Presentation Abstraction Control

Presentation-Abstraction-ControlIn Software Architecture Design

ThanhDT00730SE0303

Preface

Presentation – Abstraction – Controller (PAC) is similar to MVC

Model – View – Control (MVC)

Model Control

…but with some differences

Presentation – Abstraction – Controller (PAC)

Model Control

Presentation

Abstraction Controller

Model – View – Control (MVC)

Presentation

Abstraction ControllerPresentation

Presentation

Top-level agent

Middle-level agents

Bottom-level agents

Applicable domain

• Loosely coupling cooperating agents in a hierarchical system

Example

Air traffic control

Example

Benefits

• Support of multi-tasking and multi-viewing.• Support agent reusability and extensibility.• Easy to plug-in new agent or replace an

existing one.• Support for concurrency where multiple

agents are running in parallel in different threads or different devices or computers.

Limitations

• Extra time lost due to the control bridge between presentation and abstraction and the communication between agents

• Difficult to determine the correct number of the agents due to the loose coupling

• Development complexity

Thank you for listening

Presentation Abstraction Control

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Transcript of Presentation Abstraction Control

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