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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 2006 Niclas Hedhman.
 *
 * Licensed  under the  Apache License,  Version 2.0  (the "License");
 * you may not use  this file  except in  compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed  under the  License is distributed on an "AS IS" BASIS,
 * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY KIND, either  express  or
 * implied.
 *
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.ops4j.pax.logging.slf4j;

import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.WeakHashMap;

import org.ops4j.pax.logging.OSGIPaxLoggingManager;
import org.ops4j.pax.logging.PaxLogger;
import org.ops4j.pax.logging.PaxLoggingManager;
import org.ops4j.pax.logging.internal.FallbackLogFactory;
import org.osgi.framework.BundleContext;
import org.slf4j.ILoggerFactory;
import org.slf4j.Logger;

public class Slf4jLoggerFactory
        implements ILoggerFactory
{

    private static PaxLoggingManager m_paxLogging;
    private static Map m_loggers;

    static
    {
        m_loggers = new WeakHashMap();
    }

    public static void setBundleContext(BundleContext context)
    {
        synchronized (m_loggers) {
            m_paxLogging = new OSGIPaxLoggingManager(context);
            // We need to instruct all loggers to ensure the SimplePaxLoggingManager is replaced.
            Set entrySet = m_loggers.entrySet();
            Iterator iterator = entrySet.iterator();
            while (iterator.hasNext())
            {
                Map.Entry entry = (Entry) iterator.next();
                String name = (String) entry.getValue();
                Slf4jLogger logger = (Slf4jLogger) entry.getKey();
                logger.setPaxLoggingManager(m_paxLogging, name);
            }
            m_paxLogging.open();
        }
    }

    /**
     * Releases any held resources and makes the class ready for garbage collection.
     */
    public static void release()
    {
    }

    /**
     * Return an appropriate {@link org.slf4j.Logger} instance as specified by the name parameter.
     * 
     * 
     * Null-valued name arguments are considered invalid.
     * 
     * 
     * Certain extremely simple logging systems, e.g. NOP, may always return the same logger instance regardless of the
     * requested name.
     * 
     * @param name the name of the Logger to return
     */
    public Logger getLogger(String name)
    {
        PaxLogger paxLogger;
        if (m_paxLogging == null)
        {
            paxLogger = FallbackLogFactory.createFallbackLog(null, name);
        }
        else
        {
            paxLogger = m_paxLogging.getLogger(name, Slf4jLogger.SLF4J_FQCN);
        }
        Slf4jLogger logger = new Slf4jLogger(name, paxLogger);
        if (m_paxLogging == null) {
            // just add the logger which PaxLoggingManager need to be replaced.
            synchronized (m_loggers) {
                m_loggers.put(logger, name);
            }
        }
        return logger;
    }

    /** Pax Logging internal method. Should never be used directly. */
    public static void dispose()
    {
        m_paxLogging.close();
        m_paxLogging.dispose();
        m_paxLogging = null;
    }
}