Sequence diagram7/6/2023 ![]() ![]() It is represented by a vertical strip along the object's lifeline. An activity period is the time during which an object performs a direct or indirect action. Messages are mainly sent during an activity, and trigger other activities. the sending of recursive messages is represented by a doubling of the activation band. The message can represent an activation of the objects, a label, be a sequential sending or a parallel sending of n instances of the same message, and can have arguments.Ī return message from results is shown in dotted lines. Messages are often labeled by the name of the operation or signal invoked. A message placed below another will therefore be sent after the first. The vertical dimension represents the passage of time. Objects communicate by exchanging messages represented in the form of arrows. These diagrams are used by software developers and business professionals to understand requirements for a new system or to document an existing process. The destruction of the object is represented by the end of its lifeline. A sequence diagram is a type of interaction diagram because it describes howand in what ordera group of objects works together. To represent an object creation, a message points to the object symbol. They illustrate how the different parts of a system interact with each other to carry out a function, and the order in which the interactions occur when a particular use case is executed. It represents the period of time during which the instantiated object exists. Sequence diagrams, commonly used by developers, model the interactions between objects in a single use case. It is represented by a vertical line below the object. An object is always accompanied by its lifeline. The name is underlined to indicate that it is an instance. The object is made up of its role and / or the name of the instantiated class. The sequence diagram makes it possible to show the objects involved in the interaction description of the interaction and interactions between stakeholders. They are suitable for modeling the dynamic aspects of real-time systems and complex scenarios involving few objects.Īn interaction results in the sending of a message between objects. Sequence diagrams are interaction diagrams like collaboration diagrams. Representation focusing on the sequence of interactions from a temporal point of view.Description of the order of interactions between the objects that make up the system.The sequence diagram is the graphical representation of the interactions between the actors and the system according to an order chronological in the Unified Modeling Language formulation: ![]()
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