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Pax Logging API Library is a collection of logging APIs from different libraries/facades. It supports SLF4J, Commons Logging, JULI Logging, Log4J1 API, Log4J2 API, JBoss Logging and Avalon APIs. Additionally, Pax Logging specific library is available as backend implementation with its specific configuration mechanisms, but it's not required.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.jbosslogging;

import java.util.Map;

import org.jboss.logging.Logger;
import org.jboss.logging.LoggerProvider;
import org.ops4j.pax.logging.PaxContext;
import org.ops4j.pax.logging.PaxLogger;
import org.ops4j.pax.logging.PaxLoggingManager;
import org.ops4j.pax.logging.PaxLoggingService;
import org.ops4j.pax.logging.internal.Activator;
import org.ops4j.pax.logging.spi.support.FallbackLogFactory;
import org.osgi.framework.FrameworkUtil;

/**
 * {@link LoggerProvider} bridging JBoss Logging to Pax Logging.
 */
public class PaxLoggingLoggerProvider implements LoggerProvider {

    private static PaxLoggingManager paxLogging;

    /** {@link PaxContext} used when {@link org.ops4j.pax.logging.PaxLoggingService} is not available */
    private static PaxContext m_defaultContext = new PaxContext();
    /** {@link PaxContext} obtained from {@link org.ops4j.pax.logging.PaxLoggingService} */
    private static PaxContext m_context;

    public static void setPaxLoggingManager(PaxLoggingManager manager) {
        paxLogging = manager;
    }

    @Override
    public Logger getLogger(String name) {
        PaxLogger paxLogger;
        if (paxLogging == null) {
            paxLogger = FallbackLogFactory.createFallbackLog(FrameworkUtil.getBundle(Logger.class), name);
        } else {
            paxLogger = paxLogging.getLogger(name, JBossLoggingLogger.JBOSS_LOGGING_FQCN);
        }
        JBossLoggingLogger logger = new JBossLoggingLogger(name, paxLogger);
        if (paxLogging == null) {
            // just add the logger which PaxLoggingManager need to be replaced.
            synchronized (Activator.m_loggers) {
                Activator.m_loggers.add(logger);
            }
        }
        return logger;
    }

    @Override
    public void clearMdc() {
        getContext().clear();
    }

    @Override
    public Object putMdc(String key, Object value) {
        Object previous = getMdc(key);
        getContext().put(key, value);
        return previous;
    }

    @Override
    public Object getMdc(String key) {
        return getContext().get(key);
    }

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

    @Override
    public Map getMdcMap() {
        return getContext().getCopyOfContextMap();
    }

    @Override
    public void clearNdc() {
        // not (yet) supported in pax-logging
    }

    @Override
    public String getNdc() {
        // not (yet) supported in pax-logging
        return null;
    }

    @Override
    public int getNdcDepth() {
        // not (yet) supported in pax-logging
        return 0;
    }

    @Override
    public String popNdc() {
        // not (yet) supported in pax-logging
        return null;
    }

    @Override
    public String peekNdc() {
        // not (yet) supported in pax-logging
        return null;
    }

    @Override
    public void pushNdc(String message) {
        // not (yet) supported in pax-logging
    }

    @Override
    public void setNdcMaxDepth(int maxDepth) {
        // not (yet) supported in pax-logging
    }

    private static PaxContext getContext() {
        PaxLoggingManager manager = PaxLoggingLoggerProvider.paxLogging;
        if (manager != null) {
            synchronized (PaxLoggingLoggerProvider.class) {
                PaxLoggingService service = manager.getPaxLoggingService();
                m_context = service != null ? service.getPaxContext() : null;
            }
        }
        return m_context != null ? m_context : m_defaultContext;
    }

}