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OIC: How to Find Human Task by Correlation and How to Abort a Parallel Task by Jan Kettenis

Blog: PaaS Community

This article explains how you can find an instance of a Human Task of process instance in the Oracle Integration Cloud (OIC) without knowing its task number, and how you can use that for example to withdraw a parallel task. You can use the same mechanism for other use cases as well, like to get a specific task instance for a specific process instance in a custom Workspace, etc.

When a Human Task is scheduled in a process there is no out-of-the-box way for the process instance to “know” its task number, because scheduling a task concerns an asynchronous call (so you don’t get an immediate response with the task number). So, although the task number is visible in the process flow trace (as shown below), the process instance itself does not know it.

The sample process below has two parallel tasks. The outcome of Parallel Task 2 is either CONTINUE or DONE. When DONE, Parallel Task 1 must be withdrawn. I will use this as a use case to illustrate how setting some “correlation id” on a task can be used to achieve that.

For those of you who remember the on-premise BPM Suite may be aware of the Update Task activity you could use to do just that, but such an activity does not exist in OIC. Instead you will have to use the PUT operation of the /ic/api/process/v1/tasks/{id} API. But as you can see this requires an id, which is the task number that you don’t have. To get that you can use the GET operation on /ic/api/process/v1/tasks first. However, there can be many instances of the same process, implying many instances of the Parallel Task 1, so how to find that one you are looking for? Read the complete article here.

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