Activity exceptions / Wrapped Exceptions

Community Support
1

Hey!

I am curios about how temporal handle the exception thrown in an activity, specific for the CanceledFailure, currently I am executing heartbeats as part of the activity process and then when a cancelation is requested heartbeat operation throw an exception and in my code I am wrapping the exception as cause of custom exception e.g ServiceException()

So I am wondering if temporal has some internal mechanism to detect the exception and also the causes of the exception.

Base in the functional test that I have executed seems like temporal understand the type of the exception events if its wrapped by another one, because when I cancel the workflow the activity get canceled and it is not retried.

2

Temporal converts an exception (that is not ApplicationFailure) to an ApplicationFailure and wraps it in an ActivityFailure when delivering it to the workflow.

3

Got it, my doubt is more about how temporal known that the exception thrown was because a cancellation and not other exception.

As I am currently wrapping all the exception in a own exception I would like to know if I should unwrapped or not.

4

I would recommend throwing ApplicationFailure directly as it allows attaching details argument.