Activity Diagrams-Object-Oriented Design-Lecture 11 Slides-Computer Engineering, Slides of Object Oriented Analysis and Design

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Department of Computer Engineering

Sharif University of Technology

Object-Oriented Design

Lecturer: Raman Ramsin

Lecture 11 :

Activity Diagrams – Part 1

Department of Computer Engineering

Sharif University of Technology

Analysis Workflow: Analyze a Use Case  The analysis workflow consists of the following activities:  Architectural analysis  Analyze a use case  Outputs:  analysis classes  use case realizations  Analyze a class  Analyze a package

Department of Computer Engineering

Sharif University of Technology

Activities  Activities are networks of nodes connected by edges.  Categories of nodes:  action nodes - atomic units of work within the activity;  control nodes - control the flow through the activity;  object nodes - represent objects used in the activity.  Categories of edges:  control flows - represent the flow of control though the activity;  object flows - represent the flow of objects through the activity.  Activities can have preconditions and postconditions.

Department of Computer Engineering

Sharif University of Technology

Activities: Example

Department of Computer Engineering

Sharif University of Technology

Activities: Tokens  Tokens flow around the network and can represent:  the flow of control;  an object;  some data.  Tokens move from a source node to a target node across an edge depending on:  source node postconditions;  edge guard conditions;  target preconditions.

Department of Computer Engineering

Sharif University of Technology

Activity Partitions  Activity partitions - a high-level grouping of related actions.  Partitions form a hierarchy rooted in a dimension.

Department of Computer Engineering

Sharif University of Technology

Action Nodes: Types

Department of Computer Engineering

Sharif University of Technology

Action Nodes: Call  Call action node:  call an activity - use the rake symbol;  call a behavior;  call an operation.

Department of Computer Engineering

Sharif University of Technology

Control Nodes

Department of Computer Engineering

Sharif University of Technology

Control Nodes: Decision and Merge

Department of Computer Engineering

Sharif University of Technology

Object Nodes  Object nodes represent instances of a classifier.  Input and output edges are object flows - represent the movement of objects.  Object node output edges compete for each output token.

Department of Computer Engineering

Sharif University of Technology

Object Nodes: Buffer Semantics  Object nodes act as buffers:  {upperBound= n};  {ordering= FIFO} XOR {ordering= LIFO};  {ordering= FIFO} is the default;  may have a «selection».  Object nodes can represent objects in a particular state.

Department of Computer Engineering

Sharif University of Technology

Pins  A Pin is an object node that represents one input to or output from an action or activity.

Department of Computer Engineering

Sharif University of Technology

Reference  Arlow, J., Neustadt, I., UML 2 and the Unified Process: Practical Object-Oriented Analysis and Design, 2

nd

Ed. Addison-Wesley,