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25 package org.slf4j.impl;
26
27 import java.util.concurrent.ConcurrentHashMap;
28 import java.util.concurrent.ConcurrentMap;
29
30 import org.apache.commons.logging.LogFactory;
31 import org.slf4j.ILoggerFactory;
32 import org.slf4j.Logger;
33 import org.slf4j.helpers.Util;
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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
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
58 }
59 }
60
61
62 ConcurrentMap<String, Logger> loggerMap;
63
64 public JCLLoggerFactory() {
65 loggerMap = new ConcurrentHashMap<String, Logger>();
66 }
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73 public Logger getLogger(String name) {
74 Logger slf4jLogger = loggerMap.get(name);
75 if (slf4jLogger != null) {
76 return slf4jLogger;
77 } else {
78 org.apache.commons.logging.Log jclLogger = LogFactory.getLog(name);
79 Logger newInstance = new JCLLoggerAdapter(jclLogger, name);
80 Logger oldInstance = loggerMap.putIfAbsent(name, newInstance);
81 return oldInstance == null ? newInstance : oldInstance;
82 }
83 }
84 }