ACTIVEMQ Publish Subscription Mode

ACTIVEMQ Another mode of Sub/hub that is the publish subscription mode, is the Sub/hub is a drag n the meaning of the USB splitter. It means that a source is divided into n exits. As an example of the previous section, when an order is generated, the background n systems need to be linked, but there is a prerequisite to receive order information, then we need to publish a producer's message to n consumers.

Producers:

            try {//create the Connection Factory iconnectionfactory Factory =                New ConnectionFactory ("tcp://localhost:61616/"); using (iconnection connection = factory. CreateConnection ()) {//create the session using (ISession session = connection.                          CreateSession ()) {//create The Producer for the Topic/queue Imessageproducer prod = session.                        Createproducer (New Apache.NMS.ActiveMQ.Commands.ActiveMQTopic ("testing"));                        Send Messages int i = 0; while (! console.keyavailable) {itextmessage msg = prod.                            Createtextmessage (); Msg.                            Text = i.ToString ();                          Console.WriteLine ("Sending:" + i.tostring ());  Prod.                            Send (msg, Apache.NMS.MsgDeliveryMode.NonPersistent, Apache.NMS.MsgPriority.Normal, Timespan.minvalue);                            System.Threading.Thread.Sleep (5000);                        i++;            }}} console.readline ();                } catch (System.Exception e) {Console.WriteLine ("{0}", e.message);            Console.ReadLine (); }

Suppose the producer sends a message every 5 seconds:

Consumers:

        static void Main (string[] args) {try {//create the Connection FA                                    Ctory Iconnectionfactory factory = new ConnectionFactory ("tcp://localhost:61616/"); Create the connection using (iconnection connection = factory. CreateConnection ()) {connection.                      ClientId = "Testing Listener1"; Connection.                        Start (); Create the session using (ISession session = connection. CreateSession ()) {//create the Consumer Imessageco Nsumer consumer = session.                                                    Createdurableconsumer (New Apache.NMS.ActiveMQ.Commands.ActiveMQTopic ("testing"), "testing Listener1", NULL, FALSE); Consumer.                            Listener + = new MessageListener (Consumer_listener); Console.readLine (); } connection.                      Stop (); Connection.                  Close ();              }} catch (System.Exception e) {Console.WriteLine (e.message);              }} static void Consumer_listener (IMessage message) {try                  {itextmessage msg = (itextmessage) message; Console.WriteLine ("Receive:" + MSG.)             Text);              } catch (System.Exception e) {Console.WriteLine (e.message); }          }

Start a consumer:

We found out that he started from 15, instead of starting from scratch like in the previous section and starting another consumer:

We found that the message was received from the start, and the previous message was lost.

The overall status is as follows:

We observe the management interface:

Generated a testing topics, and Subscribers have 2 subscriptions that are testing:

This only needs to be received in a timely manner where the message needs to be subscribed.

Source code Download

ACTIVEMQ Publish Subscription Mode