Object Oriented Software techniques

Software Architecture :

Why Distributed Object Oriented Programming ?

2 © Emmanuel FUCHS.© Emmanuel FUCHS. THALES ATM

Distributed Object Programming

� Raising abstraction

� Object Programming

� Programming for changes

� Programming in future tense

� Programming for reuse

� Programming by interface

� Letting old code calling new code

� Polymorphism and dynamic binding

4 © Emmanuel FUCHS.

Raise abstraction means:

� Encapsulation

� Layering

� Interface

� Object Programming techniques


Middleware

Middleware

Network

Hardware

Network

Hardware

Operating System Operating System

Application ApplicationInterface


Middleware

Middleware

Network

Hardware

Network

Hardware

Operating System Operating System

Application Application

Object API Object API

Framework


Middleware

� Low level middleware:

� Message Passing : spaghetti plate syndrome

� RPC : no evolution

� Object middleware:

� Transparent integration

� Transparent reuse


Object figures

� Encapsulation.

� Interfaces.

� Inheritance.

� Polymorphism. (dynamic binding)

� Exception handling.


program in the future tense.

1 Day After

1 Week After

Initial Request

Future tenseprogramming


program in the future tense.

1 Day After

1 Week After

Few Weeks Later

1 Day After

Initial Request Evolution Request


Changes Sources During Development

� Requirements :

� Customers Discover What they Really Want During or at the End of Developments

� Technology

� Performances Are Increasing With Time

� Skill

� We Learn and Understand the Problem and We Discover the Right Solution on the Job

� Politic

� No Comments


Programming in “present” tense

x

y


Programming in “present” tense

Point

+print()

# int x# int y

ClientPrint()

x

y


Future

Point

+print()

# int x# int y

ClientPrint()

x

yz


Programming in “Future” tense

Point

+print()

# int x# int y

3DPoint

+ print()

# int z

ClientPrint()

x

yz



Point

+print()

# int x# int y

3DPoint

+ print()

# int z

ClientPrint()

x

y

θθθθ

ρρρρz



<<Interface>>Point

+print()

3DPoint

+ print()

ClientPrint()

x

y

θθθθ

ρρρρz


Inheritance and polymorphism

Point

+print()

1DPoint

+ print()

ClientPrint()



Point

+print()

1DPoint

+ print()

ClientPrint()

2DPoint

+ print()



Point

+print()

1DPoint

+ print()

ClientPrint()

2DPoint

+ print()

3DPoint

+ print()



Point

+print()

1DPoint

+ print()

ClientPrint()

2DPoint

+ print()

3DPoint

+ print()

NDPoint

+ print()

Teleportation



<<Interface>>Point

+print()

1DPoint

+ print()

ClientPrint()

2DPoint

+ print()

3DPoint

+ print()

NDPoint

+ print()

Teleportation


Objective-C analogy

Class Object


Implementation Interface

A driver doesn't care of engine's internal working.He only knows the interface

Object Car analogy



Object analogy



Interfacevehicle {

attributes engine

interface car {

start()accelerate()stop()

}}

car start()


Inheritance


Polymorphism

Accelerate


Interface VS implementation inheritance

Implementation

(body)

Interface

(specification)


Interface VS implementation inheritance

Accelerate

Accelerate



Point

+print()

1DPoint

+ print()

ClientPrint()

2DPoint

+ print()

3DPoint

+ print()

NDPoint

+ print()

Teleportation



<<Interface>>Point

+print()

1DPoint

+ print()

ClientPrint()

2DPoint

+ print()

3DPoint

+ print()

NDPoint

+ print()

Teleportation


Change management before OO

Current Code Current Code



New Code Old Code



New Code Old Code

Old Code New Code


Change management and code reuse before OO

New Code Old Code

Old Code New Code

Modify Old Code


Change management with OO reuse


Old Code New Code

Add new Code without Modifying Old Code


Change management with OO reuse


Old Code New Code

Add new Code without Modifying Old Code

Framework

Object Oriented Software techniques

Technology

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