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The Pax Logging API Library is to allow for the Pax Logging Service to be reloaded without stopping the many dependent bundles. It also contains the OSGi Log Service API and the Knopflerfish Log API.

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/**
 * Copyright (c) 2004-2011 QOS.ch
 * All rights reserved.
 *
 * Permission is hereby granted, free  of charge, to any person obtaining
 * a  copy  of this  software  and  associated  documentation files  (the
 * "Software"), to  deal in  the Software without  restriction, including
 * without limitation  the rights to  use, copy, modify,  merge, publish,
 * distribute,  sublicense, and/or sell  copies of  the Software,  and to
 * permit persons to whom the Software  is furnished to do so, subject to
 * the following conditions:
 *
 * The  above  copyright  notice  and  this permission  notice  shall  be
 * included in all copies or substantial portions of the Software.
 *
 * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
 * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
 * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */
package org.slf4j.helpers;

import org.slf4j.ILoggerFactory;
import org.slf4j.Logger;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

/**
 * SubstituteLoggerFactory manages instances of {@link SubstituteLogger}.
 *
 * @author Ceki Gülcü
 * @author Chetan Mehrotra
 */
public class SubstituteLoggerFactory implements ILoggerFactory {

    final ConcurrentMap loggers = new ConcurrentHashMap();

    public Logger getLogger(String name) {
        SubstituteLogger logger = loggers.get(name);
        if (logger == null) {
            logger = new SubstituteLogger(name);
            SubstituteLogger oldLogger = loggers.putIfAbsent(name, logger);
            if (oldLogger != null)
                logger = oldLogger;
        }
        return logger;
    }

    public List getLoggerNames() {
        return new ArrayList(loggers.keySet());
    }

    public List getLoggers() {
        return new ArrayList(loggers.values());
    }

    public void clear() {
        loggers.clear();
    }
}