/*******************************************************************************
* Copyright (c) 2008 Jan S. Rellermeyer, 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:
* Jan S. Rellermeyer - initial API and implementation
******************************************************************************/
package org.eclipse.ecf.internal.provider.r_osgi;
import ch.ethz.iks.r_osgi.RemoteOSGiService;
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.ExtensionRegistryRunnable;
import org.eclipse.ecf.provider.r_osgi.identity.R_OSGiNamespace;
import org.eclipse.ecf.provider.r_osgi.identity.R_OSGiRemoteServiceNamespace;
import org.eclipse.equinox.concurrent.future.IExecutor;
import org.osgi.framework.*;
import org.osgi.util.tracker.ServiceTracker;
/**
* The activator class controls the plug-in life cycle.
*
* @author Jan S. Rellermeyer, ETH Zurich
*/
public final class Activator implements BundleActivator {
// This is a service property that is used to find any IExecutor service instances
// to be used for synchronous or asynchronous execution. The use of the IExecutor
// The type of the value for this property is String, and valid values are 'sync' or 'async'
// For example, to setup one's own executor implementation to use for async invocation
// on a consumer would look like this
//
// props.put("org.eclipse.ecf.provider.r_osgi.consumerExecutor","async");
// bundleContext.registerService(IExecutor.class.getName(), new MyExecutor(), props);
//
public static final String CONSUMER_SYNC_EXECUTOR_TYPE = "org.eclipse.ecf.provider.r_osgi.consumerExecutor"; //$NON-NLS-1$
// The plug-in ID
public static final String PLUGIN_ID = "org.eclipse.ecf.provider.r_osgi"; //$NON-NLS-1$
// The shared instance
static Activator plugin;
// The bundle context
private BundleContext context;
// The service tracker for the R-OSGi remote service
private ServiceTracker r_osgi_tracker;
/**
* The constructor.
*/
public Activator() {
plugin = this;
}
/**
* Called when the OSGi framework starts the bundle.
*
* @param bc
* the bundle context.
* @see org.osgi.framework.BundleActivator#start(org.osgi.framework.BundleContext)
*/
public void start(final BundleContext bc) throws Exception {
this.context = bc;
r_osgi_tracker = new ServiceTracker(context, RemoteOSGiService.class.getName(), null);
r_osgi_tracker.open();
SafeRunner.run(new ExtensionRegistryRunnable(bc) {
protected void runWithoutRegistry() throws Exception {
bc.registerService(Namespace.class, new R_OSGiNamespace(), null);
bc.registerService(Namespace.class, new R_OSGiRemoteServiceNamespace(), null);
bc.registerService(ContainerTypeDescription.class, new ContainerTypeDescription(R_OSGiContainerInstantiator.NAME, new R_OSGiContainerInstantiator(), "R_OSGi Container", true, false), null); //$NON-NLS-1$
}
});
}
/**
* Called when the OSGi framework stops the bundle.
*
* @param bc
* the bundle context.
* @see org.osgi.framework.BundleActivator#stop(org.osgi.framework.BundleContext)
*/
public void stop(final BundleContext bc) throws Exception {
r_osgi_tracker.close();
r_osgi_tracker = null;
synchronized (executorServiceTrackerLock) {
if (executorServiceTracker != null) {
executorServiceTracker.close();
executorServiceTracker = null;
}
}
this.context = null;
plugin = null;
}
/**
* get the bundle context.
*
* @return the bundle context.
*/
public BundleContext getContext() {
return context;
}
/**
* get the R-OSGi service instance.
*
* @return the R-OSGi service instance or null, if there is none.
*/
public RemoteOSGiService getRemoteOSGiService() {
if (r_osgi_tracker == null) {
return null;
}
return (RemoteOSGiService) r_osgi_tracker.getService();
}
/**
* Returns the shared instance.
*
* @return the shared instance
*/
public static synchronized Activator getDefault() {
if (plugin == null) {
plugin = new Activator();
}
return plugin;
}
private ServiceTracker executorServiceTracker;
private final Object executorServiceTrackerLock = new Object();
private Filter createExecutorFilter(boolean sync) {
try {
return getContext().createFilter("(&(" + Constants.OBJECTCLASS + "=" + IExecutor.class.getName() + ")(" + CONSUMER_SYNC_EXECUTOR_TYPE + "=" + ((sync) ? "sync" : "async") + "))"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ //$NON-NLS-5$ //$NON-NLS-6$ //$NON-NLS-7$
} catch (InvalidSyntaxException e) {
// should not happen
return null;
}
}
public IExecutor getExecutor(boolean sync) {
synchronized (executorServiceTrackerLock) {
if (executorServiceTracker == null) {
Filter syncExecutorFilter = createExecutorFilter(sync);
executorServiceTracker = new ServiceTracker(getContext(), syncExecutorFilter, null);
executorServiceTracker.open();
}
}
return (IExecutor) executorServiceTracker.getService();
}
}