Activities of Keypad

Gallery
Tutorial
HOWTO: Send and receive a Signal via Ports in SysML and Cameo Simulation Toolkit
Section
Topic level
BASIC
UML keywords
Port
Activity
InvocationAction::onPort
CallBehaviorAction
ReadSelfAction
SendSignalAction::target
Keywords
Slide kind
hybrid diagram
SysML Activity Diagram
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The top-level Keypad activity simply loops over invocations of CatchN, which will handle receipt of our keypad Signals N0, N1 etc.

The activity SendDigitViaPort sends a digit via the port o:~I_Keypad (note that InvocationAction::onPort is set).

And the SendSignalAction::target is ... the keypad!

UML/SysML: When sending a Signal (message) via a Port the 'target' is the owner of the Port through which the message will be sent, it is NOT the final recipient! So the 'target' is essentially the "sender"!

The spec is a bit confusing here. When you send without a Port you are in fact sending directly to the "remote" 'target', and then this makes sense:

UML-2.5.1: 'SendSignalAction::target: The InputPin that provides the target object to which the Signal instance is sent'

But when you are sending through a Port, there is no locally-known remote 'target', all that is known is the owner of the Port, where the owner of the Port is essentially the "sender"!

Up next
Activity of Receiver
Notes
[COMPLICATION]{INFORMATIVE} UML/SysML: When sending a Signal (message) via a Port the 'target' is the owner of the Port through which the message will be sent, it is NOT the final recipient! So the 'target' is essentially the "sender"!
Snippets (quotes/extracts)
  [UML-2.5.1] InvocationAction::onPort : Port [0..1] For CallOperationActions, SendSignalActions, and SendObjectActions, an optional Port of the target object through which the invocation request is sent.
  [UML-2.5.1] SendSignalAction::target: The InputPin that provides the target object to which the Signal instance is sent
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Related slides (backlinks, includes other tutorials)