1. Architectural styles and patterns
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Dr. Himanshu Hora
SRMS College of Engineering & Technology, Bareilly
INDIA

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 Architecture is a high level description of a solution to a
problem
 architecture (high level design) includes-
1. Main Components
Functionalities and properties of components
2. Major Relations
Components collaborating among the components
What is architecture ?

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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
What is Architectural Style ?

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 An Architectural Style defines a set of rules that
describe:
- The way in which the components interact
CATEGORY ARCHITECTURAL STYLE
Communication Service-oriented architecture(SOA),
Message Bus
Deployment Client/server, N-tier, 3-tier
Domain Domain driven design
Structure Component Based ,Object -Oriented,
Layered Architecture
What is 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
What is Architectural Style ?

6. The Definition of Architecture Styles
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R. N. Taylor, N. Medvidović and E. M. Dashofy,
Software Architecture: Foundations, Theory and Practice. Wiley, 2009.
“An architectural style is a named collection of
architectural design decisions that (1) are applicable
in a given development context, (2) constrain
architectural design decisions that are specific to a
particular system within that context, and (3) 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
What is Architectural Patterns?

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 An architecture pattern is determined by-
1)A set of element types(such as data repository or a
component)
2)A topological layout of the element indicating their
interrelationships
3)A set of semantic constraints(e.g. filters in a pipe-and-
filter style )
4)A set of interaction mechanisms that shows how the
elements coordinate through the allowed topology.
What is Architectural Patterns?

9. Figure- A small catalog of architectural patterns organized by is-a-relation

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R. N. Taylor, N. Medvidović and E. M. Dashofy,
Software architecture: Foundations, Theory and Practice. Wiley, 2009.
"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 “
The Definition of Architecture pattern

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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.
Difference between Pattern and Styles

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Thank You
Dr. Himanshu Hora
SRMS College of Engineering & Technology, Bareilly
INDIA