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/*
* Copyright (c) OSGi Alliance (2000, 2010). All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.osgi.framework;
import java.util.EventListener;
/**
* A {@code ServiceEvent} listener. {@code ServiceListener} is a
* listener interface that may be implemented by a bundle developer. When a
* {@code ServiceEvent} is fired, it is synchronously delivered to a
* {@code ServiceListener}. The Framework may deliver
* {@code ServiceEvent} objects to a {@code ServiceListener} out
* of order and may concurrently call and/or reenter a
* {@code ServiceListener}.
*
* <p>
* A {@code ServiceListener} object is registered with the Framework
* using the {@code BundleContext.addServiceListener} method.
* {@code ServiceListener} objects are called with a
* {@code ServiceEvent} object when a service is registered, modified, or
* is in the process of unregistering.
*
* <p>
* {@code ServiceEvent} object delivery to {@code ServiceListener}
* objects is filtered by the filter specified when the listener was registered.
* If the Java Runtime Environment supports permissions, then additional
* filtering is done. {@code ServiceEvent} objects are only delivered to
* the listener if the bundle which defines the listener object's class has the
* appropriate {@code ServicePermission} to get the service using at
* least one of the named classes under which the service was registered.
*
* <p>
* {@code ServiceEvent} object delivery to {@code ServiceListener}
* objects is further filtered according to package sources as defined in
* {@link ServiceReference#isAssignableTo(Bundle, String)}.
*
* @see ServiceEvent
* @see ServicePermission
* @ThreadSafe
* @version $Id: d73f8e9b4babc8b53b5d1cbe7b17b732f54bb2a3 $
*/
public interface ServiceListener extends EventListener {
/**
* Receives notification that a service has had a lifecycle change.
*
* @param event The {@code ServiceEvent} object.
*/
public void serviceChanged(ServiceEvent event);
}
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