Question & Answer
Question
What is the difference between Message, Event, Reception or Signal in IBM Engineering Systems Design Rhapsody?
Answer
Messages are used to trigger operations or represent interactions between objects. Events are abstract entities used to trigger transitions in statecharts and facilitate asynchronous collaborations. Signals are a specific type of event that can be broadcast to multiple listeners. Receptions are a mechanism that allows a class to react to an event.
Messages:
- Represent interactions between objects or between an object and the environment.
- Can be events, triggered operations, or primitive operations.
- Used to invoke operations on objects or to trigger actions.
- Can be synchronous or asynchronous.
Events:
- Abstract entities in Rhapsody, not directly represented in programming languages like C++.
- Used to trigger transitions in statecharts and facilitate asynchronous communication.
- Inherit from the OMEvent abstract class.
- Can be triggered by messages or other events.
Signals:
- A specific type of event, often used for broadcasting information to multiple recipients.
- In BPMN, signals are global and can trigger all active signal event handlers.
- Can be used to start new process instances or trigger actions within existing ones.
- Signals represent a publish-subscribe communication pattern, while messages represent point-to-point communication.
Receptions:
- Used to define how a class handles incoming events.
- Name of a reception is typically the same as the event it handles.
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Document Information
Modified date:
21 August 2025
UID
ibm17241425