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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.Map;
import org.slf4j.spi.MDCAdapter;
import org.osgi.framework.BundleContext;
import org.ops4j.pax.logging.PaxContext;
import org.ops4j.pax.logging.PaxLoggingManager;
import org.ops4j.pax.logging.OSGIPaxLoggingManager;

public class Slf4jMDCAdapter
    implements MDCAdapter
{

    private static PaxContext m_context;
    private static PaxContext m_defaultContext = new PaxContext();

    private static PaxLoggingManager m_paxLogging;
    public static void setBundleContext( BundleContext ctx )
    {
        m_paxLogging = new OSGIPaxLoggingManager( ctx );
        // We need to instruct all loggers to ensure the SimplePaxLoggingManager is replaced.
        m_paxLogging.open();
    }

    /**
      * For all the methods that operate against the context, return true if the MDC should use the PaxContext object from the PaxLoggingManager,
      * or if the logging manager is not set, or does not have its context available yet, use a default context local to this MDC.
      * @return m_context if the MDC should use the PaxContext object from the PaxLoggingManager,
      * or m_defaultContext if the logging manager is not set, or does not have its context available yet.
      */
    private static PaxContext getContext(){
        if( m_context==null && m_paxLogging!=null ){
            m_context=(m_paxLogging.getPaxLoggingService()!=null)?m_paxLogging.getPaxLoggingService().getPaxContext():null;
        }
        return m_context!=null?m_context:m_defaultContext;
    }

    public void put( String key, String val )
    {
        getContext().put(key, val);
    }

    public String get( String key )
    {
		Object value = null;
        return ( (value = getContext().get(key) ) != null ) ? value.toString() : null;
    }

    public void remove( String key )
    {
        getContext().remove(key);
    }

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

    public Map getCopyOfContextMap()
    {
        return getContext().getCopyOfContextMap();
    }

    public void setContextMap( Map contextMap )
    {
        getContext().setContextMap(contextMap);
    }

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