Hook: Define a Transition

Requirement

A new transition must be defined as part of a process.

Method of Adaptation

Enable Feature

Level of Support

Parameter Pattern

HotSpot

Processes

Hooks used

Define a Gate , Select a Transition that changes to a special process gate , Create a transition that just changes to a gate

Participants

Transition, NewTransition , newTransition

Changes

1. choose: Transition needs to perform some action or just needs to go to some gate?
2. if transition needs to perform some action:
1. implement NewTransition of Transition.
2. NewTransition.perform implements Transition.perform .
3. NewTransition.perform performs some action making up the transition (e.g. calculate prices, change catalogs/stocks, etc.).
4. NewTransition.perform returns Define a Gate [newGate].
5. instance newTransition of NewTransition.
3. if transition just needs to go to some gate:
1. choose: Destination gate one of rollback-, commit-, stop-, quit- or log gate of the process the transition will belong to?
2. if so:
1. newTransition = Select a Transition that changes to a special process gate [transition].
3. if not so:
1. newTransition = Create a transition that just changes to a gate [newTransition].

Constraints

• This hook is usually invoked in the context of Define a new process only.

Comments

• Actions in transition must be short and should comprise activities that change the actual state of the application ('s data). Transitions are guaranteed not to be interrupted.