一段时间后调用方法而不会阻塞

Question

I'm making a webserver application, and I have a Listener class which waits for connections and spawns an HTTPConnection , passing it the new Socket created, each time a connect request is made. The HTTPConnection class waits for data asynchronously (using Socket.BeginReceive ).

I need the delayed execution for a timeout. If the client fails to send a full HTTP request after a certain amount of time, I want to close the connection. As soon as the HTTPConnection object is constructed, the waiting period should begin, then call a Timeout function if the client fails to send the request. Obviously, I can't have the constructor method paused for a few seconds, so the waiting needs to happen async. I also need to be able to cancel the task.

I could do new Thread(...) and all, but that's very poor design. Are there any other ways to schedule a method to be called later?

Answer 1

You could append all postponed events to some ordered data structure and have a background task checking at certain interval if there's a timeout event that have to be executed.

You could save these events in database also (if you have a lot of clients I imagine it could lead to high memory usage).

Also you background task could get all the expired events from the database and handle them at once.