CoreBundleActivator.java

/*******************************************************************************
 * Copyright (c) 2014 Wind River Systems, Inc. and others. 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:
 *     Wind River Systems - initial API and implementation
 *******************************************************************************/
package org.eclipse.tcf.te.tcf.log.core.activator;

import org.eclipse.core.runtime.Plugin;
import org.eclipse.tcf.te.runtime.preferences.ScopedEclipsePreferences;
import org.eclipse.tcf.te.runtime.tracing.TraceHandler;
import org.eclipse.tcf.te.tcf.log.core.manager.LogManager;
import org.osgi.framework.BundleContext;

/**
 * The activator class controls the plug-in life cycle
 */
public class CoreBundleActivator extends Plugin {
	// The shared instance
	private static CoreBundleActivator plugin;
	// The scoped preferences instance
	private static volatile ScopedEclipsePreferences scopedPreferences;
	// The trace handler instance
	private static volatile TraceHandler traceHandler;

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

	/**
	 * Convenience method which returns the unique identifier of this plugin.
	 */
	public static String getUniqueIdentifier() {
		if (getDefault() != null && getDefault().getBundle() != null) {
			return getDefault().getBundle().getSymbolicName();
		}
		return "org.eclipse.tcf.te.tcf.log.core"; //$NON-NLS-1$
	}

	/**
	 * Return the scoped preferences for this plugin.
	 */
	public static ScopedEclipsePreferences getScopedPreferences() {
		if (scopedPreferences == null) {
			scopedPreferences = new ScopedEclipsePreferences(getUniqueIdentifier());
		}
		return scopedPreferences;
	}

	/**
	 * Returns the bundles trace handler.
	 *
	 * @return The bundles trace handler.
	 */
	public static TraceHandler getTraceHandler() {
		if (traceHandler == null) {
			traceHandler = new TraceHandler(getUniqueIdentifier());
		}
		return traceHandler;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.core.runtime.Plugin#start(org.osgi.framework.BundleContext)
	 */
	@Override
	public void start(BundleContext context) throws Exception {
		super.start(context);
		plugin = this;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.core.runtime.Plugin#stop(org.osgi.framework.BundleContext)
	 */
	@Override
	public void stop(BundleContext context) throws Exception {
		plugin = null;
		scopedPreferences = null;
		traceHandler = null;
		LogManager.getInstance().dispose();
		super.stop(context);
	}
}