activemq Example

http://activemq.apache.org/nms/activemq-enumerate-destination-using-advisory-messages.html

This example shows you how to consume Advisory Messages from the Broker to
enumerate various destination types.

/*

 * 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.

 */



using System;

using Apache.NMS;

using Apache.NMS.Util;

using Apache.NMS.ActiveMQ;

using Apache.NMS.ActiveMQ.Commands;



namespace AdvisoryExample

{

    class AdvisoryExample

    {

        private IConnection connection;

        private ISession session;



        public const String QUEUE_ADVISORY_DESTINATION = "ActiveMQ.Advisory.Queue";

        public const String TOPIC_ADVISORY_DESTINATION = "ActiveMQ.Advisory.Topic";

        public const String TEMPQUEUE_ADVISORY_DESTINATION = "ActiveMQ.Advisory.TempQueue";

        public const String TEMPTOPIC_ADVISORY_DESTINATION = "ActiveMQ.Advisory.TempTopic";



        public const String ALLDEST_ADVISORY_DESTINATION = QUEUE_ADVISORY_DESTINATION + "," +

                                                           TOPIC_ADVISORY_DESTINATION + "," +

                                                           TEMPQUEUE_ADVISORY_DESTINATION + "," +

                                                           TEMPTOPIC_ADVISORY_DESTINATION;



        AdvisoryExample()

        {

            IConnectionFactory factory = new ConnectionFactory();



            connection = factory.CreateConnection();

            connection.Start();

            session = connection.CreateSession();

        }



        void EnumerateQueues()

        {

            Console.WriteLine("Listing all Queues on Broker:");



            IDestination dest = session.GetTopic(QUEUE_ADVISORY_DESTINATION);



            using(IMessageConsumer consumer = session.CreateConsumer(dest))

            {

                IMessage advisory;



                while((advisory = consumer.Receive(TimeSpan.FromMilliseconds(2000))) != null)

                {

                    ActiveMQMessage amqMsg = advisory as ActiveMQMessage;



                    if(amqMsg.DataStructure != null)

                    {

                        DestinationInfo info = amqMsg.DataStructure as DestinationInfo;

                        if(info != null)

                        {

                            Console.WriteLine("   Queue: " + info.Destination.ToString() );

                        }

                    }

                }

            }

            Console.WriteLine("Listing Complete.");

        }



        void EnumerateTopics()

        {

            Console.WriteLine("Listing all Topics on Broker:");



            IDestination dest = session.GetTopic(TOPIC_ADVISORY_DESTINATION);



            using(IMessageConsumer consumer = session.CreateConsumer(dest))

            {

                IMessage advisory;



                while((advisory = consumer.Receive(TimeSpan.FromMilliseconds(2000))) != null)

                {

                    ActiveMQMessage amqMsg = advisory as ActiveMQMessage;



                    if(amqMsg.DataStructure != null)

                    {

                        DestinationInfo info = amqMsg.DataStructure as DestinationInfo;

                        if(info != null)

                        {

                            Console.WriteLine("   Topic: " + info.Destination.ToString() );

                        }

                    }

                }

            }

            Console.WriteLine("Listing Complete.");

        }



        void EnumerateDestinations()

        {

            Console.WriteLine("Listing all Destinations on Broker:");



            IDestination dest = session.GetTopic(ALLDEST_ADVISORY_DESTINATION);



            using(IMessageConsumer consumer = session.CreateConsumer(dest))

            {

                IMessage advisory;



                while((advisory = consumer.Receive(TimeSpan.FromMilliseconds(2000))) != null)

                {

                    ActiveMQMessage amqMsg = advisory as ActiveMQMessage;



                    if(amqMsg.DataStructure != null)

                    {

                        DestinationInfo info = amqMsg.DataStructure as DestinationInfo;

                        if(info != null)

                        {

                            string destType = info.Destination.IsTopic ? "Topic" : "Qeue";

                            destType = info.Destination.IsTemporary ? "Temporary" + destType : destType;

                            Console.WriteLine("   " + destType + ": " + info.Destination.ToString() );

                        }

                    }

                }

            }

            Console.WriteLine("Listing Complete.");

        }



        void ShutDown()

        {

            session.Close();

            connection.Close();

        }



        public static void Main (string[] args)

        {

            AdvisoryExample ex = new AdvisoryExample();



            ex.EnumerateQueues();

            ex.EnumerateTopics();

            ex.EnumerateDestinations();

            ex.ShutDown();

        }

    }

}