events: add a task processing done event

[drev74]

Currently, only one event is supported, which signals the task state update.

It would be nicer to have another event, which signals the task processing done with either success or terminated status 💡

Upstream service would listen to it instead of processing any task change, including retries.

1. If you are ok with this, which name would the event be given ?
2. If you think it is necessary to add more events related to the sync with upstream logic, let's discuss 😃

[ripienaar]

Wouldn't the existing event tell you the same information?

You would get the existing event with TaskStateCompleted status, an additional event would just have the exact same information?

[drev74]

Here's what I have:

2025-04-27T23:41:53.757+0300    DEBUG   ajc     Received an Item with ID 2wKNsghMgUi196pJxs4g8jsXNxs
2025-04-27T23:41:53.759+0300    DEBUG   ajc     Publishing lifecycle event io.choria.asyncjobs.v1.task_state for task 2wKNsghMgUi196pJxs4g8jsXNxs to CHORIA_AJ.E.task_state.2
wKNsghMgUi196pJxs4g8jsXNxs                                                                                                                                                   
2025-04-27T23:41:53.760+0300    DEBUG   ajc     user: foomoo
2025-04-27T23:41:53.760+0300    DEBUG   ajc     Publishing lifecycle event io.choria.asyncjobs.v1.task_state for task 2wKNsghMgUi196pJxs4g8jsXNxs to CHORIA_AJ.E.task_state.2
wKNsghMgUi196pJxs4g8jsXNxs               

As I see, ajc issues a state change event as per your docs

However, I'm NOT interested in retries or intermediate states 🙄 and would like to save compute resources on reacting on every state update 🙏 . Whilst its possible to get the processing done result by checking the state, it would be convenient to catch the final result

[drev74]

My use case

I'm using a SSR UI framework, which is listening for ajc events and updates UI accordingly.

I can definitely use the current (single) event task_state, but it would be convenient for frontends just to pick the final result, check transaction status, check error message (if any) and update DOM UI 🆒

[ripienaar]

You'd have to be doing 10s of thousands of events to save any significant resources over just getting the current event surely? Are your frontends over some slow internet or something?

[drev74]

Okay, let me implement UI with the current event and I'll collect a more detailed feedback. brb