Writing to an exceptions log

[dpcroghan]

Danijel,

I have a question regarding RtcHttpServer when multithreading is true. I'd like to write any exceptions and connection errors to a text file. However, is this safe/possible if the server is multithreaded? Currently I have code like below in many of the event handlers, but what about problems that arise when the server is not in the main thread. Is there a way to log these. Forgive my lack of understanding about multithreading, I'm definitely in learning mode.

Thanks

procedure TForm2.RtcHttpServer1RequestNotAccepted(Sender: TRtcConnection);
begin
  if not Sender.inMainThread then
  begin
    Sender.Sync(RtcHttpServer1RequestNotAccepted);
  end
  else
  begin
     mmResult.Lines.Add('Request not accepted at ' + DateTimeToStr(now));
  end;
end;

[dpcroghan]

I think I should also ask, what are the pros and cons to setting multithreading to true or false for this component? Perhaps you can direct me to a resource that discusses this.

Thanks for providing excellent support.

[D.Tkalcec (RTC)]

You can use the "Log" and "XLog" procedures from the "rtcLog.pas" unit for writing log files. These procedures are thread-safe and work without the need to synchronize the code with the main thread.

When MultiThreaded=True, the RtcHttpServer component will be using a thread pool to execute its code and all events called by the component from background threads instead of doing it from the main thread. This allows the Server to process requests from multiple clients at the same time, without having to serialize them.

Best Regards,
Danijel Tkalcec

[dpcroghan]

Would you call StartLog() on FormCreate and StopLog on FormClose
or is it better to use StartLog() Log('Some message') StopLog() at each logging location?

Thanks.

[D.Tkalcec (RTC)]

I would call StartLog in main units initialization section or in the Project file (DPR).

There is no need to call StopLog, unless you want to ignore calls to Logging functions.

Best Regards,
Danijel Tkalcec

[dpcroghan]

Thanks Danijel.