Description

Introduce a new CLAIMING event and corresponding CLAIMING lifecycle state in addition to the existing ASSIGNING state. This addition will help to clearly distinguish between ASSIGN and CLAIM commands during user task processing in a scenarios such as:

• Determining the correct processor to finalize the command after the execution of assignment listeners.
• Identifying which command (ASSIGN or CLAIM) should be re-executed after resolving an incident caused by a failure during assignment task listener properties evaluation.

Key deliverables

1. Add CLAIMING event and CLAIMING lifecycle state:

   • Create a UserTaskClaimingApplier to handle the transition to the CLAIMING lifecycle state.
   • The records stream for claim operations will follow this structure:

     C CLAIM
     E CLAIMING -> Applied by new `UserTaskClaimingApplier`, setting the `CLAIMING` lifecycle state for the user task.
     E ASSIGNED
     

2. Ensure backward compatibility by maintaining existing ASSIGNED events after the CLAIMING state.

3. Testing:

   • Add unit and integration tests to verify:
     • The correct UserTask procession after claim operations.
     • Backward compatibility with the existing behavior.

4. Evaluate the effort required to add CLAIMED event:

   • The introduction of CLAIMED event will provide a more complete and intuitive records stream:

     C CLAIM
     E CLAIMING
     E CLAIMED
     

   • Assess the level of effort required to support the CLAIMED event by other components like the Tasklist, Operate, Optimize application.

Acceptance criteria

• The CLAIMING intent and CLAIMING lifecycle state are introduced.
• Update UserTaskClaimProcessor to write CLAIMING event upon processing CLAIM command.
• Introduce UserTaskClaimingApplier that will handle user task CLAIMING event
• The implementation does not introduce breaking changes.
• Tests are updated to validate the new behavior.
• Evaluate the effort required to add CLAIMED intent.

Blocks:

• Improve Tasklist UX when listener blocks operation #25421