I have tried the External Task Pattern for the Camunda workflow engine. I understand that external tasks are performed by some other Workers and the “topic” name is the main thing between the BPMN engine and the Worker process.
I am confused with the word “topic” and “subscription” mechanism. Is it really a messaging queue kind of topic? What is the actual implementation/technology behind this “topic” name, which we specify in External Task configuration and then same used in Worker to subscribe to the topic?