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/*******************************************************************************
* Copyright (c) 2007 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.provider.discovery;
import java.util.HashSet;
import java.util.Properties;
import org.eclipse.ecf.core.ContainerConnectException;
import org.eclipse.ecf.core.util.Trace;
import org.eclipse.ecf.discovery.IDiscoveryAdvertiser;
import org.eclipse.ecf.discovery.IDiscoveryLocator;
import org.eclipse.ecf.discovery.service.IDiscoveryService;
import org.eclipse.ecf.provider.discovery.CompositeDiscoveryContainer;
import org.osgi.framework.*;
import org.osgi.util.tracker.ServiceTracker;
public class Activator implements BundleActivator {
// The shared instance
private static Activator plugin;
public static final String PLUGIN_ID = "org.eclipse.ecf.provider.discovery"; //$NON-NLS-1$
/**
* Returns the shared instance
*
* @return the shared instance
*/
public static Activator getDefault() {
return plugin;
}
/**
* The constructor
*/
public Activator() {
plugin = this;
}
/*
* (non-Javadoc)
* @see org.eclipse.core.runtime.Plugins#start(org.osgi.framework.BundleContext)
*/
public void start(final BundleContext context) throws Exception {
final Properties props = new Properties();
props.put(IDiscoveryLocator.CONTAINER_NAME, CompositeDiscoveryContainer.NAME);
props.put(Constants.SERVICE_RANKING, new Integer(1000));
String[] clazzes = new String[] {IDiscoveryService.class.getName(), IDiscoveryLocator.class.getName(), IDiscoveryAdvertiser.class.getName()};
context.registerService(clazzes, new ServiceFactory() {
/* (non-Javadoc)
* @see org.osgi.framework.ServiceFactory#getService(org.osgi.framework.Bundle, org.osgi.framework.ServiceRegistration)
*/
public Object getService(final Bundle bundle, final ServiceRegistration registration) {
// register the composite discovery service)
final CompositeDiscoveryContainer cdc;
cdc = new CompositeDiscoveryContainer(new HashSet());
try {
cdc.connect(null, null);
} catch (final ContainerConnectException e) {
Trace.catching(Activator.PLUGIN_ID, Activator.PLUGIN_ID + "/debug/methods/catching", this.getClass(), "getService(Bundle, ServiceRegistration)", e); //$NON-NLS-1$ //$NON-NLS-2$
return null;
}
Filter filter = null;
// add a service listener to add/remove IDS dynamically
try {
final String filter2 = "(&(" + Constants.OBJECTCLASS + "=" + IDiscoveryAdvertiser.class.getName() + ")(!(" + IDiscoveryLocator.CONTAINER_NAME + "=" + CompositeDiscoveryContainer.NAME + ")))"; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ //$NON-NLS-5$
filter = context.createFilter(filter2);
context.addServiceListener(new ServiceListener() {
/* (non-Javadoc)
* @see org.osgi.framework.ServiceListener#serviceChanged(org.osgi.framework.ServiceEvent)
*/
public void serviceChanged(final ServiceEvent arg0) {
final Object anIDS = context.getService(arg0.getServiceReference());
switch (arg0.getType()) {
case ServiceEvent.REGISTERED :
cdc.addContainer(anIDS);
break;
case ServiceEvent.UNREGISTERING :
cdc.removeContainer(anIDS);
break;
default :
break;
}
}
}, filter2);
} catch (final InvalidSyntaxException e) {
// nop
}
// get all previously registered IDS from OSGi (but not this one)
final ServiceTracker tracker = new ServiceTracker(context, filter, null);
tracker.open();
final Object[] services = tracker.getServices();
tracker.close();
if (services != null) {
for (int i = 0; i < services.length; i++) {
final Object obj = services[i];
if (obj != cdc)
cdc.addContainer(obj);
}
}
return cdc;
}
/* (non-Javadoc)
* @see org.osgi.framework.ServiceFactory#ungetService(org.osgi.framework.Bundle, org.osgi.framework.ServiceRegistration, java.lang.Object)
*/
public void ungetService(final Bundle bundle, final ServiceRegistration registration, final Object service) {
((CompositeDiscoveryContainer) service).dispose();
}
}, props);
}
/*
* (non-Javadoc)
* @see org.eclipse.core.runtime.Plugin#stop(org.osgi.framework.BundleContext)
*/
public void stop(final BundleContext context) throws Exception {
plugin = null;
}
}
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