Adding/Removing Listeners at runtime

Camunda 7 Topics Discussion & Questions
1

Is it possible to add or remove the Task/Execution listeners at runtime in camunda?

In Activiti, It’s possible to add and remove additional event-listeners to the engine by using the API ( RuntimeService)

void addEventListener(ActivitiEventListener listenerToAdd);

void addEventListener(ActivitiEventListener listenerToAdd, ActivitiEventType... types);

void removeEventListener(ActivitiEventListener listenerToRemove);

But the listeners added at runtime are not retained when the engine is rebooted.

2

Hi @aravindhrs,

what is the reason that you want to add or remove Listeners at runtime?

Regards
Michael

3

Based on criteria,at runtime we need to execute listeners at certain sequence i.e., execution order

4

I would suggest adding the Listeners where they might be needed and set some boolean-flags in the process so that you can evaluate in the Listener if the logic should be executed or not. Like the following:

if(myProcessVariable == true) {
// execute logic
}

Otherwise it could be confusing for other persons when they see that there is a Listener involved that wasn’t modeled in the diagram but added later on.

Regards
Michael

5

@MichiDahm tahnks for the reply. I can achieve it through business rule task also, for “n” number of conditions. But the context of question is different :smile:

6