![]() When a message is found the receiver is recognized, but not the sender. Found Message s have an open arrow point.When a message is lost the sender is recognized, but not the receiver. Lost Message s have an open arrow point in the direction of a filled circle.There is accordingly no answer arrow to asynchronous calls. Asynchronous means that the caller does not wait, but rather proceeds immediately after the call. Asynchronous Messages have an open arrow point.The Reply Message to a synchronous call is represented by a dashed line and open arrow point. Synchronous means that the caller waits until the called behavior has ended. Synchronous Message s are represented by filled arrowheads.In the following illustration, the various message types and corresponding notation forms are shown. UML recognizes various types of messages which are demonstrated using various kinds of arrow notation. Labeling of messages is carried out using the names of the corresponding operations. The transfer of a message is noted using arrows. Put more simply, the sending and receiving of messages determines the start and end of the ExecutionOccurence. Start and End of ExecutionOccurence are defined via the so-called Event Occurrence. These rectangles represent the so-called ExecutionOccurence. This is shown by the elongated rectangle on the Lifeline. ![]() When messages are exchanged between Lifelines, a Behavior must also be implemented in the associated elements. In the heading of the Lifeline is the (optional) element name with the associated class in the usual declaration notation: name : type. It is important that the entire diagram represents an interaction, and that an interaction is not only a single message exchange.įig. The sequence diagram in the following illustration shows an interaction among three objects. The chronological progress of messages is thereby highlighted. Messages are shown using arrows between the Lifelines. The participating objects are represented by a rectangle and a dashed vertical line. When an object is created, and when and to what object information is sent, are all determined here. ![]() The messaging sequence corresponds to its horizontal position in the diagram. A Sequence Diagram is primarily concerned with the chronological progression of messages. ![]()
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