Transaction Listeners stability as an internal API

[Mohamed_Elmaghraby]

I faced the same problem mentioned in these posts:

Why can't I see the end event during a process instance end event listener?

I have a model which defines a process end event listener. This listener is supposed to be executed when the instance is about to be finished. When the event listeners retrieves the list of all activities of the processInstance, i get the list of all activities BUT the endEvent. Do you know how to get the endEvent in this list of activities? NOTE: What I would like to obtain is the whole list of activities executed during the processInstance. I understand the endEvent must be in this list. In…

Global task listener gets called before task is persistent

Hi all We use Camunda global task listener by overriding “TaskListener getTaskListener()” method and it works create. But we have problem with that the task create events are created before the task object is actually commited? to the database. The problem is that the task create event is sent to rabitmq and another system immediately makes rest request to get that task and usually the request fails with error: “org.camunda.bpm.engine.rest.exception.InvalidRequestException: No matching task w…

The solution there worked for me but I came through this

Disclaimer: This is an internal API, meaning we do not guarantee any stability with upcoming releases.

So is there a plan to make it a pubic API and what about its stability guarantee?

Thanks in advance,

[StephenOTT]

They have been in their current form for “many years”, and are used throughout the engine. Strong chance they are not going to change in a breaking way anytime in your perceived future use.

[Mohamed_Elmaghraby]

Thanks for reply @StephenOTT
But I just wondering why not make it a public API, as there is no other way to be notified after transactions is committed which create a need for this to be used a lot.

[StephenOTT]

I don’t work for Camunda, but a guess would be that the engine’s public api is not about the awareness of the DB Transaction, rather it is focused on the business transaction of the execution: thus why the listeners on activities are focused on the Start and End of a activity (not the specific transaction).

What are you trying to accomplish by using a transaction listener?

[Mohamed_Elmaghraby]

I need to count tasks for all group users after each type of task listeners

• create
• assignment (claim, unclaimed)
• delete
  …

Getting the number of the tasks inside the task listener will be wrong in all cases

• create: not added yet
• claim: still available in the group tasks so counted for other group members
  …

I can take this into account in each case (do +1 or -1) in the appropriate case and for the appropriate users but there may be more cases in the future that we may need to take into consideration.

Transaction listeners can be a single unified solution to all of this but it has a problem that it listens to any commit (not specifically to the commit of the listener I am inside) which also may result in wrong behaviors sometimes.

Which I ask in another question if there is a possible solution for it

Is there a Transaction Listeners per event type

Regarding the solution described here Is there a way to listen on transactions concerned with specific events?! For example, in case I want to execute a function after the TaskListener.EVENTNAME_CREATE transaction is committed, using the transaction listener described in the previous solution @CamundaSelector(type = "userTask", event = TaskListener.EVENTNAME_CREATE) private final class OnCreationListener implements TaskListener { @Override public void notify(DelegateTask delegateTas…

[StephenOTT]

Why do you want to count the tasks after those events?