Contents
What should be the order of objects in the sequence diagram?
A sequence diagram simply depicts interaction between objects in a sequential order i.e. the order in which these interactions take place. We can also use the terms event diagrams or event scenarios to refer to a sequence diagram. Sequence diagrams describe how and in what order the objects in a system function.
How do you think a return value should be modeled in a sequence diagram?
In Sequence Diagrams, The returned object type is indicated by an identifier in the text in each box, such as “user: User” or “:UserDAO”.
How do you show return value in sequence diagram?
To show the return value of a function as a reply message in an animated sequence diagram, you can use one of a number of predefined macros within the code of your function. This means that the return value for your function visually displays as a reply message on your sequence diagram.
What is return message in sequence diagram?
Besides just showing message calls on the sequence diagram, the Figure 4 diagram includes return messages. These return messages are optional; a return message is drawn as a dotted line with an open arrowhead back to the originating lifeline, and above this dotted line you place the return value from the operation.
What is critical sequence diagram?
A sequence fragment is represented as a box called a combined fragment, which encloses a portion of the interactions within a sequence diagram….Sequence Fragments.
| Operator | Meaning |
|---|---|
| critical | Critical region: the fragment can have only one thread executing it at once. |
What is a sequence diagram used for?
A sequence diagram shows the sequence of messages passed between objects. Sequence diagrams can also show the control structures between objects. For example, lifelines in a sequence diagram for a banking scenario can represent a customer, bank teller, or bank manager.
How to return a value in sequence diagram?
I want to know how to return a value in a sequence diagram, for example: Here are two variants. Please, notice, that dashed line means returning message. Solid line with parameters – calling message. Full triangle arrow head means synchronous call. Line angle triangle arrow head means asychronous call.
When do you use a rectangle in a sequence diagram?
It is used to indicate that an object is active (or instantiated) during an interaction between two objects. The length of the rectangle indicates the duration of the objects staying active. In a sequence diagram, an interaction between two objects occurs when one object sends a message to another.
How is a lifeline represented in a sequence diagram?
A lifeline is represented by dashed vertical line drawn below each object. These indicate the existence of the object. Object names can be specific (e.g., myAccount) or they can be general (e.g., myAccount :Account). Often, an anonymous object (:Account) may be used to represent any object in the class.
How are entities represented in a sequence diagram?
Entities of participants in a collaboration (scenario) are written horizontally across the top of the diagram. A lifeline is represented by dashed vertical line drawn below each object. These indicate the existence of the object. Object names can be specific (e.g., myAccount) or they can be general (e.g., myAccount :Account).