Long polling Stop other request for 1 or 2 minutes

Question

During create a chat system , I use a long life request to get message , and use a jquery request to send message like this :

*Send: *

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Answer 1

The problem is GetRecords may never return. Which, unless you are using something like WebSockets is an issue. It means the connection will never complete (until it times out) and you will more than likely not receive any data from it.

What you should do is let GetRecords return straight away, and then poll in your jQuery for new records every X seconds.

You could also try adding a Sleep in the while loop (as well as a maximum loop limit) to allow other threads to work in the system and to prevent an infinite loop. i.e.

int maxLoops = 50;
int loopNum = 0;
while (loopNum < maxLoops)
{
        var list = db.Commets.Where(rec => rec.Id > Id).Select(rec => new { Id = rec.Id, Str = rec.Str }).ToList();

        if (list.Count > 0)
            return list;

        Thread.Sleep(250); //Wait 1/4 of a second
        loopNum++;
}