![]() ![]() Lost Message - The receiver of the message is unknown.Ī lost message is represented by adding a small solid circle at the receiver side of the line.Ī Message Notation may have a label to provide message name and arguments.Īn order may support 2 message calls: A synchronous message call of GetOrder(id)Īnd an asynchronous call of CancelOrder(id).Found Message - The sender of the message is unknown.Ī found message is represented by adding a small solid circle at the sender side of the line.If the sender or receiver is unknown or simply outside of the scope of the diagram, a small solid circle Synchronous Response is represented by a dash line with a line arrow.Ī Message Notation should be draw from the lifeline of the sender to the lifeline of the receiver. Asynchronous calls are present in multithreaded applications and in message-oriented middleware. Synchronous Response Message - The sender of the message is responding to a synchronous message it received earlier.Synchronous Request Message - The sender of the message is waiting for a return message.Ī synchronous request message is represented by a solid line with a solid arrow.Asynchronous Message - The sender of the message is not waiting for any return messages.Īn asynchronous message is represented by a solid line with a line arrow. ![]() The style of the line and arrow have 3 variations depending on whether or not the message is synchronous message: A Message Notation represents a particular communication between objects participating a communication interchange.Ī Message Notation is a graphical notation used in a UML Sequence Diagram to representĪ particular communication between objects participating a communication interchange.Ī Message Notation is drawn as a straight line with an arrow pointing to the lifeline which receives the message. Asynchronous messages are sent from an object that will not wait for a response from the receiver. This section describes the Message Notation used in a UML Sequence Diagram. Learn about sequence diagram notations and messages. UML Tutorials - Herong's Tutorial Examples ![]()
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