/**
* 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<? super Subscription> orderedCompare = new Comparator<Subscription>() {
@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<Subscription> consumers)
throws Exception {
ArrayList<Subscription> ordered = new ArrayList<Subscription>(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);
}
}