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.log4j.LogManager; 33 import org.slf4j.ILoggerFactory; 34 import org.slf4j.Logger; 35 36 /** 37 * Log4jLoggerFactory is an implementation of {@link ILoggerFactory} returning 38 * the appropriate named {@link Log4jLoggerAdapter} instance. 39 * 40 * @author Ceki Gülcü 41 */ 42 public class Log4jLoggerFactory implements ILoggerFactory { 43 44 // key: name (String), value: a Log4jLoggerAdapter; 45 ConcurrentMap<String, Logger> loggerMap; 46 47 48 public Log4jLoggerFactory() { 49 loggerMap = new ConcurrentHashMap<String, Logger>(); 50 } 51 52 /* 53 * (non-Javadoc) 54 * 55 * @see org.slf4j.ILoggerFactory#getLogger(java.lang.String) 56 */ 57 public Logger getLogger(String name) { 58 Logger slf4jLogger = loggerMap.get(name); 59 if (slf4jLogger != null) { 60 return slf4jLogger; 61 } else { 62 org.apache.log4j.Logger log4jLogger; 63 if(name.equalsIgnoreCase(Logger.ROOT_LOGGER_NAME)) 64 log4jLogger = LogManager.getRootLogger(); 65 else 66 log4jLogger = LogManager.getLogger(name); 67 68 Logger newInstance = new Log4jLoggerAdapter(log4jLogger); 69 Logger oldInstance = loggerMap.putIfAbsent(name, newInstance); 70 return oldInstance == null ? newInstance : oldInstance; 71 } 72 } 73 }