![]() The interaction moves forward irrespective of the receiver processing the previous message or not. Asynchronous Messages – An asynchronous message does not wait for a reply from the receiver.Figure – a sequence diagram using a synchronous message We use a solid arrow head to represent a synchronous message. A large number of calls in object oriented programming are synchronous. The caller continues only when it knows that the receiver has processed the previous message i.e. The sender waits until the receiver has completed the processing of the message. 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.
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