framework/bundles/org.eclipse.ecf.remoteservice.ui/src/org/eclipse/ecf/internal/remoteservices/ui/Activator.java

/*******************************************************************************
 * Copyright (c) 2008 Versant Corp.
 * 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:
 *     Markus Kuppe (mkuppe <at> versant <dot> com) - initial API and implementation
 ******************************************************************************/

package org.eclipse.ecf.internal.remoteservices.ui;

import org.eclipse.ecf.core.IContainerManager;
import org.eclipse.ui.plugin.AbstractUIPlugin;
import org.osgi.framework.BundleContext;
import org.osgi.util.tracker.ServiceTracker;

public class Activator extends AbstractUIPlugin {

	private volatile ServiceTracker containerManagerTracker;
	// The shared instance
	private volatile static Activator plugin;

	/**
	 * The constructor
	 */
	public Activator() {
		plugin = this;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.ui.plugin.AbstractUIPlugin#stop(org.osgi.framework.BundleContext
	 * )
	 */
	public void stop(BundleContext context) throws Exception {
		plugin = null;
		if (containerManagerTracker != null) {
			containerManagerTracker.close();
			containerManagerTracker = null;
		}
		super.stop(context);
	}

	/**
	 * Returns the shared instance
	 * 
	 * @return the shared instance
	 */
	public static Activator getDefault() {
		return plugin;
	}

	public IContainerManager getContainerManager() {
		BundleContext context = getBundle().getBundleContext();
		if (containerManagerTracker == null) {
			containerManagerTracker = new ServiceTracker(context,
					IContainerManager.class.getName(), null);
			containerManagerTracker.open();
		}
		return (IContainerManager) containerManagerTracker.getService();
	}
}