Timer event that needs to start every Tuesday

Camunda 8 Topics Discussion & Questions
1

Hi,
I would start timer on every Tuesday, I saw same another topic for a monthly start and there was the answer PT1M

So will it be work something like PT2D ?

Thank you!

1 Like
2

@philipp.ossler is the expert, but I think that duration will do every two days.

3

I would suggest a feel expression where you calculate the duration to the next tuesday.

Greets
Chris

4

Any hints on what that looks like?

5

Currently can’t give more input sorry. I’m not on my pc to try it out.

6

I can try in the evening. :slight_smile:

7

Correct. Use R/P7D to schedule the timer every week.

The interesting questing is how to configure the start time to run on Tuesdays.
We have an open issue that addresses the problem: Feature Request: On Timer events add scheduling at specific time · Issue #3038 · camunda/zeebe · GitHub

Nice idea :+1:

I crafted a FEEL expression to calculate the duration until the next Tuesday at 08:00:00.

(for x in 1..7 return date and time(today(),time("08:00:00Z")) + duration("P"+string(x)+"D"))[day of week(item) = "Tuesday"][1] - now()

You could use the expression for a timer in the workflow and then loop back to the timer to wait until the next Tuesday. Or, use it in front of the cycle timer that runs every 7 days.

In more detail:

  • create a list of data-time values for the next 7 days and set the time to 08:00:00
for x in 1..7 return date and time(today(),time("08:00:00Z")) + duration("P"+string(x)+"D")
//  List(2020-12-19T08:00Z, 2020-12-20T08:00Z, 2020-12-21T08:00Z, 2020-12-22T08:00Z, 2020-12-23T08:00Z, 2020-12-24T08:00Z, 2020-12-25T08:00Z)
  • filter the list by a date-time on Tuesday
(for x in 1..7 return date and time(today(),time("08:00:00Z")) + duration("P"+string(x)+"D"))[day of week(item) = "Tuesday"]
//  List(2020-12-22T08:00Z)
  • return the only element of the list
(for x in 1..7 return date and time(today(),time("08:00:00Z")) + duration("P"+string(x)+"D"))[day of week(item) = "Tuesday"][1]
//  2020-12-22T08:00Z
  • calculate the duration between the date-time and now
(for x in 1..7 return date and time(today(),time("08:00:00Z")) + duration("P"+string(x)+"D"))[day of week(item) = "Tuesday"][1] - now()
//  PT81H55M39.422615S

Does this help you?

4 Likes
8

Hi, Thanks for your answers!

Could you recommend me some environment to test and debug the similar expressions? Maybe some online editor?
Thanks!

9

The easiest way to test FEEL expressions is the FEEL REPL. See here: https://github.com/camunda/feel-scala#feel-repl

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