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ActiveMQ example source code file (RoundRobinDispatchPolicy.java)
The ActiveMQ RoundRobinDispatchPolicy.java source code/** * 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.Iterator; import java.util.List; import org.apache.activemq.broker.region.MessageReference; import org.apache.activemq.broker.region.Subscription; import org.apache.activemq.filter.MessageEvaluationContext; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * Simple dispatch policy that sends a message to every subscription that * matches the message. * * @org.apache.xbean.XBean * */ public class RoundRobinDispatchPolicy implements DispatchPolicy { static final Logger LOG = LoggerFactory.getLogger(RoundRobinDispatchPolicy.class); /** * @param node * @param msgContext * @param consumers * @return true if dispatched * @throws Exception * @see org.apache.activemq.broker.region.policy.DispatchPolicy#dispatch(org.apache.activemq.broker.region.MessageReference, * org.apache.activemq.filter.MessageEvaluationContext, java.util.List) */ public boolean dispatch(MessageReference node, MessageEvaluationContext msgContext, List<Subscription> consumers) throws Exception { int count = 0; Subscription firstMatchingConsumer = null; synchronized (consumers) { for (Iterator<Subscription> iter = consumers.iterator(); iter .hasNext();) { Subscription sub = iter.next(); // Only dispatch to interested subscriptions if (!sub.matches(node, msgContext)) { sub.unmatched(node); continue; } if (firstMatchingConsumer == null) { firstMatchingConsumer = sub; } sub.add(node); count++; } if (firstMatchingConsumer != null) { // Rotate the consumer list. try { consumers.remove(firstMatchingConsumer); consumers.add(firstMatchingConsumer); } catch (Throwable bestEffort) { } } } return count > 0; } } Other ActiveMQ examples (source code examples)Here is a short list of links related to this ActiveMQ RoundRobinDispatchPolicy.java source code file: |
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