Detailed explanation of graphic code for RabbitMQ application in C#-C#.Net Tutorial-php.cn

Detailed explanation of graphic code for RabbitMQ application in C#

黄舟

Release： 2017-07-27 16:10:30

Original

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rabbitmq is not described as and how to install it. Baidu knows it at once, just pay more attention in terms of configuration.

Without further ado, let’s start with a simple example code

Sender:

            ConnectionFactory factory = new ConnectionFactory { HostName = "hostname", UserName = "root", Password = "root001", VirtualHost = "hostserver" }; 
                       using (IConnection conn = factory.CreateConnection())
            {                using (IModel im = conn.CreateModel())
                {
                    im.ExchangeDeclare("rabbitmq_route", ExchangeType.Direct);
                    im.QueueDeclare("rabbitmq_query", false, false, false, null);
                    im.QueueBind("rabbitmq_query", "rabbitmq_route", ExchangeType.Direct, null);                    
                    for (int i = 0; i < 1000; i++)
                    {                        byte[] message = Encoding.UTF8.GetBytes("Hello Lv");
                        im.BasicPublish("rabbitmq_route", ExchangeType.Direct, null, message);
                        Console.WriteLine("send:" + i);
                    }
                }
            }

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Receiver:

            ConnectionFactory factory = new ConnectionFactory { HostName = "hostname", UserName = "root", Password = "root001", VirtualHost = "hostserver" }; 
                       using (IConnection conn = factory.CreateConnection())
            {                using (IModel im = conn.CreateModel())
                {                    while (true)
                    {
                        BasicGetResult res = im.BasicGet("rabbitmq_query", true);                        
                        if (res != null)
                        {
                            Console.WriteLine("receiver:"+UTF8Encoding.UTF8.GetString(res.Body));
                        }
                    }
                }
            }

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Send a thousand sending one at one time, the sending process is fast, and it is relatively slow when receiving.

Just end it.

It can be seen that when two receivers are running at the same time, RabbitMQ will Distribute each message sequentially. When each confirmation is received, the message will be deleted, and then the next one will be distributed to the next recipient, mainly because of RabbitMQ's

cyclic distribution

mechanism.

. When multiple receivers, due to the reasons of cycle distribution, the news is almost two receiving end.

So how to distribute the same message to multiple receivers.

Modify the sending terminal code:

            ConnectionFactory factory = new ConnectionFactory { HostName = "hostname", UserName = "root", Password = "root001", VirtualHost = "host" }; 
                       using (IConnection conn = factory.CreateConnection())
            {                using (IModel im = conn.CreateModel())
                {
                    im.ExchangeDeclare("rabbitmq_route_Fanout", ExchangeType.Fanout);// 路由                    
                    int i = 0;                    
                    while (true)
                    {
                        Thread.Sleep(1000);
                        ++i;                        
                        byte[] message = Encoding.UTF8.GetBytes(i.ToString());
                        im.BasicPublish("rabbitmq_route_Fanout", "", null, message);
                        Console.WriteLine("send:" + i.ToString());
                    }
                }
            }

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Compared with the above -mentioned method, you will find that there are two sections of code behind the code annotation. After this method, there is no need to specify the queue name. The purpose of pausing for one second is to facilitate viewing the results and avoid refreshing too quickly.

Let's take a look at the receiving end code:

# When a new receiving end connection (consumer), you need to declare a new queue, Comment on code 1. When RabbitMQ declares a queue, it will automatically generate one if you do not specify a name, which is good.

When there are two receivers, the running results are in line with expectations.

What are the disadvantages? You will know after running it yourself.

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