content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 WARRANTIESOR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  package org.apache.aries.quiesce.participant;
  
  import java.util.List;
  
  import org.apache.aries.quiesce.manager.QuiesceCallback;
  import org.osgi.framework.Bundle;
  
  /**
   * Interface for OSGi containers / extenders to hook into the quiesce mechanism. An extender such
   * as Blueprint should implement a {@link QuiesceParticipant} and register it as a service in the service 
   * registry.
   */
  public interface QuiesceParticipant
  {
    /**
     * Request a number of bundles to be quiesced by this participant
     * 
     * This method must be non-blocking.
     * @param callback The callback with which to alert the manager of successful quiesce completion (from the view of this
     * participant)
     * @param bundlesToQuiesce The bundles scheduled to be quiesced
     */
    public void quiesce(QuiesceCallback callback, List<Bundle> bundlesToQuiesce);
  }
  