001/** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.activemq.broker.region.policy; 018 019import java.util.ArrayList; 020import java.util.Collections; 021import java.util.Comparator; 022import java.util.List; 023import org.apache.activemq.broker.region.MessageReference; 024import org.apache.activemq.broker.region.Subscription; 025import org.apache.activemq.filter.MessageEvaluationContext; 026 027/** 028 * Priority dispatch policy that sends a message to every subscription that 029 * matches the message in consumer priority order. 030 * 031 * @org.apache.xbean.XBean 032 * 033 */ 034public class PriorityDispatchPolicy extends SimpleDispatchPolicy { 035 036 private final Comparator<? super Subscription> orderedCompare = new Comparator<Subscription>() { 037 @Override 038 public int compare(Subscription o1, Subscription o2) { 039 // We want the list sorted in descending order 040 return o2.getConsumerInfo().getPriority() - o1.getConsumerInfo().getPriority(); 041 } 042 }; 043 044 public boolean dispatch(MessageReference node, MessageEvaluationContext msgContext, List<Subscription> consumers) 045 throws Exception { 046 ArrayList<Subscription> ordered = new ArrayList<Subscription>(consumers); 047 Collections.sort(ordered, orderedCompare); 048 049 StringBuffer stringBuffer = new StringBuffer(); 050 for (Subscription sub: ordered) { 051 stringBuffer.append(sub.getConsumerInfo().getPriority()); 052 stringBuffer.append(','); 053 } 054 //System.err.println("Priority:" + stringBuffer.toString() + ", msg: " + node.getMessage()); 055 return super.dispatch(node, msgContext, ordered); 056 } 057 058}