If sequence diagram4/6/2023 ![]() Synchronous messages – A synchronous message waits for a reply before the interaction can move forward.Messages can be broadly classified into the following categories : Figure – a sequence diagram with different types of messages Lifelines and messages form the core of a sequence diagram. The messages appear in a sequential order on the lifeline. Messages – Communication between objects is depicted using messages.The following is an example of a sequence diagram: Figure – a sequence diagram Difference between a lifeline and an actor – A lifeline always portrays an object internal to the system whereas actors are used to depict objects external to the system. ![]() If we want to model an unnamed instance, we follow the same pattern except now the portion of lifeline’s name is left blank. The head is located on top of a vertical dashed line (referred to as the stem) as shown above. The standard in UML for naming a lifeline follows the following format – Instance Name : Class Name Figure – lifelineWe display a lifeline in a rectangle called head with its name and type. Lifeline elements are located at the top in a sequence diagram. So basically each instance in a sequence diagram is represented by a lifeline.
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