Redis发布、订阅

    xiaoxiao2021-04-17  38

    Redis发布订阅

    发布订阅模式中发布消息的为publisher即发布者,接收消息的为subscriber即订阅者。在Redis中,所有的消息通过channel即频道进行发布,一个发布者可以向多个channel发布消息,一个订阅者也可以订阅多个channel。Redis不对消息进行持久化,如果消息发布时订阅者还没有进行订阅,则不会再收到此消息。

     

    发布订阅命令

    命令格式说明PUBLISHPUBLISH channel message发布message到指定的channelSUBSCRIBESUBSCRIBE channel [channel ...]订阅1个或多个指定的channelUNSUBSCRIBEUNSUBSCRIBE [channel [channel ...]]取消订阅1个或多个指定的channel,如果不指定channel退订所有通过SUBSCRIBE订阅的channelPSUBSCRIBEPSUBSCRIBE pattern [pattern ...]根据匹配模式订阅channelPUNSUBSCRIBEPUNSUBSCRIBE [pattern [pattern ...]]根据匹配模式取消订阅channel,如果不指定匹配模式退订所有通过PSUBSCRIBE订阅的channel

     

    subscribe不能重复订阅同一个channel,而psubscribe按照匹配模式订阅时有可能会多次订阅同一个channel。如果psubscribe多次订阅了同一个channel,发布者使用publish发布消息到此channel后,订阅者会多次收到此消息。

    unsubscribe只能退订subscribe订阅的channel,punsubscribe只能退订psubscribe订阅的channel。

    订阅方法

    // <summary> /// 订阅 /// </summary> public static void Subscription() { using (ServiceStack.Redis.RedisClient consumer = new RedisClient("192.168.210.36", 6379)) { //创建订阅 ServiceStack.Redis.IRedisSubscription subscription = consumer.CreateSubscription(); //接收消息处理Action subscription.OnMessage = (channel, msg) => { Console.WriteLine("频道【" + channel + "】订阅客户端接收消息:" + ":" + msg + " [" + DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss") + "]"); Console.WriteLine("订阅数:" + subscription.SubscriptionCount); Console.WriteLine("___________________________________________________________________"); }; //订阅事件处理 subscription.OnSubscribe = (channel) => { Console.WriteLine("订阅客户端:开始订阅" + channel); }; //取消订阅事件处理 subscription.OnUnSubscribe = (a) => { Console.WriteLine("订阅客户端:取消订阅"); }; //订阅频道 subscription.SubscribeToChannels("channel-1"); } }发布程序

    static void Main(string[] args) { Console.Title = "Redis发布、订阅服务"; RedisClient client = new RedisClient("192.168.210.36", 6379); while (true) { string input = Console.ReadLine(); client.PublishMessage("channel-1", input); } }

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