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.apache.commons.logging.LogFactory;
33 import org.slf4j.ILoggerFactory;
34 import org.slf4j.Logger;
35 import org.slf4j.helpers.Util;
36
37 /**
38 * JCLLoggerFactory is an implementation of {@link ILoggerFactory} returning the
39 * appropriately named {@link JCLLoggerAdapter} instance.
40 *
41 * @author Ceki Gülcü
42 */
43 public class JCLLoggerFactory implements ILoggerFactory {
44
45 private static final String JCL_DELEGATION_LOOP_URL = "http://www.slf4j.org/codes.html#jclDelegationLoop";
46
47 // check for delegation loops
48 static {
49 try {
50 Class.forName("org.apache.commons.logging.impl.SLF4JLogFactory");
51 String part1 = "Detected both jcl-over-slf4j.jar AND slf4j-jcl.jar on the class path, preempting StackOverflowError. ";
52 String part2 = "See also " + JCL_DELEGATION_LOOP_URL
53 + " for more details.";
54
55 Util.report(part1);
56 Util.report(part2);
57 throw new IllegalStateException(part1 + part2);
58 } catch (ClassNotFoundException e) {
59 // this is the good case
60 }
61 }
62
63 // key: name (String), value: a JCLLoggerAdapter;
64 ConcurrentMap<String, Logger> loggerMap;
65
66 public JCLLoggerFactory() {
67 loggerMap = new ConcurrentHashMap<String, Logger>();
68 }
69
70 /*
71 * (non-Javadoc)
72 *
73 * @see org.slf4j.ILoggerFactory#getLogger(java.lang.String)
74 */
75 public Logger getLogger(String name) {
76 Logger slf4jLogger = loggerMap.get(name);
77 if (slf4jLogger != null) {
78 return slf4jLogger;
79 } else {
80 org.apache.commons.logging.Log jclLogger = LogFactory.getLog(name);
81 Logger newInstance = new JCLLoggerAdapter(jclLogger, name);
82 Logger oldInstance = loggerMap.putIfAbsent(name, newInstance);
83 return oldInstance == null ? newInstance : oldInstance;
84 }
85 }
86 }