Domain Inheritance Scaling Agility using Domain Inheritance

Overview Concept Idioms Demo

Concept Some context The (meta-) model

Some Context Aspect Orientation Subject Orientation Component Based Development Service Oriented Architecture

Subject Oriented Programming

Aspect Oriented Programming

Component Based Development

Domain Driven Design

Service Oriented Architecture

Concept State – Add Object Types – Add Relation Types – Add Inheritance relationships – Add Namespaces Behavior – Domain overrides (public/private domain methods)

The (meta) model

Idioms 3 rd Generation OO Modeling Multiple Type Declarations Raw, Cooked or Half Baked Objects (Against Design by Contract) Naked Objects and UI Abstract Factory

3 rd Generation Object Oriented Programming (OOP) Can be seen as a evolution from – 1 st Generation OOP (Inheritance) – 2 nd Generation OOP (Delegation)

1 st Generation OOP

2 nd Generation OOP

3 rd Generation OO

Multiple Type Declarations

Muldecs – Implementation in Allors

Design By Contract (is evil) Class invariants using Pre- and Post conditions

Half Baked Objects

Naked Objects

UI Abstract Factory

Questions?