RabbitMQ(九)——消息持久化

RabbitMQ系列

RabbitMQ(一)——简介

RabbitMQ(二)——模式类型

RabbitMQ(三)——简单模式

RabbitMQ(四)——工作队列模式

RabbitMQ(五)——发布订阅模式

RabbitMQ(六)——路由模式

RabbitMQ(七)——主题模式

RabbitMQ(八)——消息确认

RabbitMQ(九)——消息持久化

RabbitMQ(十)——消息优先级

前言

　　对于交换机(exchange)与队列(queue)的持久化只需要将durable属性设置为true即可，当重启RabbitMQ服务后，交换机和队列都会恢复，但是当只有队列的durable属性设置为true时，重启后会造成消息丢失。

实现

　　首先是设置生产者的交换机和队列的持久化属性durable为true，再设置IBasicProperties.Persistent为true，发布时带上BasicProperties

        //1.创建连接工厂
            ConnectionFactory factory = new ConnectionFactory()
            {
                HostName = "127.0.0.1",
                UserName = "guest",
                Password = "guest"
            };
            //2.创建连接
            using (var connection = factory.CreateConnection())
            //3.创建管道
            using (var channel = connection.CreateModel())
            {
                //4.创建交换器
                channel.ExchangeDeclare("exchange", "fanout");
                channel.QueueDeclare("SMSqueue",true,false,false,null);
                channel.QueueDeclare("SMAILqueue", true, false, false, null);
                channel.QueueBind("SMSqueue", "exchange","",null);
                channel.QueueBind("SMAILqueue", "exchange","",null);
                //消息持久化
                //IBasicProperties basicProperties = channel.CreateBasicProperties();
                //basicProperties.Persistent = true;
                string msg = "";

                for (int i = 0; i < 10; i++)
                {
                    msg = $"发布消息{i}";
                    var body = Encoding.UTF8.GetBytes(msg);
                    channel.BasicPublish("exchange", "", null, body);
                    Console.WriteLine($"发布成功：{msg}");
                    Thread.Sleep(1000);
                }
                Console.ReadKey();
            }    

　　可以看到10条消息写入成功

　　

　　现在重启下RabbitMQ服务

　　可以看到上图中的消息在重启后没有消费就丢失了，下面进行消息的持久化，交换机和队列的durable都设置为true。

　　修改创建交换机代码，将默认的false设置为true，basicProperties.Persistent设置为true

//1.创建连接工厂
            ConnectionFactory factory = new ConnectionFactory()
            {
                HostName = "127.0.0.1",
                UserName = "guest",
                Password = "guest"
            };
            //2.创建连接
            using (var connection = factory.CreateConnection())
            //3.创建管道
            using (var channel = connection.CreateModel())
            {
                //4.创建交换器
                channel.ExchangeDeclare("exchange", "fanout",true);
                channel.QueueDeclare("SMSqueue",true,false,false,null);
                channel.QueueDeclare("SMAILqueue", true, false, false, null);
                channel.QueueBind("SMSqueue", "exchange","",null);
                channel.QueueBind("SMAILqueue", "exchange","",null);

                IBasicProperties basicProperties = channel.CreateBasicProperties();
                basicProperties.Persistent = true;

                string msg = "";

                for (int i = 0; i < 10; i++)
                {
                    msg = $"发布消息{i}";
                    var body = Encoding.UTF8.GetBytes(msg);
                    channel.BasicPublish("exchange", "", basicProperties, body);
                    Console.WriteLine($"发布成功：{msg}");
                    Thread.Sleep(1000);
                }
                Console.ReadKey();
            }

　　

　　发布消息和重启之后都是是10条消息。

　　这样就完成了消息持久的设置了