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 */ 25package org.slf4j.impl; 26 27import java.util.concurrent.ConcurrentHashMap; 28import java.util.concurrent.ConcurrentMap; 29 30import org.apache.log4j.LogManager; 31import org.slf4j.ILoggerFactory; 32import org.slf4j.Logger; 33 34/** 35 * Log4jLoggerFactory is an implementation of {@link ILoggerFactory} returning 36 * the appropriate named {@link Log4jLoggerAdapter} instance. 37 * 38 * @author Ceki Gülcü 39 */ 40public class Log4jLoggerFactory implements ILoggerFactory { 41 42 // key: name (String), value: a Log4jLoggerAdapter; 43 ConcurrentMap<String, Logger> loggerMap; 44 45 public Log4jLoggerFactory() { 46 loggerMap = new ConcurrentHashMap<String, Logger>(); 47 } 48 49 /* 50 * (non-Javadoc) 51 * 52 * @see org.slf4j.ILoggerFactory#getLogger(java.lang.String) 53 */ 54 public Logger getLogger(String name) { 55 Logger slf4jLogger = loggerMap.get(name); 56 if (slf4jLogger != null) { 57 return slf4jLogger; 58 } else { 59 org.apache.log4j.Logger log4jLogger; 60 if (name.equalsIgnoreCase(Logger.ROOT_LOGGER_NAME)) 61 log4jLogger = LogManager.getRootLogger(); 62 else 63 log4jLogger = LogManager.getLogger(name); 64 65 Logger newInstance = new Log4jLoggerAdapter(log4jLogger); 66 Logger oldInstance = loggerMap.putIfAbsent(name, newInstance); 67 return oldInstance == null ? newInstance : oldInstance; 68 } 69 } 70} 71