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AspectJ tools most notably contains the AspectJ compiler (AJC). AJC applies aspects to Java classes during compilation, fully replacing Javac for plain Java classes and also compiling native AspectJ or annotation-based @AspectJ syntax. Furthermore, AJC can weave aspects into existing class files in a post-compile binary weaving step. This library is a superset of AspectJ weaver and hence also of AspectJ runtime.

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/*
 * Copyright (c) OSGi Alliance (2000, 2015). 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;
import org.osgi.annotation.versioning.ConsumerType;

/**
 * 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}.
 * 
 * 
 * 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.
 * 
 * 

 * {@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.
 * 
 * 
 * {@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
 * @author $Id: e061a4c69c017c04dafe285926424bd1a2132b51 $
 */
@ConsumerType
@FunctionalInterface
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);
}