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 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.apache.activemq.broker.region.policy;
  
  import java.util.List;
  
  import org.apache.activemq.broker.region.MessageReference;
  import org.apache.activemq.broker.region.Subscription;
  import org.apache.activemq.filter.MessageEvaluationContext;
  
  /**
   * Abstraction to allow different dispatching policies to be plugged
   * into the  topic region implementations.  This is used by a topic to deliver
   * messages to the matching subscriptions.
   * 
   * 
   */
  public interface DispatchPolicy {
      
      /**
       * Decides how to dispatch a selected message to a collection of consumers.  A safe
       * approach is to dispatch to every subscription that matches.
       *
       * The list will be safe to iterate over when this method is called
       * 
       * @return true if at least one consumer was dispatched or false if there are no active subscriptions that could be dispatched
       */
      boolean dispatch(MessageReference node, MessageEvaluationContext msgContext, List<Subscription> consumers) throws Exception;
  
  }
  