org.apache.activemq.broker.view.MessageBrokerViewRegistry Maven / Gradle / Ivy
/**
* 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.view;
import java.util.HashMap;
import java.util.Map;
import org.apache.activemq.broker.BrokerRegistry;
import org.apache.activemq.broker.BrokerService;
public class MessageBrokerViewRegistry {
private static final MessageBrokerViewRegistry INSTANCE = new MessageBrokerViewRegistry();
private final Object mutex = new Object();
private final Map brokerViews = new HashMap();
public static MessageBrokerViewRegistry getInstance() {
return INSTANCE;
}
/**
* @param brokerName
* @return the BrokerService
*/
public MessageBrokerView lookup(String brokerName) {
MessageBrokerView result = null;
synchronized (mutex) {
result = brokerViews.get(brokerName);
if (result==null){
BrokerService brokerService = BrokerRegistry.getInstance().lookup(brokerName);
if (brokerService != null){
result = new MessageBrokerView(brokerService);
brokerViews.put(brokerName,result);
}
}
}
return result;
}
}