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.simple;
026
027import java.util.concurrent.ConcurrentHashMap;
028import java.util.concurrent.ConcurrentMap;
029
030import org.slf4j.Logger;
031import org.slf4j.ILoggerFactory;
032
033/**
034 * An implementation of {@link ILoggerFactory} which always returns
035 * {@link SimpleLogger} instances.
036 * 
037 * @author Ceki Gülcü
038 */
039public class SimpleLoggerFactory implements ILoggerFactory {
040
041    ConcurrentMap<String, Logger> loggerMap;
042
043    public SimpleLoggerFactory() {
044        loggerMap = new ConcurrentHashMap<String, Logger>();
045        SimpleLogger.lazyInit();
046    }
047
048    /**
049     * Return an appropriate {@link SimpleLogger} instance by name.
050     */
051    public Logger getLogger(String name) {
052        Logger simpleLogger = loggerMap.get(name);
053        if (simpleLogger != null) {
054            return simpleLogger;
055        } else {
056            Logger newInstance = new SimpleLogger(name);
057            Logger oldInstance = loggerMap.putIfAbsent(name, newInstance);
058            return oldInstance == null ? newInstance : oldInstance;
059        }
060    }
061
062    /**
063     * Clear the internal logger cache.
064     *
065     * This method is intended to be called by classes (in the same package) for
066     * testing purposes. This method is internal. It can be modified, renamed or
067     * removed at any time without notice.
068     *
069     * You are strongly discouraged from calling this method in production code.
070     */
071    void reset() {
072        loggerMap.clear();
073    }
074}