org.apache.activemq.broker.region.policy.PriorityDispatchPolicy Maven / Gradle / Ivy

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/**
 * 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.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import org.apache.activemq.broker.region.MessageReference;
import org.apache.activemq.broker.region.Subscription;
import org.apache.activemq.filter.MessageEvaluationContext;

/**
 * Priority dispatch policy that sends a message to every subscription that
 * matches the message in consumer priority order.
 * 
 * @org.apache.xbean.XBean
 * 
 */
public class PriorityDispatchPolicy extends SimpleDispatchPolicy {

    private final Comparator orderedCompare = new Comparator() {
        @Override
        public int compare(Subscription o1, Subscription o2) {
            // We want the list sorted in descending order
            return o2.getConsumerInfo().getPriority() - o1.getConsumerInfo().getPriority();
        }
    };

    public boolean dispatch(MessageReference node, MessageEvaluationContext msgContext, List consumers)
            throws Exception {
        ArrayList ordered = new ArrayList(consumers);
        Collections.sort(ordered, orderedCompare);

        StringBuffer stringBuffer = new StringBuffer();
        for (Subscription sub: ordered) {
            stringBuffer.append(sub.getConsumerInfo().getPriority());
            stringBuffer.append(',');
        }
        //System.err.println("Priority:" + stringBuffer.toString() + ", msg: " + node.getMessage());
        return super.dispatch(node, msgContext, ordered);
    }

}