BIS08 Application Development - II

Business Information Systems Application Development -II Object Oriented Techniques System Development Life Cycle Prithwis Mukerjee, Ph.D.

What shall we cover here ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Data Modelling >> Object Orientation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Rigidity >> Flexibility ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Examples of Classes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],INHERITANCE is the phenomenon by which one CLASS inherits ATTRIBUTES from another classes

More Classes ... ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Methods + Attributes = Classes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Each Class has own Attributes / Methods ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],POLYMORPHOSIM is the phenomenon by which the same METHOD could mean different things in different CLASSes

Object Oriented Techniques ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

OO Application Development ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],A large and complex application that manages the internals of a big company can have hundreds of classes, each with its own attributes and methods. Managing all this is not easy !! We need to define a process for doing all this ...

OO Application Development ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

A potential violation ? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Persistence ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Making OBJECTs persist ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The Next Day ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Three Tier Architecture Application in Execution Application Not Executing Relational Database Non Relational Database OR transient objects in application persistent objects in database Commercial, “business” applications RARELY use NON RELATIONAL database CLASS definition O2 O3 O4 O1 CLASS definition User Interface

System Development Life Cycle Functional Specification Program Review Checklist Complexity Determination / Estimate Technical Specification Test Support Unit Test Plan Program Source Code Code Bundle / Demo Unit Test Results Support (optional) Pre-Production Support Technical Review  Client Review  Client Review Programmer Driven USER Driven Functional Design Estimate Technical Design Deliver Test Support Develop Methodology Component  Communication & Coordination (all teams)  Technical Design Walkthrough  Code Review  Client Sign Off  Legend Task With Deliverable Task Without Deliverable Optional Service Area Process Checkpoint

The WaterFall Method – A simplified view Analysis Design Coding Test / Deploy Users define what they want from the system Programmers re-define what they believe the users want in a more structured manner Actual program is built using an appropriate computer language like C, Java, VisualBasic Application is tested and then deployed in the end users machine

The WaterFall Method – Deliverables Analysis Design Coding Test / Deploy Requirements Analysis Document written in simple English language Systems Specifications written in terms of e.g. TABLES, COLUMNS, METHODS, FUNCTIONS Programs written in an appropriate language and tested individually. Unit Test Report for each program All programs tested together to ensure compatibility and consistency Integration Test Report

Waterfall Process Assumptions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Waterfall Process Limitations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What did the customer really want ?

An Iterative Development Process... ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

An Incremental Development Process... ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Goals and Features of Each Iteration ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

BIS08 Application Development - II

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BIS08 Application Development - II