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Signal

An example of a UML Signal elemen using Sparx Systems Enterprise Architect.

Description

A Signal is a specification of Send request instances communicated between objects, typically in a Class or Package diagram. The receiving object handles the Received request instances as specified by its Receptions. The data carried by a Send request is represented as attributes of the Signal. A Signal is defined independently of the classifiers handling the signal occurrence.

A Reception is defined as a feature of the receiving object, derived from the Signal element. The Reception takes the name of the Signal, and the Signal's attributes as its parameters.

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Signal element

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OMG UML Specification:

The OMG Unified Modeling Language specification, (v2.5.1, p.178) states:

A Signal is a specification of a kind of communication between objects in which a reaction is asynchronously triggered in the receiver without a reply.

The OMG Unified Modeling Language specification, (v2.5.1, p.178) also states:

A Reception is a declaration stating that a Classifier is prepared to react to the receipt of a Signal.