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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;
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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
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
60 }
61 }
62
63
64 ConcurrentMap<String, Logger> loggerMap;
65
66 public JCLLoggerFactory() {
67 loggerMap = new ConcurrentHashMap<String, Logger>();
68 }
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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 }