framework/src/main/java/org/osgi/framework/AllServiceListener.java

/*
 * Copyright (c) OSGi Alliance (2005, 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 org.osgi.annotation.versioning.ConsumerType;

/**
 * A {@code ServiceEvent} listener that does not filter based upon package
 * wiring. {@code AllServiceListener} is a listener interface that may be
 * implemented by a bundle developer. When a {@code ServiceEvent} is fired, it
 * is synchronously delivered to an {@code AllServiceListener}. The Framework
 * may deliver {@code ServiceEvent} objects to an {@code AllServiceListener} out
 * of order and may concurrently call and/or reenter an
 * {@code AllServiceListener}.
 * <p>
 * An {@code AllServiceListener} object is registered with the Framework using
 * the {@code BundleContext.addServiceListener} method.
 * {@code AllServiceListener} 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 AllServiceListener} 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>
 * Unlike normal {@code ServiceListener} objects, {@code AllServiceListener}
 * objects receive all {@code ServiceEvent} objects regardless of whether the
 * package source of the listening bundle is equal to the package source of the
 * bundle that registered the service. This means that the listener may not be
 * able to cast the service object to any of its corresponding service
 * interfaces if the service object is retrieved.
 * 
 * @see ServiceEvent
 * @see ServicePermission
 * @ThreadSafe
 * @since 1.3
 * @author $Id: 7eba8b2b69fd8e68b793fd09611b6efdc6fdd73c $
 */
@ConsumerType
@FunctionalInterface
public interface AllServiceListener extends ServiceListener {
	// This is a marker interface
}