Redis学习笔记~分布式的Pub/Sub模式

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redis的客户端有很多,这次用它的pub/sub发布与订阅我选择了StackExchange.Redis,发布与订阅大家应该很清楚了,首先一个订阅者,订阅一个服务,服务执行一些处理程序(可能是写个日志,插入个数据,发个email)然后当另一个项目的某个业务发布这个服务后,被订阅的程序将会被执行,这个听起来很有意思,redis有好的实现了这个pub/sub功能。

看一下结构图

 

Sub订阅(消息消费者)

对于订阅方,这里类似于一个服务,它会长期运行着,被启动后动态订阅一些服务进来,以便以后再被其它服务调用

        //sub a function in A-project
            PubSubManager.Instance.Subscribe("UserLog", (msg) =>
            {
                //订阅者处理自己的业务逻辑,这相关于队列服务要干的事
                Console.WriteLine(msg);
            });

Pub发布(消息生产者)

而对于其它项目,如A网站,它可能在被在POST动作后发布这个UserLog的服务,这时上面的订阅方将会消费它(消费者模式),或者服务代码被执行!

     [HttpPost]
        public ActionResult Index(string user)
        {
            PubSubManager.Instance.Publish("UserLog", user + "这个用户提交表单了");
            return View();
        }

对于一直运行的服务,将会收到来自不同项目的消息,而它只负责消费它!

Lind.DDD.PublishSubscribe

封装了一些标准的pub/sub方法,它可以有多种实现方法,本例使用redis这个中间件

   /// <summary>
    /// 发布订阅的接口规则
    /// </summary>
    public interface IPubSub
    {
        /// <summary>
        /// 发布,有顺序,对象源是字符串
        /// </summary>
        /// <param name="channel"></param>
        /// <param name="value"></param>
        void Publish(string channel, string value);
        /// <summary>
        /// 订阅,对象源是字符串
        /// </summary>
        /// <param name="channel"></param>
        /// <param name="action"></param>
        void Subscribe(string channel, Action<string> action);
        /// <summary>
        /// 异步发布,无顺序,对象源是字符串
        /// </summary>
        /// <param name="channel"></param>
        /// <param name="value"></param>
        void PublishAsync(string channel, string value);
        /// <summary>
        /// 异步订阅,无顺序,对象源是字符串
        /// </summary>
        /// <param name="channel"></param>
        /// <param name="action"></param>
        void SubscribeAsync(string channel, Action<string> action);

        /// <summary>
        /// 发布,有顺序,对象源是Byte[]
        /// </summary>
        /// <param name="channel"></param>
        /// <param name="value"></param>
        void PublishByte(string channel, byte[] value);
        /// <summary>
        /// 订阅,对象源是Byte[]
        /// </summary>
        /// <param name="channel"></param>
        /// <param name="action"></param>
        void SubscribeByte(string channel, Action<byte[]> action);
        /// <summary>
        /// 异步发布,有顺序,对象源是Byte[]
        /// </summary>
        /// <param name="channel"></param>
        /// <param name="value"></param>
        void PublishByteAsync(string channel, byte[] value);
        /// <summary>
        /// 异步订阅,对象源是Byte[]
        /// </summary>
        /// <param name="channel"></param>
        /// <param name="action"></param>
        void SubscribeByteAsync(string channel, Action<byte[]> action);

        /// <summary>
        /// 发布,有顺序,对象源是泛型对象
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="channel"></param>
        /// <param name="value"></param>
        void Publish<T>(string channel, T value);
        /// <summary>
        /// 订阅,对象源是泛型对象
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="channel"></param>
        /// <param name="action"></param>
        void Subscribe<T>(string channel, Action<T> action);
        /// <summary>
        /// 异步发布,有顺序,对象源是泛型对象
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="channel"></param>
        /// <param name="value"></param>
        void PublishAsync<T>(string channel, T value);
        /// <summary>
        /// 异步订阅,对象源是泛型对象
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="channel"></param>
        /// <param name="action"></param>
        void SubscribeAsync<T>(string channel, Action<T> action);
        /// <summary>
        /// 取消指定订阅
        /// </summary>
        /// <param name="channel"></param>
        void UnSubscribe(string channel);
        /// <summary>
        /// 取消所有订阅
        /// </summary>
        /// <param name="channel"></param>
        void UnSubscribeAll();
    }

 

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posted @ 2016-04-12 17:04 张占岭 阅读(...) 评论(...) 编辑 收藏