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.transport.discovery.masterslave;
018
019import java.net.URI;
020import org.apache.activemq.transport.discovery.simple.SimpleDiscoveryAgent;
021import org.slf4j.Logger;
022import org.slf4j.LoggerFactory;
023
024/**
025 * A static DiscoveryAgent that supports connecting to a Master / Slave tuple
026 * of brokers.
027 */
028public class MasterSlaveDiscoveryAgent extends SimpleDiscoveryAgent {
029
030    private final static Logger LOG = LoggerFactory.getLogger(MasterSlaveDiscoveryAgent.class);
031
032    private String[] msServices = new String[]{};
033
034    @Override
035    public String[] getServices() {
036        return msServices;
037    }
038
039    @Override
040    public void setServices(String services) {
041        this.msServices = services.split(",");
042        configureServices();
043    }
044
045    @Override
046    public void setServices(String services[]) {
047        this.msServices = services;
048        configureServices();
049    }
050
051    @Override
052    public void setServices(URI services[]) {
053        this.msServices = new String[services.length];
054        for (int i = 0; i < services.length; i++) {
055            this.msServices[i] = services[i].toString();
056        }
057        configureServices();
058    }
059
060    protected void configureServices() {
061        if ((msServices == null) || (msServices.length < 2)) {
062            LOG.error("masterSlave requires at least 2 URIs");
063            msServices = new String[]{};
064            throw new IllegalArgumentException("Expecting at least 2 arguments");
065        }
066
067        StringBuffer buf = new StringBuffer();
068
069        buf.append("failover:(");
070
071        for (int i = 0; i < (msServices.length - 1); i++) {
072            buf.append(msServices[i]);
073            buf.append(',');
074        }
075        buf.append(msServices[msServices.length - 1]);
076
077        buf.append(")?randomize=false&maxReconnectAttempts=0");
078
079        super.setServices(new String[]{buf.toString()});
080    }
081
082}