Page Comparison

Objectives

This sample demonstrates how persistent queues can be created and used in Message Broker using the RabbitMQ .NetNET/C# client. It first introduces a sample .Net NET client by the name named "QueuePublisher", which is used to publish messages to a known, created queue in WSO2 Message Broker, and then introduces a sample .Net NET client by the name named "QueueConsumer" to receive messages and print message content in to the console.

Prerequisites

In order to To run this code sample, you need to must download and add the RabbitMQ.Client.dll file as a reference in your .net NET project. You can download that dll the file from this website http://www.rabbitmq.com/dotnet.html or herefrom the WSO2 repository.

Running the

...

sample

Prior to Before running following "the QueuePublisher " class,we need to must register at least one "one QueueConsumer " binding prior before sending messages to the queue This can be done by either,

...

queue by doing one of the following:

Log into WSO2 Message Broker management console and create a queue named 'test-queue' (

...

from the Main menu, choose Queues -> Add

...

). For more information, see Adding Queues.

...

OR
Run the QueueConsumer class depicted below

...

, which will register a binding to that queue. When you have run the QueueConsumer

...

class, you will see the queue created by

...

that class is visible in the management console

...

when you go to Queues -> Browse

...

.

Now using the following "QueuePublisher" .Net client, messages can be sent to 'test-queue' created earlier.

You are now ready to use the QueuePublisher .NET client to send messages to the queue.

Code Block

language	csharp

/*
*  Copyright (c) 2005-2010, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
*  WSO2 Inc. 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 System.Collections.Generic;
using System.Linq;
using System.Text;
using RabbitMQ.Client;
 
namespace RabbitMQ
{
    class QueuePublisher
    {
        static void Main(string[] args)
        {
            QueuePublisher publisher=new QueuePublisher();
            publisher.PublishMessage("This is a Test " +i);
            Console.WriteLine("Sent Message "+i);
           
            Console.ReadLine();
        }

 
        public void PublishMessage(string message)
        {
        //Setup the connection with the message broker
            ConnectionFactory factory = new ConnectionFactory();
            IProtocol protocol = Protocols.AMQP_0_8_QPID;
            factory.VirtualHost = "/carbon";
            factory.UserName = "admin";
            factory.Password = "admin";
            factory.HostName = "localhost";
            factory.Port = 5672;
            factory.Protocol = protocol;
 
            using (IConnection conn = factory.CreateConnection())
            {
                using (IModel ch = conn.CreateModel())
                {
 
        //Declare the exchange for the publisher.Here the exchange type is direct.
                    ch.ExchangeDeclare("amq.direct", "direct");
                 //Publish the message
                   ch.BasicPublish("amq.direct", "test-queue", null, Encoding.UTF8.GetBytes(message));                                        
                }
            }
        }
    }

Next, execute the following QueueConsumer .NET client, which allows you to receive messages from 'test-queue'.

Code Block

language	csharp

/*
*  Copyright (c) 2005-2010, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
*  WSO2 Inc. 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 System.Collections.Generic;
using System.Linq;
using System.Text;
using RabbitMQ.Client;
 
 
namespace QueueConsumer
{
    class QueueConsumer
    {
        static void Main(string[] args)
        {
            QueueConsumer qConsumer = new QueueConsumer();
            qConsumer.getMessage();
        }
 
        public void getMessage()
        {
 
        //Setup the connection with the message broker
            ConnectionFactory factory = new ConnectionFactory();
            IProtocol protocol = Protocols.AMQP_0_8_QPID;
            factory.VirtualHost = "/carbon";
            factory.UserName = "admin";
            factory.Password = "admin";
            factory.HostName = "localhost";
            factory.Port = 5672;
            factory.Protocol = protocol;
  
            using (IConnection conn = factory.CreateConnection())
            {
                using (IModel ch = conn.CreateModel())
                {
            //Declare a queue to retrieve messages.
                    ch.QueueDeclare("test-queue", true, false, false, null);
            //Create the binding between queue and the exchance
                    ch.QueueBind("test-queue", "amq.direct", "test-queue");
                    QueueingBasicConsumer consumer = new QueueingBasicConsumer(ch);
                    ch.BasicConsume("test-queue",false,consumer);
                    
                   
                    while (true)
                    {
                        try
                        {
                            RabbitMQ.Client.Events.BasicDeliverEventArgs e = (RabbitMQ.Client.Events.BasicDeliverEventArgs)consumer.Queue.Dequeue();
                            byte[] body = e.Body;
                            string message = Encoding.UTF8.GetString(body);
                            Console.WriteLine(message);
                            ch.BasicAck(e.DeliveryTag, false);
                        }
                        catch (OperationCanceledException e)
                        {
                            Console.WriteLine(e);
                            break;
                        }
                    }                   
                }
            }
        }        
    }
}

The received messages are printed to the console.

Versions Compared

Old Version 1

New Version Current

Key

Objectives

Prerequisites

Running the

sample