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ActiveMQ example source code file (ConduitBridge.java)

This example ActiveMQ source code file (ConduitBridge.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

arraylist, conduitbridge, conduitbridge, demandforwardingbridge, demandsubscription, demandsubscription, io, ioexception, iterator, iterator, list, logger, override, transport, transport, util

The ActiveMQ ConduitBridge.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.network;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import org.apache.activemq.command.BrokerId;
import org.apache.activemq.command.ConsumerId;
import org.apache.activemq.command.ConsumerInfo;
import org.apache.activemq.filter.DestinationFilter;
import org.apache.activemq.transport.Transport;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Consolidates subscriptions
 * 
 * 
 */
public class ConduitBridge extends DemandForwardingBridge {
    private static final Logger LOG = LoggerFactory.getLogger(ConduitBridge.class);

    /**
     * Constructor
     * 
     * @param localBroker
     * @param remoteBroker
     */
    public ConduitBridge(NetworkBridgeConfiguration configuration, Transport localBroker, Transport remoteBroker) {
        super(configuration, localBroker, remoteBroker);
    }

    @Override
    protected DemandSubscription createDemandSubscription(ConsumerInfo info) throws IOException {
        if (addToAlreadyInterestedConsumers(info)) {
            return null; // don't want this subscription added
        }
        //add our original id to ourselves
        info.addNetworkConsumerId(info.getConsumerId());
        info.setSelector(null);
        return doCreateDemandSubscription(info);
    }
    
    protected boolean checkPaths(BrokerId[] first, BrokerId[] second) {
    	if (first == null || second == null)
			return true;
		if (Arrays.equals(first, second))
			return true;
		if (first[0].equals(second[0])
				&& first[first.length - 1].equals(second[second.length - 1]))
			return false;
		else
			return true;
    }

    protected boolean addToAlreadyInterestedConsumers(ConsumerInfo info) {
        // search through existing subscriptions and see if we have a match
        boolean matched = false;
        for (Iterator i = subscriptionMapByLocalId.values().iterator(); i.hasNext();) {
            DemandSubscription ds = (DemandSubscription)i.next();
            DestinationFilter filter = DestinationFilter.parseFilter(ds.getLocalInfo().getDestination());
            if (filter.matches(info.getDestination())) {
                if (LOG.isDebugEnabled()) {
                    LOG.debug(configuration.getBrokerName() + " matched (add interest) to exsting sub for: " + ds.getRemoteInfo()
                            + " with sub: " + info.getConsumerId());
                }
                // add the interest in the subscription
                // ds.add(ds.getRemoteInfo().getConsumerId());
                if (checkPaths(info.getBrokerPath(), ds.getRemoteInfo().getBrokerPath())) {
                	ds.add(info.getConsumerId());
                }
                matched = true;
                // continue - we want interest to any existing
                // DemandSubscriptions
            }
        }
        return matched;
    }

    @Override
    protected void removeDemandSubscription(ConsumerId id) throws IOException {
        List<DemandSubscription> tmpList = new ArrayList();

        for (Iterator i = subscriptionMapByLocalId.values().iterator(); i.hasNext();) {
            DemandSubscription ds = (DemandSubscription)i.next();
            if (ds.remove(id)) {
                if (LOG.isDebugEnabled()) {
                    LOG.debug(configuration.getBrokerName() + " removing interest in sub on " + localBroker + " from " + remoteBrokerName + " : sub: " + id  + " existing matched sub: " + ds.getRemoteInfo());
                }
            }
            if (ds.isEmpty()) {
                tmpList.add(ds);
            }
        }
        for (Iterator<DemandSubscription> i = tmpList.iterator(); i.hasNext();) {
            DemandSubscription ds = i.next();
            removeSubscription(ds);
            if (LOG.isDebugEnabled()) {
                LOG.debug(configuration.getBrokerName() + " removing sub on " + localBroker + " from " + remoteBrokerName + " :  " + ds.getRemoteInfo());
            }
        }

    }

}

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