deal in the Software without restriction, including
10 * without limitation the rights to use, copy, modify, merge, publish,
11 * distribute, and/or sell copies of the Software, and to permit persons
12 * to whom the Software is furnished to do so, provided that the above
13 * copyright notice(s) and this permission notice appear in all copies of
14 * the Software and that both the above copyright notice(s) and this
15 * permission notice appear in supporting documentation.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
20 * OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
21 * HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY
22 * SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER
23 * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
24 * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
25 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
26 *
27 * Except as contained in this notice, the name of a copyright holder
28 * shall not be used in advertising or otherwise to promote the sale, use
29 * or other dealings in this Software without prior written authorization
30 * of the copyright holder.
31 *
32 */
33
34 package org.slf4j.impl;
35
36 import java.util.HashMap;
37 import java.util.Map;
38
39 import org.apache.commons.logging.LogFactory;
40 import org.slf4j.ILoggerFactory;
41 import org.slf4j.Logger;
42 import org.slf4j.helpers.Util;
43
44 /**
45 * JCLLoggerFactory is an implementation of {@link ILoggerFactory} returning the
46 * appropriately named {@link JCLLoggerAdapter} instance.
47 *
48 * @author Ceki Gülcü
49 */
50 public class JCLLoggerFactory implements ILoggerFactory {
51
52 private static final String JCL_DELEGATION_LOOP_URL = "http://www.slf4j.org/codes.html#jclDelegationLoop";
53
54 // check for delegation loops
55 static {
56 try {
57 Class.forName("org.apache.commons.logging.impl.SLF4JLogFactory");
58 String part1 = "Detected both jcl-over-slf4j.jar AND slf4j-jcl.jar on the class path, preempting StackOverflowError. ";
59 String part2 = "See also " + JCL_DELEGATION_LOOP_URL
60 + " for more details.";
61
62 Util.report(part1);
63 Util.report(part2);
64 throw new IllegalStateException(part1 + part2);
65 } catch (ClassNotFoundException e) {
66 // this is the good case
67 }
68 }
69
70 // key: name (String), value: a JCLLoggerAdapter;
71 Map loggerMap;
72
73 public JCLLoggerFactory() {
74 loggerMap = new HashMap();
75 }
76
77 /*
78 * (non-Javadoc)
79 *
80 * @see org.slf4j.ILoggerFactory#getLogger(java.lang.String)
81 */
82 public Logger getLogger(String name) {
83 Logger logger = null;
84 // protect against concurrent access of loggerMap
85 synchronized (this) {
86 logger = (Logger) loggerMap.get(name);
87 if (logger == null) {
88 org.apache.commons.logging.Log jclLogger = LogFactory.getLog(name);
89 logger = new JCLLoggerAdapter(jclLogger, name);
90 loggerMap.put(name, logger);
91 }
92 }
93 return logger;
94 }
95 }