001/**
002 * Copyright (c) 2004-2011 QOS.ch
003 * All rights reserved.
004 *
005 * Permission is hereby granted, free  of charge, to any person obtaining
006 * a  copy  of this  software  and  associated  documentation files  (the
007 * "Software"), to  deal in  the Software without  restriction, including
008 * without limitation  the rights to  use, copy, modify,  merge, publish,
009 * distribute,  sublicense, and/or sell  copies of  the Software,  and to
010 * permit persons to whom the Software  is furnished to do so, subject to
011 * the following conditions:
012 *
013 * The  above  copyright  notice  and  this permission  notice  shall  be
014 * included in all copies or substantial portions of the Software.
015 *
016 * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
017 * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
018 * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
019 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
020 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
021 * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
022 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
023 *
024 */
025package org.slf4j.jul;
026
027import org.slf4j.Logger;
028import org.slf4j.ILoggerFactory;
029
030import java.util.concurrent.ConcurrentHashMap;
031import java.util.concurrent.ConcurrentMap;
032
033/**
034 * JDK14LoggerFactory is an implementation of {@link ILoggerFactory} returning
035 * the appropriately named {@link JDK14LoggerAdapter} instance.
036 * 
037 * @author Ceki Gülcü
038 */
039public class JDK14LoggerFactory implements ILoggerFactory {
040
041    // key: name (String), value: a JDK14LoggerAdapter;
042    ConcurrentMap<String, Logger> loggerMap;
043
044    /**
045     * the root logger is called "" in JUL
046     */
047    private static String JUL_ROOT_LOGGER_NAME = "";
048    
049    public JDK14LoggerFactory() {
050        loggerMap = new ConcurrentHashMap<>();
051        // ensure jul initialization. see SLF4J-359
052        // note that call to java.util.logging.LogManager.getLogManager() fails on the Google App Engine platform. See
053        // SLF4J-363
054        java.util.logging.Logger.getLogger("");
055    }
056
057    /*
058     * (non-Javadoc)
059     * 
060     * @see org.slf4j.ILoggerFactory#getLogger(java.lang.String)
061     */
062    public Logger getLogger(String name) {
063        // the root logger is called "" in JUL
064        if (name.equalsIgnoreCase(Logger.ROOT_LOGGER_NAME)) {
065            name = JUL_ROOT_LOGGER_NAME;
066        }
067
068        Logger slf4jLogger = loggerMap.get(name);
069        if (slf4jLogger != null)
070            return slf4jLogger;
071        else {
072            java.util.logging.Logger julLogger = java.util.logging.Logger.getLogger(name);
073            Logger newInstance = new JDK14LoggerAdapter(julLogger);
074            Logger oldInstance = loggerMap.putIfAbsent(name, newInstance);
075            return oldInstance == null ? newInstance : oldInstance;
076        }
077    }
078}