/*******************************************************************************
* Copyright (c) 2008 Cambridge Semantics Incorporated.
* 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
*
* File: $Source$
* Created by: Matthew Roy ( <a href="mailto:mroy@cambridgesemantics.com">mroy@cambridgesemantics.com </a>)
* Created on: Jun 2, 2008
* Revision: $Id$
*
* Contributors:
* Cambridge Semantics Incorporated - initial API and implementation
*******************************************************************************/
package org.openanzo.osgi;
import org.osgi.framework.BundleContext;
import org.osgi.framework.Filter;
import org.osgi.framework.ServiceReference;
import org.osgi.util.tracker.ServiceTracker;
/**
* Tracker that keeps track of a service type being registered and unregistered
*
* @param <S>
* type of service to track
* @author Matthew Roy ( <a href="mailto:mroy@cambridgesemantics.com">mroy@cambridgesemantics.com</a>)
*
*/
public class OsgiServiceTracker<S> extends ServiceTracker {
private final IServiceTrackerListener<S> listener;
/**
* Create a tracker with the given listener
*
* @param listener
* listener for events
* @param context
* context for the tracker
*/
public OsgiServiceTracker(IServiceTrackerListener<S> listener, BundleContext context) {
super(context, listener.getComponentType().getName(), null);
this.listener = listener;
}
/**
* Create a tracker for the given listener with a filter
*
* @param listener
* listener for events
* @param filter
* filter for tracker
* @param context
* context for the tracker
*/
public OsgiServiceTracker(IServiceTrackerListener<S> listener, Filter filter, BundleContext context) {
super(context, filter, null);
this.listener = listener;
}
@SuppressWarnings("unchecked")
@Override
public Object addingService(ServiceReference reference) {
S service = (S) context.getService(reference);
listener.registerService(service);
return service;
}
@SuppressWarnings("unchecked")
@Override
public void removedService(ServiceReference reference, Object serviceObject) {
S service = (S) serviceObject;
listener.unregisterService(service);
context.ungetService(reference);
}
}