How can I get the process instance id from the previous event?

[CRA]

For example, if I am in a call activity and want to get the process instance of the previous task, how can I do it?

[jonathan.lukas]

Hello @CRA ,

this thread may help you:

Call activity parent process instance ID

Hi, I’m using the “camunda-external-task-client-js” node module, my node instance is subscribed to a process instance’s task running on my server and gets a call back to complete that task, aka the handler. Within this process instance’s task, I use a “call activity” to call/invoke another process instance. When that happens, how do I know the child instance, or “call activity” process instances, parent ID? Can I arrange to somehow get the same ID no matter what, even if I am getting a call fr…

Jonathan

[htaylor]

I’ve just done this!

Inside each called process (from the main process), I create an output variable “processInstanceIdProcessName” on a convenient task (or a standalone task for mapping output variables. That makes it easier to know where they are).

The value is set to ${execution.processInstanceId}

Then for each call activity (the activity in the main process), I create an output mapping for that variable (source) outputting to the main process called “processInstanceIdProcessNameMain” (target). You’ll see it pop up as a process variable in the main process.

That way I can tell the processInstanceId for each of the called processes.