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  * Copyright (c) OSGi Alliance (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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.osgi.framework.hooks.bundle;
OSGi Framework Bundle Event Hook Service.

Bundles registering this service will be called during framework lifecycle (install, start, stop, update, and uninstall bundle) operations.

$Id: 18ea1ec1f14f47410a43e99be4da3b2583149722 $
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.

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.

event The bundle event to be delivered
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 Collection operations except add and addAll. Attempting to add to the collection will result in an UnsupportedOperationException. The collection is not synchronized.
	void event(BundleEvent eventCollection<BundleContextcontexts);
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