ActiveMQ example source code file (BrokerRegistry.java)

This example ActiveMQ source code file (BrokerRegistry.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

broker, brokerregistry, brokerregistry, brokerservice, brokerservice, hashmap, instance, instance, iterator, log, logger, map, object, object, util

The ActiveMQ BrokerRegistry.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;

import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 
 */
public class BrokerRegistry {

    private static final Logger LOG = LoggerFactory.getLogger(BrokerRegistry.class);
    private static final BrokerRegistry INSTANCE = new BrokerRegistry();

    private final Object mutex = new Object();
    private final Map<String, BrokerService> brokers = new HashMap();

    public static BrokerRegistry getInstance() {
        return INSTANCE;
    }

    /**
     * @param brokerName
     * @return the BrokerService
     */
    public BrokerService lookup(String brokerName) {
        BrokerService result = null;
        synchronized (mutex) {
            result = brokers.get(brokerName);
            if (result == null && brokerName != null && brokerName.equals(BrokerService.DEFAULT_BROKER_NAME)) {
                result = findFirst();
                if (result != null) {
                    LOG.warn("Broker localhost not started so using " + result.getBrokerName() + " instead");
                }
            }
        }
        return result;
    }

    /**
     * Returns the first registered broker found
     * 
     * @return the first BrokerService
     */
    public BrokerService findFirst() {
        synchronized (mutex) {
            Iterator<BrokerService> iter = brokers.values().iterator();
            while (iter.hasNext()) {
                return iter.next();
            }
            return null;
        }
    }

    /**
     * @param brokerName
     * @param broker
     */
    public void bind(String brokerName, BrokerService broker) {
        synchronized (mutex) {
            brokers.put(brokerName, broker);
            mutex.notifyAll();
        }
    }

    /**
     * @param brokerName
     */
    public void unbind(String brokerName) {
        synchronized (mutex) {
            brokers.remove(brokerName);
        }
    }

    /**
     * @return the mutex used
     */
    public Object getRegistryMutext() {
        return mutex;
    }
    
    public Map<String, BrokerService> getBrokers() {
        return Collections.unmodifiableMap(this.brokers);
    }
}