7/31/2023 0 Comments Create sequence diagramShould you nevertheless wish to plot method returns, this can be done with an arrow and a dashed line. In principle, only the method calls are shown in the sequence diagram. This name can be added to the parameters list in parentheses. The method name is placed on this symbol. When an object calls a method of another object, this is symbolized by a continuous arrow which points to the object from which the method was called. If an object calls its own method, the Lifeline thickens again. If an object is involved in a method call, it is active. For objects which are re-created within the program section, the symbol is drawn at the level of the method call in the course of which the object was created. For objects which already exist at the start of the program section, the object symbols are drawn on the upper sheet edge. An object’s lifeline grows in the direction of the lower sheet edge. Objects are shown along the upper sheet edge.Įvery object is on a vertical line - the Lifeline. Classes are not displayed in this diagram. Underlining of the name may be omitted so that no confusion with the class name can occur. Program flow is not always triggered by an object outside of the concerned area, so that in this case no system limit must be set.Īn object is shown by a rectangle containing the name. It usually serves as the start point of the triggering method call. The System Border isolates the concerned part of the program from the rest of the program. The following table contains the sequence diagram symbols. The destruction of an object is represented by a cross on the Lifeline. by calling the method “new”), then the Lifeline of this object begins at this position. If an object is created via the setting of a message (e.g. “arguments” is a comma-separated list of parameter values transferred to the message.The sending of a signal is always as asynchronous character. “name” is the name of the message to be called, or the name of the signal to be sent.The attribute allocation is only used in synchronous messages with return value. “attribute” can be a local variable of the interaction, or an Element of a Lifeline.The message is noted on the message arrow with the following syntax: Repeated message sending is modeled by adding the * symbol, in which case the message has the * symbol placed in front. The Lifeline which belongs to the Element starts first on this place in the diagram e.g., the arrow points to the Lifeline header. A message which creates a new Element is represented by a line and open arrow point.When a message is found the receiver is recognized, but not the sender. Found Messages have an open arrow point.When a message is lost the sender is recognized, but not the receiver. Lost Messages 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.
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