rabbitmq系列——（5 消息确认 -- 消费者 自动确认和手动确认）

　　消费者消息确认分两种：自动确认、手动确认。

　　自动确认，消费者消费消息时，只要收到消息就回馈rabbitmq服务，

　　　　并且消费成功一条消息后，rabbitmq会认为所有消息全部成功消费，队列中移除所有消息，会导致消息的丢失；

　　手动确认，消费一条消息，回馈rabbitmq服务，rabbitmq只移除队列中消费了的消息；

1. 生产者

using RabbitMQMsgProducer.MessageProducer;
using Microsoft.Extensions.Configuration;
using System;
using System.IO;
using RabbitMQMsgProducer.ExchangeDemo;
using RabbitMQMsgProducer.MessageConfirm;

namespace RabbitMQMsgProducer
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                {
                    // 消费者 确认消息
                    ConsumerMsgConfirm.Send();
                }
                Console.ReadLine();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }
    }
}

using RabbitMQ.Client;
using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;

namespace RabbitMQMsgProducer.MessageConfirm
{
    public class ConsumerMsgConfirm
    {
        public static void Send()
        {
            var factory = new ConnectionFactory();
            factory.HostName = "localhost";//服务地址
            factory.UserName = "guest";//用户名
            factory.Password = "guest";//密码 
            string queueName = "ConsumerMsgConfirmQueue";
            string exchangeName = "ConsumerMsgConfirmExchange";
            string routingKeyName = "ConsumerMsgConfirmRoutingKey";
            using (var connection = factory.CreateConnection())
            {
                using (IModel channel = connection.CreateModel())
                {
                    // 声明队列
                    channel.QueueDeclare(queue: queueName, durable: true, exclusive: false, autoDelete: false, arguments: null);
                    // 声明交换机exchange
                    channel.ExchangeDeclare(exchange: exchangeName, type: ExchangeType.Direct, durable: true, autoDelete: false, arguments: null);
                    // 绑定exchange和queue
                    channel.QueueBind(queue: queueName, exchange: exchangeName, routingKey: routingKeyName);

                    for (int i = 1; i <= 100; i++)
                    {
                        string message = $"the message is : {i} .";
                        channel.BasicPublish(exchange: exchangeName, routingKey: routingKeyName, basicProperties: null, body: Encoding.UTF8.GetBytes(message));

                        Thread.Sleep(300);
                        Console.WriteLine($"the message is : {i} . is send .");
                    }
                    Console.Read();

                }
            }
        }
    }
}

2. 消费者

using RabbitMQMsgConsumer001.ExchangeDemo;
using RabbitMQMsgConsumer001.MessageConfirm;
using RabbitMQMsgConsumer001.MessageConsumer;
using System;
using System.Threading.Tasks;

namespace RabbitMQMsgConsumer001
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                {
                    // 消费者 确认消息
                    ConsumerMsgConfirm.Receive();
                }
                Console.ReadLine();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }
    }
}

using RabbitMQ.Client;
using RabbitMQ.Client.Events;
using System;
using System.Collections.Generic;
using System.Text;

namespace RabbitMQMsgConsumer001.MessageConfirm
{
    public class ConsumerMsgConfirm
    {
        public static void Receive()
        {
            var factory = new ConnectionFactory();
            factory.HostName = "localhost";//服务地址
            factory.UserName = "guest";//用户名
            factory.Password = "guest";//密码 
            string queueName = "ConsumerMsgConfirmQueue";
            string exchangeName = "ConsumerMsgConfirmExchange";
            string routingKeyName = "ConsumerMsgConfirmRoutingKey";
            using (var connection = factory.CreateConnection())
            {
                using (IModel channel = connection.CreateModel())
                {
                    Console.WriteLine("the consumer is ready !");
                    // 声明队列
                    channel.QueueDeclare(queue: queueName, durable: true, exclusive: false, autoDelete: false, arguments: null);
                    // 声明交换机exchange
                    channel.ExchangeDeclare(exchange: exchangeName, type: ExchangeType.Direct, durable: true, autoDelete: false, arguments: null);
                    // 绑定exchange和queue
                    channel.QueueBind(queue: queueName, exchange: exchangeName, routingKey: routingKeyName);

                    EventingBasicConsumer consumer = new EventingBasicConsumer(channel);
                    int i = 0;
                    consumer.Received += (model, ea) =>
                    {
                        var body = ea.Body;
                        var msg = Encoding.UTF8.GetString(body.ToArray());
                        #region 自动确认
                        // 调试运行 消费第一条消息时，rabbitmq中的队列已经显示全部消费了
                        // Console.WriteLine($"the consumer received : {msg} over.");
                        #endregion
                        #region 手动确认
                        if (i < 20)
                        {
                            // 手动确认 消息已消费，通知broker 可从队列中移除这条消息
                            channel.BasicAck(deliveryTag: ea.DeliveryTag, multiple: false);
                            Console.WriteLine($"the consumer received : {msg} over.");
                        }
                        else
                        {
                            // 模拟未消费此消息或消费失败，通知broker；
                            // requeue: true 重新写入队列； false 不重新写入，直接移除掉此消息
                            channel.BasicReject(deliveryTag: ea.DeliveryTag, requeue: true);
                        }
                        #endregion
                        i++;
                    };
                    {
                        // 1.消费者自动确认 autoAck:true
                        //channel.BasicConsume(queue: queueName, autoAck: true, consumer: consumer);
                    }
                    {
                        // 2.消费者手动确认 autoAck:false
                        channel.BasicConsume(queue: queueName, autoAck: false, consumer: consumer);
                    }

                    Console.Read();
                }
            }
        }
    }
}

3. 结果

 生产者，停止生产， 重新启动消费者，将继续消费20条消息：