001/** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.activemq.broker; 018 019import java.util.Collections; 020import java.util.HashMap; 021import java.util.Iterator; 022import java.util.Map; 023import org.slf4j.Logger; 024import org.slf4j.LoggerFactory; 025 026/** 027 * 028 */ 029public class BrokerRegistry { 030 031 private static final Logger LOG = LoggerFactory.getLogger(BrokerRegistry.class); 032 private static final BrokerRegistry INSTANCE = new BrokerRegistry(); 033 034 private final Object mutex = new Object(); 035 private final Map<String, BrokerService> brokers = new HashMap<String, BrokerService>(); 036 037 public static BrokerRegistry getInstance() { 038 return INSTANCE; 039 } 040 041 /** 042 * @param brokerName 043 * @return the BrokerService 044 */ 045 public BrokerService lookup(String brokerName) { 046 BrokerService result = null; 047 synchronized (mutex) { 048 result = brokers.get(brokerName); 049 if (result == null && brokerName != null && brokerName.equals(BrokerService.DEFAULT_BROKER_NAME)) { 050 result = findFirst(); 051 if (result != null) { 052 LOG.warn("Broker localhost not started so using {} instead", result.getBrokerName()); 053 } 054 } 055 if (result == null && (brokerName==null || brokerName.isEmpty() || brokerName.equals("null"))){ 056 result = findFirst(); 057 } 058 } 059 return result; 060 } 061 062 /** 063 * Returns the first registered broker found 064 * 065 * @return the first BrokerService 066 */ 067 public BrokerService findFirst() { 068 synchronized (mutex) { 069 Iterator<BrokerService> iter = brokers.values().iterator(); 070 while (iter.hasNext()) { 071 return iter.next(); 072 } 073 return null; 074 } 075 } 076 077 /** 078 * @param brokerName 079 * @param broker 080 */ 081 public void bind(String brokerName, BrokerService broker) { 082 synchronized (mutex) { 083 brokers.put(brokerName, broker); 084 mutex.notifyAll(); 085 } 086 } 087 088 /** 089 * @param brokerName 090 */ 091 public void unbind(String brokerName) { 092 synchronized (mutex) { 093 brokers.remove(brokerName); 094 } 095 } 096 097 /** 098 * @return the mutex used 099 */ 100 public Object getRegistryMutext() { 101 return mutex; 102 } 103 104 public Map<String, BrokerService> getBrokers() { 105 return Collections.unmodifiableMap(this.brokers); 106 } 107}