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The Netty project is an effort to provide an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

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/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project 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.jboss.netty.logging;

import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
import org.osgi.service.log.LogService;
import org.osgi.util.tracker.ServiceTracker;

/**
 * Logger factory which creates an OSGi
 * {@link LogService} logger.
 */
public class OsgiLoggerFactory extends InternalLoggerFactory {

    private final ServiceTracker logServiceTracker;
    private final InternalLoggerFactory fallback;
    volatile LogService logService;

    public OsgiLoggerFactory(BundleContext ctx) {
        this(ctx, null);
    }

    public OsgiLoggerFactory(BundleContext ctx, InternalLoggerFactory fallback) {
        if (ctx == null) {
            throw new NullPointerException("ctx");
        }
        if (fallback == null) {
            fallback = InternalLoggerFactory.getDefaultFactory();
            if (fallback instanceof OsgiLoggerFactory) {
                fallback = new JdkLoggerFactory();
            }
        }

        this.fallback = fallback;
        logServiceTracker = new ServiceTracker(
                ctx, "org.osgi.service.log.LogService", null) {
                    @Override
                    public Object addingService(ServiceReference reference) {
                        LogService service = (LogService) super.addingService(reference);
                        logService = service;
                        return service;
                    }

                    @Override
                    public void removedService(ServiceReference reference,
                            Object service) {
                        logService = null;
                    }
        };
        logServiceTracker.open();
    }

    public InternalLoggerFactory getFallback() {
        return fallback;
    }

    public LogService getLogService() {
        return logService;
    }

    public void destroy() {
        logService = null;
        logServiceTracker.close();
    }

    @Override
    public InternalLogger newInstance(String name) {
        return new OsgiLogger(this, name, fallback.newInstance(name));
    }
}