DelayedCalls block any other call from the same connection ?

[HelgeLange]

Hi Danijel,

I implemented my callback through DelayedCalls instead of a callback connection to the client.
I have a server that hosts several databases and normally some 50-100 clients connect to it using one of the databases.
Now sometimes the users posts a job (which I changed from an own implementation last night to serialized TRtcQuickJobs). When the Quickjob is done, all clients using the same database as the quickjob needs to be informed about the result. Before I used a callback connection but I changed it this morning to DelayedCalls. It works great and is easy to implement (as most of the RTC stuff), but I noticed something :

I have 1 function that informs the server that a job has to be done and in which database.
Then I have another function that gets the result through the delayed call. It has a delay of 30 seconds.

the first function comes in only when the delayed call is returning to the caller, like it's stuck.

Is multi-threaded a solution for that problem ? I rather ask, before I change everything to multi-threaded in code

Thanks in advance,
Helge

[D.Tkalcec (RTC)]

That is correct.

When using DelayedCalls, you need a dedicated connection. The whole idea behind Delayed Calls is to send a request to the Server and keep the connection open, without sending a response, until the Server has Data ready to be sent back (a response), or a timeout occures. Because the Server needs a connection from the Client ready to receive a response immediately when a Result is ready, the connection can NOT be used for any other kind of communication when it is being used for a Delayed Call. So ... when you are working with Delayed Calls, you will always need at least two separate connections. One for the DelayedCall and the other one for making all other kinds of remote calls to the Server.

Best Regards,
Danijel Tlakcec

[HelgeLange]

So multi threaded will not work at all? Only a secondary connection ?
The connection is another HttpServer or just another ServerModule ?

Helge

[D.Tkalcec (RTC)]

MultiThreaded has nothing to do with it. The Server also does NOT require changing. This is a Client-side requirement. The Client needs a separate physical connection for use with DelayedCalls. A secondary dedicated TRtcHttpClient component on the Client, just for DelayedCalls, so there will be a separate physical connection from the Client to the Server for making remote function calls where DelayedCalls are used on the Server.

Check the RTC Messenger Client and Server Demos if you need a hands-on example.

Best Regards,
Danijel Tkalcec

[HelgeLange]

Ok, thanks, that helps

Done, works like a charm. Cannot tell you enough how much code and work your components save me. Really good work!