Architectural Styles, Design Patterns, and Objects Joe Paulowskey

Overview  Architectural Designs  Object-Oriented Paradigm  Design Patterns  Architectural Styles

Architectural Designs  Level of Abstraction  Architectural Description  Simple  “Conscience” for a system as it evolves  Limits of the Software

Architectural Descriptions  System Structure  High-Level  Rich Abstractions for interaction  Interactions between components  Rich Components  Global Properties

Architectural Styles  Characterizes a family of systems  Vocabulary of Design Elements  Design Rules  Semantic Interpretation  Analyses

Architectural Styles Benefits  Promotes design reuse  Code reuse  Cognitive Distance  Use of Standardized styles supports interoperability  Specialization

Object-Oriented Design and Software Architecture  Encapsulate data and behavior

Architectural Styles and Object Oriented Design in Architectural Design  Architectural Styles  Describe a broad range of different design families  Object Oriented Design  Components  Architectural Design  Rich Collection of Abstractions

Architectural Styles and Design Patterns  Limitations of traditional Object Oriented  Interaction  Specifying and Packaging  Design Patterns  Repeated in Software Designs

Specifying and Reusing Design Patterns 1. Thoroughly understand design domain 2. Encapsulation 3. Collection of well-known and proven design idioms

Architectural Styles and Design Patterns  Related  View as kinds of patterns  Design language and vocabulary  Set of Idiomatic uses  Styles  Building blocks  Higher Abstraction  Patterns  More Specific

Design Patterns & Architectural Patterns  Apply to Architectural design  Façade, Observer, and Strategy  Don’t Apply  Factory and Flyweight

Questions?