    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.impl;
    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 G&uuml;lc&uuml;
    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}