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ActiveMQ example source code file (ConnectionSplitBroker.java)

This example ActiveMQ source code file (ConnectionSplitBroker.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - ActiveMQ tags/keywords

activemqdestination, arraylist, arraylist, brokerfilter, connectionsplitbroker, connectionsplitbroker, consumerid, consumerinfo, consumerinfo, exception, exception, list, logger, subscription, util

The ActiveMQ ConnectionSplitBroker.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.cluster;

import java.util.ArrayList;
import java.util.List;

import org.apache.activemq.broker.Broker;
import org.apache.activemq.broker.BrokerFilter;
import org.apache.activemq.broker.ConnectionContext;
import org.apache.activemq.broker.region.Subscription;
import org.apache.activemq.command.ActiveMQDestination;
import org.apache.activemq.command.ConsumerId;
import org.apache.activemq.command.ConsumerInfo;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Monitors for client connections that may fail to another broker - but this
 * broker isn't aware they've gone. Can occur with network glitches or client
 * error
 * 
 * 
 */
public class ConnectionSplitBroker extends BrokerFilter{
    private static final Logger LOG = LoggerFactory.getLogger(ConnectionSplitBroker.class);
    private List<ConsumerInfo>networkConsumerList = new ArrayList();
    public ConnectionSplitBroker(Broker next) {
        super(next);
    }

        
    public Subscription addConsumer(ConnectionContext context, ConsumerInfo info)
            throws Exception {
        ActiveMQDestination dest = info.getDestination();

        synchronized (networkConsumerList) {
            if (info.isNetworkSubscription()) {
                networkConsumerList.add(info);
            } else {
                if (!networkConsumerList.isEmpty()) {
                    List<ConsumerInfo> gcList = new ArrayList();
                    for (ConsumerInfo nc : networkConsumerList) {
                        if (!nc.isNetworkConsumersEmpty()) {
                            
                            for (ConsumerId id : nc.getNetworkConsumerIds()) {
                                
                                if (id.equals(info.getConsumerId())) {
                                    nc.removeNetworkConsumerId(id);
                                    if (nc.isNetworkConsumersEmpty()) {
                                        gcList.add(nc);
                                    }
                                }
                            }
                        }
                    }
                    for (ConsumerInfo nc : gcList) {
                        networkConsumerList.remove(nc);
                        super.removeConsumer(context, nc);
                        LOG.warn("Removed stale network consumer " + nc);
                    }
                }
            }
        }

        return super.addConsumer(context, info);
    }

    public void removeConsumer(ConnectionContext context, ConsumerInfo info) throws Exception {
        if (info.isNetworkSubscription()) {

            synchronized (networkConsumerList) {
                networkConsumerList.remove(info);
            }
        }
        super.removeConsumer(context, info);
    }
}

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