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.apache.commons.logging.LogFactory;
31 import org.slf4j.ILoggerFactory;
32 import org.slf4j.Logger;
33 import org.slf4j.helpers.Util;
34
35 /**
36 * JCLLoggerFactory is an implementation of {@link ILoggerFactory} returning the
37 * appropriately named {@link JCLLoggerAdapter} instance.
38 *
39 * @author Ceki Gülcü
40 */
41 public class JCLLoggerFactory implements ILoggerFactory {
42
43 private static final String JCL_DELEGATION_LOOP_URL = "http://www.slf4j.org/codes.html#jclDelegationLoop";
44
45 // check for delegation loops
46 static {
47 try {
48 Class.forName("org.apache.commons.logging.impl.SLF4JLogFactory");
49 String part1 = "Detected both jcl-over-slf4j.jar AND slf4j-jcl.jar on the class path, preempting StackOverflowError. ";
50 String part2 = "See also " + JCL_DELEGATION_LOOP_URL
51 + " for more details.";
52
53 Util.report(part1);
54 Util.report(part2);
55 throw new IllegalStateException(part1 + part2);
56 } catch (ClassNotFoundException e) {
57 // this is the good case
58 }
59 }
60
61 // key: name (String), value: a JCLLoggerAdapter;
62 Map loggerMap;
63
64 public JCLLoggerFactory() {
65 loggerMap = new HashMap();
66 }
67
68 /*
69 * (non-Javadoc)
70 *
71 * @see org.slf4j.ILoggerFactory#getLogger(java.lang.String)
72 */
73 public Logger getLogger(String name) {
74 Logger logger = null;
75 // protect against concurrent access of loggerMap
76 synchronized (this) {
77 logger = (Logger) loggerMap.get(name);
78 if (logger == null) {
79 org.apache.commons.logging.Log jclLogger = LogFactory.getLog(name);
80 logger = new JCLLoggerAdapter(jclLogger, name);
81 loggerMap.put(name, logger);
82 }
83 }
84 return logger;
85 }
86 }