How are synchronous and asynchronous messages differentiated in a sequence diagram?a.By the presence or absence of a return arrowb.By the position of the message namec.By the use of different message stereotypesd.By the use of different colors for message arrows
Question
How are synchronous and asynchronous messages differentiated in a sequence diagram?a.By the presence or absence of a return arrowb.By the position of the message namec.By the use of different message stereotypesd.By the use of different colors for message arrows
Solution
Synchronous and asynchronous messages in a sequence diagram are differentiated by the presence or absence of a return arrow.
In a sequence diagram, a synchronous message requires a response before the interaction can continue. It is represented by a solid line with a filled arrowhead pointing towards the lifeline of the receiver. After the receiver has finished processing the message, it sends a response back to the sender, which is represented by a dashed line with an open arrowhead pointing towards the lifeline of the sender.
On the other hand, an asynchronous message does not require an immediate response and the interaction can continue without waiting for the receiver to finish processing the message. It is represented by a solid line with an open arrowhead pointing towards the lifeline of the receiver. There is no return arrow for an asynchronous message because the sender does not wait for a response.
The position of the message name, the use of different message stereotypes, and the use of different colors for message arrows do not differentiate between synchronous and asynchronous messages in a sequence diagram.
Similar Questions
In a sequence diagram, what does a synchronous message indicate?a.The sender must wait for a response before continuing its executionb.The message is broadcasted to multiple objects simultaneouslyc.The message is exchanged between objects of the same classd.The sender can proceed with its execution before receiving a response
A dashed arrow in a sequence diagram represents a synchronous message, indicating that the sender can proceed with its execution before receiving a response.True or False?Select one:TrueFalse
What is the purpose of a return message in a sequence diagram?a.To represent a loop or conditional behaviorb.To indicate the completion of a method call and the return of control to the callerc.To define the attributes of an objectd.To show the order of messages exchanged between objects
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What does a message mean? Select one: It Passes all communications from one object to another and are represented by message arrows in sequence diagrams Message goes from the sending object’s lifeline to the receiving object’s lifeline It is a rectangle containing an identifier with a dashed line extending below the rectangle All of the mentioned
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