"Object-Oriented Design: Activity Diagrams, Exception Handling, Signals", 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 12 :

Activity Diagrams – Part 2

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

Interruptible Activity Regions  interrupted when a token traverses an interrupting edge.  all flows in the region are aborted when it is interrupted.  interrupting edges are drawn as a zigzag arrow or as a normal arrow with a zigzag icon above it.

Department of Computer Engineering

Sharif University of Technology

Exception Handling  Exception pins:  output an exception object from an action;  are indicated with an equilateral triangle.  Protected nodes:  have an interrupting edge leading to an exception handler;  abort when an exception of the right type is raised, and flow passes to the exception handler node.

Department of Computer Engineering

Sharif University of Technology

Expansion Nodes: Example

Department of Computer Engineering

Sharif University of Technology

Sending Signals and Accepting Events  Signals:  information that is passed asynchronously between objects;  class stereotyped «signal»;  the information is held in the attributes.

Department of Computer Engineering

Sharif University of Technology

Sending Signals and Accepting Events: Examples

Department of Computer Engineering

Sharif University of Technology

Streaming

Department of Computer Engineering

Sharif University of Technology

Input and Output Effects

Department of Computer Engineering

Sharif University of Technology

Multicast and Multireceive  Multicast sends an object to many receivers:  stereotype the object flow «multicast».  Multireceive receives objects from many senders:  stereotype the object flow «multireceive».

Department of Computer Engineering

Sharif University of Technology

Central Buffer Nodes  Central buffer node - object nodes that are used specifically as buffers:  stereotype the object node «centralBuffer».

Department of Computer Engineering

Sharif University of Technology

Interaction Overview Diagrams  Interaction overview diagrams show flow between interactions and interaction occurrences