/*******************************************************************************
* Copyright (c) 2013 Markus Alexander Kuppe 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:
* Markus Alexander Kuppe - initial API and implementation
******************************************************************************/
package org.eclipse.ecf.internal.discovery;
import org.eclipse.ecf.core.identity.Namespace;
import org.eclipse.ecf.discovery.*;
import org.eclipse.ecf.discovery.identity.*;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
import org.osgi.util.tracker.ServiceTracker;
import org.osgi.util.tracker.ServiceTrackerCustomizer;
/**
* An IServiceInfoServiceListener is a whiteboard pattern listener responsible
* to handle IServiceInfos registered in the OSGi service registry.
*/
public class IServiceInfoServiceListener {
private final ServiceTracker serviceTracker;
public IServiceInfoServiceListener(final IDiscoveryAdvertiser advertiser) {
final BundleContext bundleContext = DiscoveryPlugin.getDefault()
.getBundleContext();
serviceTracker = new ServiceTracker(bundleContext, IServiceInfo.class,
new ServiceTrackerCustomizer() {
public Object addingService(ServiceReference reference) {
final IServiceInfo serviceInfo = (IServiceInfo) bundleContext
.getService(reference);
final IServiceInfo specific = convertToProviderSpecific(
advertiser, serviceInfo);
advertiser.registerService(specific);
return serviceInfo;
}
public void modifiedService(ServiceReference reference,
Object service) {
// TODO discovery containers might require to
// unregisterService first
advertiser.registerService(convertToProviderSpecific(
advertiser, (IServiceInfo) service));
}
public void removedService(ServiceReference reference,
Object service) {
advertiser.unregisterService(convertToProviderSpecific(
advertiser, (IServiceInfo) service));
}
});
serviceTracker.open();
}
/**
* Converts the generic (not discovery provider specific WRT
* IServiceID/IServiceTypeID) IServiceInfo into a discovery provider
* specific one. This is required so that discovery providers can correctly
* advertise services.
*/
private IServiceInfo convertToProviderSpecific(
final IDiscoveryAdvertiser advertiser,
final IServiceInfo genericInfo) {
// Convert similar to
// org.eclipse.ecf.provider.discovery.CompositeDiscoveryContainer.getServiceIDForDiscoveryContainer(IServiceID,
// IDiscoveryLocator)
final Namespace servicesNamespace = advertiser.getServicesNamespace();
final IServiceID genericServiceID = genericInfo.getServiceID();
final ServiceID specificServiceID = (ServiceID) servicesNamespace
.createInstance(new Object[] {
genericServiceID.getServiceTypeID().getName(),
genericServiceID.getLocation() });
final IServiceTypeID serviceTypeID = specificServiceID
.getServiceTypeID();
return new ServiceInfo(genericServiceID.getLocation(),
genericInfo.getServiceName(), serviceTypeID,
genericInfo.getPriority(), genericInfo.getWeight(),
genericInfo.getServiceProperties());
}
public void dispose() {
serviceTracker.close();
}
}