C#通过rabbitmq实现定时任务(延时队列)
作者:初夏的阳光丶
工作中经常会有定时任务的需求,常见的做法可以使用Timer、Quartz、Hangfire等组件,本文使用C#通过rabbitmq实现定时任务(延时队列),感兴趣的可以了解一下
本文主要讲解如何通过RabbitMQ实现定时任务(延时队列)
环境准备
需要在MQ中进行安装插件 地址链接
插件介绍地址:https://www.rabbitmq.com/blog/2015/04/16/scheduling-messages-with-rabbitmq/
使用场景
作为一个新的预支付订单被初始化放置,如果该订单在指定时间内未进行支付,则将被认为超时订单进行关闭处理;电商系统中应用较多,用户购买商品产生订单,但未进行支付,订单产生30分钟内未支付将关闭订单(且满足该场景数量庞大),不可能采用人工干预。
代码介绍
生产者
var factory = new ConnectionFactory() { Uri = new Uri("MQ地址") }; using var connection = factory.CreateConnection(); using var channel = connection.CreateModel(); var exchangeName = "delay-exchange"; var routingkey = "delay.delay"; var queueName = "delay_queueName"; //设置Exchange队列类型 var argMaps = new Dictionary<string, object>() { {"x-delayed-type", "topic"} }; //设置当前消息为延时队列 channel.ExchangeDeclare(exchange: exchangeName, type: "x-delayed-message", true, false, argMaps); channel.QueueDeclare(queueName, true, false, false, argMaps); channel.QueueBind(queueName, exchangeName, routingkey); for (int i = 0; i < 3; i++) { var time = 1000 * 5; var message = $@"发送时间为 {DateTime.Now:yyyy-MM-dd HH:mm:ss} 延时时间为:{time}"; var body = Encoding.UTF8.GetBytes(message); var props = channel.CreateBasicProperties(); //设置消息的过期时间 props.Headers = new Dictionary<string, object>() { { "x-delay", 5000 } }; channel.BasicPublish(exchange: exchangeName, routingKey: routingkey, basicProperties: props, body: body); Console.WriteLine(message); } Console.ReadLine();
消费者(自动绑定队列写法)
var factory = new ConnectionFactory() { Uri = new Uri(MQ地址) }; using var connection = factory.CreateConnection(); using var channel = connection.CreateModel(); var queueName = "delay_queueName"; channel.QueueDeclare(queueName, true, false, false, null); var consumer = new EventingBasicConsumer(channel); consumer.Received += (model, ea) => { var body = ea.Body; var message = Encoding.UTF8.GetString(body); var routingKey = ea.RoutingKey; Console.WriteLine($@"接受到消息的时间为 {DateTime.Now:yyyy-MM-dd HH:mm:ss},routingKey:{routingKey} message:{message} "); }; channel.BasicConsume(queue: queueName, autoAck: true, consumer: consumer); Console.ReadLine();
消费者(手动绑定队列写法)
var factory = new ConnectionFactory() { Uri = new Uri(MQ地址) }; using var connection = factory.CreateConnection(); using var channel = connection.CreateModel(); var exchangeName = "delay-exchange"; var routingkey = "delay.delay"; var queueName = "delay_queueName"; var autoDelete = true; var argMaps = new Dictionary<string, object>() { {"x-delayed-type", "topic"} }; channel.ExchangeDeclare(exchange: exchangeName, type: "x-delayed-message", true, false, argMaps); channel.QueueDeclare(queueName, true, false, false, argMaps); channel.QueueBind(queue: queueName, exchange: exchangeName, routingKey: routingkey); //channel.QueueDeclare(queueName, true, false, false, null); var consumer = new EventingBasicConsumer(channel); consumer.Received += (model, ea) => { var body = ea.Body; var message = Encoding.UTF8.GetString(body); var routingKey = ea.RoutingKey; Console.WriteLine($@"接受到消息的时间为 {DateTime.Now:yyyy-MM-dd HH:mm:ss},routingKey:{routingKey} message:{message} "); }; channel.BasicConsume(queue: queueName, autoAck: true, consumer: consumer); Console.ReadLine();
最终实现效果(两个消费者)
在上述实现中,其实主要靠以下参数来帮我们实现当前功能
声明Exchange中的 type: "x-delayed-message" 这个表明当前队列为延时消息队列
声明Exchange中arguments中的 {"x-delayed-type", "topic"} 当前表明当前队列为Topic模式
最后 我们在CreateBasicProperties的Header中设置 { "x-delay", 5000 }来达到消息延时的功能(单位为ms)
建议
如果使用当前模式来做定时任务,在要求消息不丢失的前提下,需要运维同学提供稳定的MQ环境
到此这篇关于C#通过rabbitmq实现定时任务(延时队列)的文章就介绍到这了,更多相关C# rabbitmq定时任务内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家!