In UML models, a signal event
represents a specific message that initiates a transition when an
object receives it.
Before you begin
Before you can add a trigger to
a transition, you must have a state machine diagram open in the
Modeling perspective.
Procedure
- Right-click a transition; then click .
- Complete one of the following steps:
- To create a new signal event, click Create Signal
Event and complete one of the following steps:
- To create a new signal, click Create Signal,
type a name, and press Enter.
- To select an existing signal, click Select Existing
Element, and in the Select Element window,
click an operation, and click OK. Type a name
and press Enter.
- To select an existing signal event, click Select
Existing Element, and in the Select Element window,
click a signal event, and click OK. Type a
name and press Enter.
Results
The signal event is added to the transition in the diagram
and in the
Project Explorer view. You can view
and modify details about the signal event in the
Properties view,
on the Triggers page for the selected transition.