Message versus signal to call a method in a digram sequence

Question

I am studying a UML sequence diagram and I came across a method call, so I noticed that there are two ways to make a call to a behavior method in Unified Modeling Language (UML), which is a signal and a message, but I don’t know, I know how indicate which one and on the basis of what? I mean, when to use the message and when to use the signal, because I consider this a very important design decision and should be well chosen?

Answer 1

Actually it is, but I think that the terminology you use is not very accurate (message and signal). All kind of communication between two objects in a sequence diagram is considered a message .

However, there are two main types of messages: synchronous and asynchronous .

A normal method call, when the invoke method call is blocked until the method completes, is a synchronous call, a synchronous message. Invoker will receive the return value from the called method and continue its own execution. As a result, there is only one thread of execution.

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Answer 2

http://www.uml-diagrams.org/sequence-diagrams.html

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