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ActiveMQ example source code file (SelectorAwareVirtualTopicInterceptor.java)
The ActiveMQ SelectorAwareVirtualTopicInterceptor.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.virtual; import java.io.IOException; import java.util.List; import java.util.Set; import org.apache.activemq.broker.Broker; import org.apache.activemq.broker.ProducerBrokerExchange; import org.apache.activemq.broker.region.Destination; import org.apache.activemq.broker.region.Subscription; import org.apache.activemq.command.ActiveMQDestination; import org.apache.activemq.command.Message; import org.apache.activemq.filter.MessageEvaluationContext; import org.apache.activemq.filter.NonCachedMessageEvaluationContext; public class SelectorAwareVirtualTopicInterceptor extends VirtualTopicInterceptor { public SelectorAwareVirtualTopicInterceptor(Destination next, String prefix, String postfix) { super(next, prefix, postfix); } /** * Respect the selectors of the subscriptions to ensure only matched messages are dispatched to * the virtual queues, hence there is no build up of unmatched messages on these destinations */ @Override protected void send(ProducerBrokerExchange context, Message message, ActiveMQDestination destination) throws Exception { Broker broker = context.getConnectionContext().getBroker(); Set<Destination> destinations = broker.getDestinations(destination); for (Destination dest : destinations) { if (matchesSomeConsumer(message, dest)) { dest.send(context, message.copy()); } } } private boolean matchesSomeConsumer(Message message, Destination dest) throws IOException { boolean matches = false; MessageEvaluationContext msgContext = new NonCachedMessageEvaluationContext(); msgContext.setDestination(dest.getActiveMQDestination()); msgContext.setMessageReference(message); List<Subscription> subs = dest.getConsumers(); for (Subscription sub: subs) { if (sub.matches(message, msgContext)) { matches = true; break; } } return matches; } } Other ActiveMQ examples (source code examples)Here is a short list of links related to this ActiveMQ SelectorAwareVirtualTopicInterceptor.java source code file: |
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