The fragment in the sequence diagram are rectangular frames drawn over a portion of the diagram. Various predefined fragment types are available, allowing you to specify alternate results, parallel messages, or loops. Interactive fragments allow you to group related messages in a sequence diagram. The fragment operator (in the upper left corner) indicates the type of the fragment. Combination fragmentsĪ sequence fragment is represented as a box called a combined fragment, which encloses a part of the interaction in the sequence graph. To indicate that it takes a certain while before the receiver actually receives a message, a slanted arrow is used. The messages are drawn as a horizontal arrow. Messages are often considered to be instantaneous, thus, the time it takes to arrive at the receiver is negligible. Only when a target’s destruction is set to ‘after destructor’ do you have to use a destructor. There are other ways to indicate that a target is destroyed during an interaction. Targets that are created during the interaction by a constructor call are automatically placed further down the diagram.Ī destructor message destroys its receiver. The sender that already exist at the start of the interaction are placed at the top of the diagram. Participants can be created and destroyed according to the messages that are being passed.Ī constructor message creates its receiver. Participants do not necessarily live for the entire duration of a sequence diagram’s interaction. Return message indicates a return from a procedure call.The receiver and sender of an asynchronous message are working concurrently. The sender of a message passes the signal to the receiver of the message via the message and then continues its activity without waiting for the receiver to return the message or control.The sender of a message passes control to the receiver of the message, then stops the activity and waits for the receiver of the message to give up or return control which is used to indicate synchronization.Messages are generally classified as Synchronous Message, Asynchronous Message, and Return Message.The top and the bottom of the rectangle are aligned with the initiation and the completion time respectively. It represents the period during which an element is performing an operation. It can be interpreted as a pair of brackets in C semantics represented by a small rectangle. Focus of Control (also known as the activation period) is the symbol for the time period during which the object will perform the corresponding operation.Place the object that initializes the whole interaction activity at the leftmost end.Ī dashed line extending down from the object icon in the timing diagram, indicating how long the object has existed.The left and right order of the objects is not important, but in order to make a clear and neat diagram, the following two principles should be followed: put the objects with frequent interactions as close together as possible.Shows only the object name but not the class name, e.g.: lecturer in the timing diagram, it is represented by “object”.Īll three naming methods are available, which is the easiest for people who read the chronological chart to understand, choose which one.Shows only the class name, that is, it is an anonymous object, for example: :course in the timing diagram, with “:class”.Includes the object name and class name, for example: live class: class, in the time series diagram, with “object: class”.Object – There are three ways of naming objects: Actor – System actors, which can be people, machines, other systems, subsystems used to represent in the temporal sequence diagram.Ģ. It can visually describe the process of concurrency.ġ.Compared with other UML diagrams, a temporal sequence diagram places more emphasis on the chronological order of interaction behavior.Model the interaction behavior as message passing, and show the interaction between objects dynamically by describing how messages are sent and received between them. Show the order of interactions between objects.The three ways of naming an object are shown in Figure below.Įdit this Sequence Diagram The Objects of Sequence Diagram An object can be named in one of three ways: the object name, the object name and its class, or just the class name (anonymous object). In the UML, an object in a sequence diagram is drawn as a rectangle containing the name of the object, underlined. It shows the dynamic collaboration between multiple objects by describing the temporal order in which messages are sent between them. A sequence diagram, also known as a sequence diagram, sequential diagram or sequential diagram, is a UML interaction diagram.
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