Architectural styles and patterns

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DEEP KUMAR SHARMA

M.TECH (2ND SEM)SOFTWARE ENGINEERING

Contents

ArchitectureSoftware architectureArchitecture StyleThe Definition of Architecture StylesArchitectural PatternsThe Definition of Architecture patternDifference between Pattern and Styles

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Architecture

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Software architecture considers two levels of design:

Data Design – action translates data objects defined as

part of the analysis model into data structures at the software component level and when necessary, a database architecture at the application level.

Architectural design – representation of the structure of software components, their properties and relations

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Architecture is a high level description of a solution to a problem

architecture includes-

Main Components Functionalities and properties of components

Major Relations Components collaborating among the components

Introduction

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An architectural style, sometimes called an architectural pattern

It provides an abstract framework for a family of systems

An architectural style improves partitioning and promotes design reuse by providing solutions to frequently recurring problems

Architectural Style

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An Architectural Style defines a set of rules that describe:

- The way in which the components interact

Architectural Style

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architecture styles and patterns as sets of principles that shape an application

some architectural styles describe deployment patterns, some describe structure and design issues, and others describe communication factors

Architectural Style

The Definition of Architecture Styles

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“An architectural style is a named collection of architectural design decisions that are applicable in a given development context, constrain architectural design decisions that are specific to a particular system within that context, and elicit beneficial qualities in each resulting system.”

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An architectural pattern is a general, reusable solution to a commonly occurring problem in software architecture within a given context

Architectural patterns are often documented as software design pattern

Architectural Patterns

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An architecture pattern is determined by-

A set of element types(such as data repository or a component) A topological layout of the element indicating their

interrelationships A set of semantic constraints(e.g. filters in a pipe-and-filter style

) A set of interaction mechanisms that shows how the elements

coordinate through the allowed topology.

Architectural Patterns

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The Definition of Architecture pattern

"An architectural pattern is a named collection of architectural design decisions that are applicable to a recurring design problem, parameterized to account for different software development contexts in which that problem appears “

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Difference between Pattern and Styles

The main difference is that a pattern can be seen as a solution to a problem, while a style is more general and does not require a problem to solve for its appearance.

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