/******************************************************************************* 
 * Copyright (c) 2010-2011 Naumen. All rights reserved. This
 * program and the accompanying materials are made available under the terms of
 * the Eclipse Public License v1.0 which accompanies this distribution, and is
 * available at http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *   Pavel Samolisov - initial API and implementation
 *******************************************************************************/
package org.eclipse.ecf.internal.remoteservice.rpc;

import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.SafeRunner;
import org.eclipse.ecf.core.ContainerTypeDescription;
import org.eclipse.ecf.core.identity.Namespace;
import org.eclipse.ecf.core.util.*;
import org.eclipse.ecf.remoteservice.rpc.identity.RpcNamespace;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.service.log.LogService;
import org.osgi.util.tracker.ServiceTracker;

public class Activator implements BundleActivator {

	// The plug-in ID
	public static final String PLUGIN_ID = "org.eclipse.ecf.remoteservice.rpc"; //$NON-NLS-1$

	// The shared instance
	private static Activator plugin;

	private static BundleContext context;

	private ServiceTracker logServiceTracker = null;

	private LogService logService = null;

	static BundleContext getContext() {
		return context;
	}

	/*
	 * (non-Javadoc)
	 * @see org.osgi.framework.BundleActivator#start(org.osgi.framework.BundleContext)
	 */
	public void start(final BundleContext bundleContext) throws Exception {
		plugin = this;
		Activator.context = bundleContext;
		SafeRunner.run(new ExtensionRegistryRunnable(bundleContext) {
			protected void runWithoutRegistry() throws Exception {
				bundleContext.registerService(Namespace.class, new RpcNamespace(), null);
				bundleContext.registerService(ContainerTypeDescription.class, new ContainerTypeDescription(
						"ecf.xmlrpc.client", new RpcClientContainerInstantiator(), "Rpc Client Container"), null); //$NON-NLS-1$ //$NON-NLS-2$
			}
		});
	}

	/*
	 * (non-Javadoc)
	 * @see org.osgi.framework.BundleActivator#stop(org.osgi.framework.BundleContext)
	 */
	public void stop(BundleContext bundleContext) throws Exception {
		if (logServiceTracker != null) {
			logServiceTracker.close();
			logServiceTracker = null;
			logService = null;
		}
		plugin = null;
		Activator.context = null;
	}

	/**
	 * Returns the shared instance
	 * 
	 * @return the shared instance
	 */
	public static synchronized Activator getDefault() {
		if (plugin == null) {
			plugin = new Activator();
		}
		return plugin;
	}

	protected LogService getLogService() {
		if (logServiceTracker == null) {
			logServiceTracker = new ServiceTracker(Activator.context, LogService.class.getName(), null);
			logServiceTracker.open();
		}
		logService = (LogService) logServiceTracker.getService();
		if (logService == null)
			logService = new SystemLogService(PLUGIN_ID);
		return logService;
	}

	public void log(IStatus status) {
		if (logService == null)
			logService = getLogService();
		if (logService != null)
			logService.log(LogHelper.getLogCode(status), LogHelper.getLogMessage(status), status.getException());
	}
}