Activity, Collaboration, and Component Diagrams Philip Liew

Activity Diagrams Represent the business and operational workflow of a system Shows activity, and event that causes object to be in particular state

Symbols Starting point –First activity of the flow Activity Decisions

Symbols Signals (input and output) Concurrent activity Final activity

Activity Example

Sequence Diagrams Depicts a sequence of actions that occur in a system Captures invoked methods of objects, and order of invocation Represents dynamic behaviour of system

Sequence Symbols Object is an instance of a class Name to the left of “:” is object name Name to the right of “:” is class name Arrows represent messages –Simple messages –Special message creating object –Special message destroying object –Message response

Sequence Diagram Horizontal object shows life of represented object Vertical axis represents sequence of invocation of object

Sequence Diagram Skeleton

Collaboration Diagram Sequence diagram is time ordered Like activity diagrams but shows association with other objects in the system

Elements Object Relation/Association Message –Number represents order of interaction

Component Diagram Represents Implementation perspective Reflect grouping of different design elements of system

Component Elements Component –Interacting objects within system Class/Interface/Object Relation/Association

Component Diagram Example

Deployment Diagram Represents physical relationships among software and hardware components as realized in running system Nodes represent computational elements (i.e. processor, server, etc.)

Deployment Diagram Skeleton

Example

Courseware Example Construct the design elements for a system that can be used to manage courses/classes The organization offers a courses in areas such as learning management techniques and understanding different software languages and technologies Each course consists of a set of topics Tutors assigned courses to teach according to their specialty and availability Publishes and maintains calendar of courses and assigned tutors Course Administrators who manage content, assign courses to tutors, and define schedule

Identify Actors Tutors Course Administrators Students Course Administrator is main actor

Use Case Manage courses –View courses –Manage topics for a course –Manage course information Manage course assignments –View course calendar –View tutors –Manage tutor information –Assign courses to tutors

Use Case

Class Diagram

Activity Diagram

Sequence Diagram

Collaboration Diagram

Component Diagram