UML Diagrams Sequence Diagram Sequence diagrams The Sequence

Sequence diagrams � The Sequence Diagram models the collaboration of objects based on a

Sequence diagrams elements Actor 2. Object 3. Life. Line 4. Messages 1.

1. Actors � An actor is a person, organization, or external system that plays

2. Object �a box shape represents a class, or object, in UML. � It

3. Life. Line A dashed vertical line that represents the passage of time as

4. Messages (1) � packets of information that are transmitted between objects. � They

4. Messages (2) � Synchronous messages � represented by a solid line with a

4. Messages (3) � Asynchronous messages � represented by a solid line with a

4. Messages (4) � Asynchronous return messages � represented by a dashed line with

4. Messages (5) � Create messages � represented by a dashed line with a

4. Messages (6) � Reply messages � represented by a dashed line with a

4. Messages (7) � Delete messages � represented by a solid line with a

Slides: 19

Download presentation

UML Diagrams Sequence Diagram

Sequence diagrams � The Sequence Diagram models the collaboration of objects based on a time sequence. � It shows how the objects interact with others in a particular scenario of a use case.

Sequence diagrams elements Actor 2. Object 3. Life. Line 4. Messages 1.

1. Actors � An actor is a person, organization, or external system that plays a role in one or more interactions with your system. � Actors are drawn as stick figures.

2. Object �a box shape represents a class, or object, in UML. � It demonstrate how an object will behave in the context of the system. � Class attributes should not be listed in this shape.

3. Life. Line A dashed vertical line that represents the passage of time as it extends downward. � Along with time, they represent the sequential events that occur to an object during the charted process. � Lifelines may begin with a labeled rectangle shape or an actor symbol. �

4. Messages (1) � packets of information that are transmitted between objects. � They may reflect the start and execution of an operation, or the sending and reception of a signal.

4. Messages (2) � Synchronous messages � represented by a solid line with a solid arrowhead. � This symbol is used when a sender must wait for a response to a message before it continues.

4. Messages (3) � Asynchronous messages � represented by a solid line with a lined arrowhead. � Asynchronous messages are those that don't require a response before the sender continues.

4. Messages (4) � Asynchronous return messages � represented by a dashed line with a lined arrowhead.

4. Messages (5) � Create messages � represented by a dashed line with a lined arrowhead. � These messages are sent to lifelines in order to create objects.

4. Messages (6) � Reply messages � represented by a dashed line with a lined arrowhead. � these messages are replies to calls.

4. Messages (7) � Delete messages � represented by a solid line with a solid arrowhead, followed by an X symbol. � This messages indicates the destruction of an object and is placed in its path on the lifeline.

Examples