Limit number of concurrently running instances of a process definition

[firstpostcommenter]

You can use a service task of type “External”. And then clear the topic one by one using camunda timer that triggers the delegate(lets call this topicDelegate) which has the code to clear the messages in the topic one by one with some delay.

Prevent camunda process instances running same delegate concurrently

My understanding is that you run it in a different program (though there’s nothing saying you can’t run it in a distinct thread). You write it like a while-true loop… It looks for tasks to be done (fetch tasks on topic BigRESTQuery), locks the first one, does the work, sends the work to Camunda, then loops. If there’s nothing to be done, it sleeps for a bit, then loops. You’ll want to code a Java program that does something like: [Davey]

Instead of a fixed delay you can make sure when a camunda process instance completes it makes some kind of entry in some table that you can check in the “topicDelegate”