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/*
* Copyright (c) OSGi Alliance (2010, 2012). 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.hooks.bundle;
import java.util.Collection;
import org.osgi.framework.BundleContext;
import org.osgi.framework.BundleEvent;
/**
* OSGi Framework Bundle Event Hook Service.
*
* <p>
* Bundles registering this service will be called during framework lifecycle
* (install, start, stop, update, and uninstall bundle) operations.
*
* @ThreadSafe
* @version $Id: e1471b36491a02bd8598a30d05c889ee58edc760 $
*/
public interface EventHook {
/**
* Bundle event hook method. This method is called prior to bundle event
* delivery when a bundle is installed, resolved, started, stopped,
* unresolved, or uninstalled. This method can filter the bundles which
* receive the event.
* <p>
* This method must be called by the framework one and only one time for
* each bundle event generated, this included bundle events which are
* generated when there are no bundle listeners registered. This method must
* be called on the same thread that is performing the action which
* generated the specified event. The specified collection includes bundle
* contexts with synchronous and asynchronous bundle listeners registered
* with them.
*
* @param event The bundle event to be delivered
* @param contexts A collection of Bundle Contexts for bundles which have
* listeners to which the specified event will be delivered. The
* implementation of this method may remove bundle contexts from the
* collection to prevent the event from being delivered to the
* associated bundles. The collection supports all the optional
* {@code Collection} operations except {@code add} and
* {@code addAll}. Attempting to add to the collection will result in
* an {@code UnsupportedOperationException}. The collection is not
* synchronized.
*/
void event(BundleEvent event, Collection<BundleContext> contexts);
}
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