是否SignalR服务器发送活动执行线程占有为每个连接？ [英] Does SignalR Server Sent Events implementation occupy thread for each connection?

问题描述

当我使用signalR这回退到ServerSentEvents，我可以在小提琴手到服务器打开的连接等待数据分块的看，它意味着一个线程在这个时候被占用的服务器上？

When I use signalR which falls back to ServerSentEvents, and I can see on fiddler an open connection to the server waiting for chunked data, does it mean a thread is being occupied on the server at this time?

如果是这样，这是不是很有效，因为据我看到它。

If so, it is not quite efficient as far as I see it..

例如，我不会在服务器上写这样code，阻止线程：

For example I would not write such code in the server that blocks a thread:

public ActionResult ServerSentEvents
{
    DateTime currentdate = DateTime.Now;
    Response.ContentType = "text/event-stream";
    while (currentdate.AddMinutes(1) > DateTime.Now)
    {
        Response.Write(string.Format("data: {0}\n\n", DateTime.Now.ToString()));
        Response.Flush();
        System.Threading.Thread.Sleep(1000);
    }
}

难道SignalR做一些事情更有效率些？

Could it be that SignalR does something more efficiently here?

推荐答案

这看起来像MVC控制器code不SignalR枢纽code

That looks like MVC Controller code not SignalR Hub code

反正SignalR支持.NET 4.5的异步框架，所以你可以从该方法返回一个任务来代替，而有一个后台线程处理等待状态，当一个任务等待1000毫秒，你会继续这项任务。

Anyway, SignalR supports the async framework in .NET 4.5 so you could return a Task from that method instead and have one background thread handling the wait state and when a task has waited 1000 MS you will continue that task.

您应该永远有 Thread.sleep代码在requst线程，它完全杀死的可扩展性，而其之所以喜欢实体框架和ADO.NET框架支持异步操作（如数据库AI / O操作是就像一个 Thread.sleep代码）

You should never ever have Thread.Sleep in a requst thread, it kills scalability completely, and its the reason why Frameworks like Entity Framework and ADO.NET supports async operations (A I/O operation like Database is just like a Thread.Sleep)

编辑：如果你没有任何理由要使用SignalR可以在MVC 3使用任务从MVC 4或AsyncController和更早版本。但我会建议SignalR，因为他们正在做的所有的管道为​​你

edit: If you for no reason want to use SignalR you can use Tasks from MVC 4 or the AsyncController in MVC 3 and earlier. But I would recommend SignalR since they are doing all the plumbing for you

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