#1 2020-12-10 14:47:41

leus
Member
Registered: 2012-09-05
Posts: 79

TimerEnable example?

Hello,

Can anybody please share an example on how to use TimerEnable / TimerDisable? I cannot find any example or documentation about it. The commentary on the source code says the following:

Define a task running on a periodic number of seconds in a background thread

  • could be used to run background maintenance or monitoring tasks on this TSQLRest instance, at a low pace (typically every few minutes)

  • will instantiate and run a shared TSynBackgroundTimer instance for this TSQLRest, so all tasks will share the very same thread

  • you can run BackgroundTimer.EnQueue or ExecuteNow methods to implement a FIFO queue, or force immediate execution of the process

  • will call BeginCurrentThread/EndCurrentThread as expected e.g. by logs

But no mention on how to actually use it. Any example on how to use it?

Last edited by leus (2020-12-10 14:51:18)

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#2 2020-12-10 14:59:12

ab
Administrator
From: France
Registered: 2010-06-21
Posts: 14,372
Website

Re: TimerEnable example?

Just call TimerEnable() with the proper callback which will be raised at the given pace.

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#3 2020-12-10 15:06:09

leus
Member
Registered: 2012-09-05
Posts: 79

Re: TimerEnable example?

That's the question.

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#4 2020-12-10 16:02:47

tbo
Member
Registered: 2015-04-20
Posts: 340

Re: TimerEnable example?

I use it in a small application as follows:

procedure TDWSRestServer.DownloadDWData(pmSender: TSynBackgroundTimer; pmEvent: TWaitResult; const pmcMsg: RawUTF8);
const
  URL_TEMPLATE = 'https://...';
var
  log: ISynLog;
  url: SockString;
  content: SockString;
begin
  log := LogClass.Enter(Self, 'DownloadDWData');
  with FRestServiceSettings do
    url := StringToAnsi7(FormatString(URL_TEMPLATE, [DWUserName, DWUserPassword, DWUserAPIToken]));

  content := HttpGet(url);
  ...
end;

procedure TDWSRestServer.Start;
var
  timer: TSynBackgroundTimer;
begin
  timer := TimerEnable(DownloadDWData, FRestServiceSettings.DataUpdateInterval);
  if Assigned(timer) then
    timer.ExecuteNow(DownloadDWData);
end;

procedure TDWSRestServer.Stop;
begin
  TimerDisable(DownloadDWData);
end;

With best regards
Thomas

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#5 2020-12-10 16:50:13

leus
Member
Registered: 2012-09-05
Posts: 79

Re: TimerEnable example?

I did this, because my task lives inside my service (not in the server). Is this right?

someService := T.Create();
aRestServer.ServiceDefine(someService, [ISomeService]);
aRestServer.TimerEnable(someService.MyBackgroundTask, 360);

Last edited by leus (2020-12-10 16:50:35)

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#6 2020-12-10 18:42:07

ab
Administrator
From: France
Registered: 2010-06-21
Posts: 14,372
Website

Re: TimerEnable example?

Sounds just fine.

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#7 2024-06-19 01:52:17

zen010101
Member
Registered: 2024-06-15
Posts: 1

Re: TimerEnable example?

I have some inquiries regarding this previous thread:

Does a TSynBackgroundTimer utilize a thread to sequentially execute aOnProcess: TOnSynBackgroundTimerProcess?

How can I employ separate threads to execute multiple tasks concurrently in the background? Is it possible to use multiple TSynBackgroundTimer instances for this purpose? 

Would you please provide me with more examples?

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#8 2024-06-19 07:36:51

ab
Administrator
From: France
Registered: 2010-06-21
Posts: 14,372
Website

Re: TimerEnable example?

Each TSynBackgroundTimer maintain its own thread, in which you can run events.

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