Work Product (Artifact): Signal








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Work Product (Artifact): Signal















This work product specifies an asynchronous stimulus from one object or instance to another.






Purpose



The purpose of a signal is to provide one-way asynchronous communication from one object or instance to another. Signals are a specialization of Artifact: Event that can have operations, attributes, and relationships.



Relationships



Container Artifact


Design Model





RolesResponsible:



Software Architect


Modified By:




Properties



Optional


Planned



Tailoring



Representation OptionsUML Representation: Signal. Also commonly represented as a class stereotyped <<signal>>.  Signals are used to define entities for asynchronous messaging. They are suitable for communication in distributed and concurrent systems. Avoid naming signals in a 'receiver-specific' manner - this limits their generality and usefulness, bearing in mind that signals may be broadcasted to a set of objects. The important thing is to communicate the interesting occurrence the sender has detected (which prompted it to send the signal). A signal may also have a list of parameters which are represented as its attributes. Operations may be provided on a signal to access these attributes. Since Signals are a specialization of Work product: Event, signal tailoring is dependent on the tailoring for Work product: Event. For example, the Work product: Event information can be captured in textual form (such as a table in the Software Architecture Document), while the Signal-specific properties are captured in a visual model.



More Information



Checklists


Signal





Concepts


Events and Signals








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