RabbitMQ~消费者实时与消息服务器保持通话

来源：互联网发布：组合最优化理论与算法编辑：程序博客网时间：2024/05/16 01:38

这个文章主要介绍简单的消费者的实现,rabbitMQ实现的消费者可以对消息服务器进行实时监听,当有消息(生产者把消息推到服务器上之后),消费者可以自动去消费它,这通常是开启一个进程去维护这个对话,它与消息服务器保持一个TCP的长连接,整个这个过程于rabbitMQ为我们提供,程序开发人员只需要实现自己的回调方法即可.

简单的rabbitMQ消费者

    /// <summary>    /// 消息消费者    /// </summary>    public class RabbitMqSubscriber : Lind.DDD.Commons.DisposableBase    {        private readonly string exchangeName;        private readonly string queueName;        private readonly IConnection connection;        private readonly IModel channel;        private bool disposed;        /// <summary>        /// 从消息服务器拉到消息后触发        /// </summary>        public event EventHandler<MessageReceivedEventArgs> MessageReceived;        /// <summary>        /// Initializes a new instance of <c>RabbitMqMessageSubscriber</c> class.        /// </summary>        /// <param name="uri"></param>        /// <param name="exchangeName"></param>        /// <param name="queueName"></param>        public RabbitMqSubscriber(string uri, string queueName, string userName = "", string password = "")        {            this.exchangeName = exchangeName;            this.queueName = queueName;            var factory = new ConnectionFactory() { Uri = uri };            if (!string.IsNullOrWhiteSpace(userName))                factory.UserName = userName;            if (!string.IsNullOrWhiteSpace(password))                factory.Password = password;            this.connection = factory.CreateConnection();            this.channel = connection.CreateModel();        }        public void Subscribe()        {            channel.QueueDeclare(                queue: this.queueName,                 durable: false,//持久化                exclusive: false, //独占,只能被一个consumer使用                autoDelete: false,//自己删除,在最后一个consumer完成后删除它                arguments: null);            var consumer = new EventingBasicConsumer(channel);            consumer.Received += (sender, e) =>            {                var body = e.Body;                var json = Encoding.UTF8.GetString(body);                var message = JsonConvert.DeserializeObject(json, new JsonSerializerSettings { TypeNameHandling = TypeNameHandling.All });                this.OnMessageReceived(new MessageReceivedEventArgs(message));                channel.BasicAck(e.DeliveryTag, multiple: false);            };            channel.BasicConsume(queue: queueName,                                 noAck: false,                                 consumer: consumer);        }        private void OnMessageReceived(MessageReceivedEventArgs e)        {            this.MessageReceived?.Invoke(this, e);        }        protected override void Finalize(bool disposing)        {            if (disposing)            {                if (!disposed)                {                    this.channel.Dispose();                    this.connection.Dispose();                    disposed = true;                }            }        }    }

简单调用

   class Program    {        static void Main(string[] args)        {            var subscriber = new Lind.DDD.RabbitMq.RabbitMqSubscriber("amqp://localhost:5672", "zzl");            subscriber.MessageReceived += Subscriber_MessageReceived;            subscriber.Subscribe();            Console.ReadKey();        }        private static void Subscriber_MessageReceived(object sender, RabbitMq.MessageReceivedEventArgs e)        {            Console.WriteLine("消费者2->消费了一个消息{0}", e.Message);            Lind.DDD.Logger.LoggerFactory.Instance.Logger_Debug("消费者2->消费了一个消息{0}" + e.Message);            Thread.Sleep(2000);        }    }

实时拉消息

RabbitMQ消息模型

通过上面图我们可以更容易和清晰的去理解rabbitmq的工作流程.

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