Class-6-Design-Architectre

Class-6-Design-Architectre - Design Models Architectural...

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    Design Models  Architectural Design
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    Design Models Analysis models focus on describing required data, functions, and behavior “ WHAT Software design deals with HOW the software to be structured What are the main components How are these components related to each other Design models provide details about SW data structures, database design Architecture, Interfaces and Components of the system Design Modeling is the last modeling activity It sets the stage for construction Design is “ an iterative process through which requirements are translated into a “blue print” for Construction
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    Design Models Requirement Specification Document Design Specification Document Components Data Structures GUI Interfaces Architecture Deployment
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    Design  Principles The design should be traceable to the analysis model. The design should not reinvent the wheel. The design should be structured to accommodate change . The design should be structured to degrade gently , even when abnormal data, events, or operating conditions are encountered. Design is not coding , coding is not design. New – Design Should be Easy to understand Easy to reuse Easy to change Easy to code Easy to test Easy to integrate
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    Fundamental  Concepts Abstraction What does the object do without any implication on how does it do it data, procedure, control Architecture — the overall structure of the software Patterns —”conveys the essence” of a proven design solution Modularity — compartmentalization of data and function Hiding — controlled interfaces Functional independence — single-minded function and low coupling Refinement — elaboration of detail for all abstractions Refactoring — a reorganization technique that simplifies the design
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    Data Abstraction   is a named collection of data that describes a data object door door door implemented as a data structure manufacturer manufacturer model number model number type type swing direction swing direction weight weight opening mechanism opening mechanism Abstraction Denotes the essential characteristics of an object that distinguishes it from all kinds of objects.
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    Procedural Abstraction  is a sequence of instructions that have limited and specific  function “ Open open open implemented with a "knowledge" of the object that is associated with enter details of enter details of enter algorithm algorithm repeat until door opens turn knob clockwise; if knob doesn't turn, then take key out; find correct key; insert in lock; endif pull/push door move out of way; end repeat
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    Architecture Is the structure or organization of program components •Manner of interaction •The structure of data that are used by the components Architecture design shows: 1. Structural properties This aspect of the architectural design representation defines:
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Class-6-Design-Architectre - Design Models Architectural...

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