【BlogBook书】10、RabbitMQ：消息队列

老张的哲学

发布于 2024-02-22 15:47:22

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发布于 2024-02-22 15:47:22

文章被收录于专栏：NetCore 从壹开始

框架中重点使用RabbitMQ和Kafka作为消息队列的中间件工具，本章节说明RabbitMQ的具体使用方式。

框架已经完整的封装了EventBus事件总线，如果想要使用更加完善的消息队列的方式，建议使用事件总线，当然也可以直接如下文进行使用。

一、相关的依赖注入配置

// 服务注册
builder.Services.AddRabbitMQSetup();

相关参数设置

"RabbitMQ": {
   "Enabled": true,
   "Connection": "xxxxx",
   "UserName": "admin",
   "Password": "admin",
   "Port": "5672",
   "RetryCount": 2
 },

二、使用方式

1、在任意位置做消息的发送

private readonly IRabbitMQPersistentConnection _persistentConnection;
 
 public ValuesController(IRabbitMQPersistentConnection persistentConnection)
 {
    _persistentConnection = persistentConnection;
 }


 /// <summary>
 /// 测试Rabbit消息队列发送
 /// </summary>
 [HttpGet]
 [AllowAnonymous]
 public IActionResult TestRabbitMqPublish()
 {
     if (!_persistentConnection.IsConnected)
     {
         _persistentConnection.TryConnect();
     }
     _persistentConnection.PublishMessage("Hello, RabbitMQ!", exchangeName: "blogcore", routingKey: "myRoutingKey");
     return Ok();
 }

2、在需要的地方进行消费

/// <summary>
 /// 测试Rabbit消息队列订阅
 /// </summary>
 [HttpGet]
 [AllowAnonymous]
 public IActionResult TestRabbitMqSubscribe()
 {
     if (!_persistentConnection.IsConnected)
     {
         _persistentConnection.TryConnect();
     }

     _persistentConnection.StartConsuming("myQueue");
     return Ok();
 }

3、具体的代码，请参考RabbitMQPersistentConnection.cs即可

 /// <summary>
 /// 发布消息
 /// </summary>
 /// <param name="message"></param>
 /// <param name="exchangeName"></param>
 /// <param name="routingKey"></param>
 public void PublishMessage(string message, string exchangeName, string routingKey)
 {
     using var channel = CreateModel();
     channel.ExchangeDeclare(exchange: exchangeName, type: ExchangeType.Direct, true);
     var body = Encoding.UTF8.GetBytes(message);
     channel.BasicPublish(exchange: exchangeName, routingKey: routingKey, basicProperties: null, body: body);
 }

 /// <summary>
 /// 订阅消息
 /// </summary>
 /// <param name="queueName"></param>
 public void StartConsuming(string queueName)
 {
     using var channel = CreateModel();
     channel.QueueDeclare(queue: queueName, durable: true, exclusive: false, autoDelete: false, arguments: null);

     var consumer = new AsyncEventingBasicConsumer(channel);
     consumer.Received += new AsyncEventHandler<BasicDeliverEventArgs>(
         async (a, b) =>
         {
             var Headers = b.BasicProperties.Headers;
             var msgBody = b.Body.ToArray();
             var message = Encoding.UTF8.GetString(msgBody);
             await Task.CompletedTask;
             Console.WriteLine("Received message: {0}", message);

             //bool Dealresult = await Dealer(b.Exchange, b.RoutingKey, msgBody, Headers);
             //if (Dealresult) channel.BasicAck(b.DeliveryTag, false);
             //else channel.BasicNack(b.DeliveryTag, false, true);
         }
         );

     channel.BasicConsume(queue: queueName, autoAck: true, consumer: consumer);

     Console.WriteLine("Consuming messages...");
 }

最终效果：

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