RemoteOSGiActivator.java

/* Copyright (c) 2006-2009 Jan S. Rellermeyer
 * Systems Group,
 * Department of Computer Science, ETH Zurich.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *    - Redistributions of source code must retain the above copyright notice,
 *      this list of conditions and the following disclaimer.
 *    - Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *    - Neither the name of ETH Zurich nor the names of its contributors may be
 *      used to endorse or promote products derived from this software without
 *      specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package ch.ethz.iks.r_osgi.impl;

import java.util.Dictionary;
import java.util.Hashtable;

import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
import org.osgi.service.log.LogService;

import ch.ethz.iks.r_osgi.RemoteOSGiService;
import ch.ethz.iks.r_osgi.Remoting;
import ch.ethz.iks.r_osgi.channels.NetworkChannelFactory;

/**
 * the OSGi BundleActivator.
 * 
 * @author Jan S. Rellermeyer, ETH Zurich
 * @since 0.1
 */
public final class RemoteOSGiActivator implements BundleActivator {

	/**
	 * the Remote OSGi service instance.
	 */
	private RemoteOSGiServiceImpl remoting;

	private static RemoteOSGiActivator instance;

	private BundleContext context;

	static RemoteOSGiActivator getActivator() {
		return instance;
	}

	BundleContext getContext() {
		return context;
	}

	/**
	 * called when the bundle is started.
	 * 
	 * @param context
	 *            the bundle context.
	 * @throws Exception
	 *             not thrown.
	 * @see org.osgi.framework.BundleActivator#start(org.osgi.framework.BundleContext)
	 */
	public void start(final BundleContext context) throws Exception {
		instance = this;
		this.context = context;

		// get the log service, if present
		final ServiceReference logRef = context
				.getServiceReference("org.osgi.service.log.LogService"); //$NON-NLS-1$
		if (logRef != null) {
			RemoteOSGiServiceImpl.log = (LogService) context.getService(logRef);
		}

		if (remoting == null) {
			// get the instance of RemoteOSGiServiceImpl
			remoting = new RemoteOSGiServiceImpl();
		}

		// and register the service
		context.registerService(new String[] {
				RemoteOSGiService.class.getName(), Remoting.class.getName() }, remoting, null);

		// register the default tcp channel
		if (!"false" //$NON-NLS-1$
				.equals(context
						.getProperty(RemoteOSGiServiceImpl.REGISTER_DEFAULT_TCP_CHANNEL))) {
			final Dictionary properties = new Hashtable();
			properties.put(NetworkChannelFactory.PROTOCOL_PROPERTY,
					TCPChannelFactory.PROTOCOL);
			context.registerService(NetworkChannelFactory.class.getName(),
					new TCPChannelFactory(), properties);
			// TODO: add default transport supported intents
		}
	}

	/**
	 * called when the bundle is stopped.
	 * 
	 * @param context
	 *            the bundle context.
	 * @throws Exception
	 *             if something goes wrong.
	 * @see org.osgi.framework.BundleActivator#stop(org.osgi.framework.BundleContext)
	 */
	public void stop(final BundleContext context) throws Exception {
		// unregister and clean up
		remoting.cleanup();
		instance = null;
		this.context = null;
	}
}