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.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; 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 + " for more details."; 51 52 Util.report(part1); 53 Util.report(part2); 54 throw new IllegalStateException(part1 + part2); 55 } catch (ClassNotFoundException e) { 56 // this is the good case 57 } 58 } 59 60 // key: name (String), value: a JCLLoggerAdapter; 61 ConcurrentMap<String, Logger> loggerMap; 62 JCLLoggerFactory()63 public JCLLoggerFactory() { 64 loggerMap = new ConcurrentHashMap<String, Logger>(); 65 } 66 67 /* 68 * (non-Javadoc) 69 * 70 * @see org.slf4j.ILoggerFactory#getLogger(java.lang.String) 71 */ getLogger(String name)72 public Logger getLogger(String name) { 73 Logger slf4jLogger = loggerMap.get(name); 74 if (slf4jLogger != null) { 75 return slf4jLogger; 76 } else { 77 org.apache.commons.logging.Log jclLogger = LogFactory.getLog(name); 78 Logger newInstance = new JCLLoggerAdapter(jclLogger, name); 79 Logger oldInstance = loggerMap.putIfAbsent(name, newInstance); 80 return oldInstance == null ? newInstance : oldInstance; 81 } 82 } 83 } 84