.Net实现延迟队列

-- 取消注释
notify-keyspace-events Ex

-- 注释
#notify-keyspace-events ""

 .\redis-server.exe  .\redis.windows.conf

  redis:
    container_name: redis
    image: redis
    hostname: redis
    restart: always
    ports: 
      - "6379:6379"
    volumes: 
      - $PWD/redis/redis.conf:/etc/redis.conf
      - /root/common-docker-compose/redis/data:/data
    command: 
      /bin/bash -c "redis-server /etc/redis.conf" #启动执行指定的redis.conf文件

-- windows
.\redis-cli
 
-- linux
docker exec -it 容器标识 redis-cli
 
psubscribe __keyevent@0__:expired

var connectionMultiplexer = ConnectionMultiplexer.Connect(_redisConnection);
var db = connectionMultiplexer.GetDatabase(0);

db.StringSet("orderno:123456", "订单创建", TimeSpan.FromSeconds(10));
Console.WriteLine("开始订阅");

var subscriber = connectionMultiplexer.GetSubscriber();

//订阅库0的过期通知事件
subscriber.Subscribe("__keyevent@0__:expired", (channel, key) =>
{
    Console.WriteLine($"key过期 channel:{channel} key:{key}");
});

Console.ReadLine();

public class RedisListenService : BackgroundService
{
    private readonly ISubscriber _subscriber;

    public RedisListenService(IServiceScopeFactory serviceScopeFactory)
    {
        using var scope = serviceScopeFactory.CreateScope();
        var configuration = scope.ServiceProvider.GetRequiredService<IConfiguration>();

        var connectionMultiplexer = ConnectionMultiplexer.Connect(configuration["redis"]);
        var db = connectionMultiplexer.GetDatabase(0);
        _subscriber = connectionMultiplexer.GetSubscriber();
    }

    protected override Task ExecuteAsync(CancellationToken stoppingToken)
    {
        //订阅库0的过期通知事件
        _subscriber.Subscribe("__keyevent@0__:expired", (channel, key) =>
        {
            Console.WriteLine($"key过期 channel:{channel} key:{key}");
        });

        return Task.CompletedTask;
    }
}

services.AddHostedService<RedisListenService>();

docker run -d --name myrabbit -p 9005:15672 -p 5672:5672  -e RABBITMQ_DEFAULT_VHOST=customer -e RABBITMQ_DEFAULT_USER=admin -e RABBITMQ_DEFAULT_PASS=123456 -v d:/Download/rabbitmq_delayed_message_exchange-3.10.2.ez:/plugins/rabbitmq_delayed_message_exchange-3.10.2.ez  rabbitmq:3-management-alpine

docker exec -it 容器名称/标识 bash

rabbitmq-plugins enable rabbitmq_delayed_message_exchange

rabbitmq-plugins list

rabbitmq-server restart

[HttpGet("send/delay")]
public string SendDelayedMessage()
{
    var factory = new ConnectionFactory()
    {
        HostName = "localhost",//IP地址
        Port = 5672,//端口号
        UserName = "admin",//用户账号
        Password = "123456",//用户密码
        VirtualHost = "customer"
    };
    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);

    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", time }
            };
    channel.BasicPublish(exchange: exchangeName, routingKey: routingkey, basicProperties: props, body: body);
    Console.WriteLine("成功发送消息:" + message);

    return "success";
}

public class RabbitmqDelayedHostService : BackgroundService
{
    private readonly IModel _channel;
    private readonly IConnection _connection;

    public RabbitmqDelayedHostService()
    {
        var connFactory = new ConnectionFactory//创建连接工厂对象
        {
            HostName = "localhost",//IP地址
            Port = 5672,//端口号
            UserName = "admin",//用户账号
            Password = "123456",//用户密码
            VirtualHost = "customer"
        };
        _connection = connFactory.CreateConnection();
        _channel = _connection.CreateModel();

        //交换机名称
        var exchangeName = "exchangeDelayed";
        var queueName = "delay_queueName";
        var routingkey = "delay.delay";
        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);
        //声明为手动确认
        _channel.BasicQos(0, 1, false);
    }

    protected override Task ExecuteAsync(CancellationToken stoppingToken)
    {
        var queueName = "delay_queueName";

        var consumer = new EventingBasicConsumer(_channel);
        consumer.Received += (model, ea) =>
        {
            var message = Encoding.UTF8.GetString(ea.Body.ToArray());
            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} ");

            //手动确认
            _channel.BasicAck(ea.DeliveryTag, true);
        };
        _channel.BasicConsume(queue: queueName, autoAck: false, consumer: consumer);

        return Task.CompletedTask;
    }

    public override void Dispose()
    {
        _connection.Dispose();
        _channel.Dispose();
        base.Dispose();
    }
}

services.AddHostedService<RabbitmqDelayedHostService>();

BackgroundJob.Schedule(
  () => Console.WriteLine("Delayed!"),
   TimeSpan.FromDays(7));