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SOA: the basics

What it is.

What it is not.

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SOA: the false, the ideal, the real

False: SOA equals web services.

SOA equals distributed services.

Ideal: SOA cleanly partitions andconsistently represent business services.

Real: SOA is a fundamental change in theway we do business.

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Real SOA

Changed mindset: service-oriented

context for business logic.

Changed automation logic: service-

oriented applications.

Changed infrastructure: service-oriented

technologies.

A top-down organization transformation

requiring real commitment.

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SOA Characteristics

Loosely coupled: minimizes dependencies

between services.

Contractual: adhere to agreement on

service descriptions.

Autonomous: control the business logic

they encapsulate.

Abstract: hide the business logic from the

service consumers.

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SOA Characteristics

Reusable: divide business logic into

reusable services.

Composable: facilitate the assembly of

composite services.

Stateless: minimize retained information

specific to an activity.

Discoverable: self-described so that they

can be found and assessed.

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Potential Benefits

Based on open standards.

Supports vendor diversity.

Fosters intrinsic interoperability.Promotes discovery.

Promotes federation.

Fosters inherent reusability.Emphasizes extensibility.

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Potential Benefits

Promotes organizational agility.

Supports incremental implementation.

Technical architecture that adheres to and

supports the principles of service

orientation.

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Common Misperceptions

SOA is just Web services.

SOA is just a marketing term.

SOA is just distributed computing.

SOA is a magic global solution to general

interoperability.

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Business

log

ic

Focus on the Business Process

and Services

Application

a

Application

c

Application

b

Applicatio

n

logic

Source: Service-Oriented Architecture, Thomas Erl

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Application

layer

Services

interfacelayer

Business

processlayer

Application-oriented

services

Business-orientedservices

Focus on the Business Process

and Services

.NET J2EE Legacy

Source: Service-Oriented Architecture, Thomas Erl

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Application

layer

Services

interfacelayer

Business

processlayer

Focus on the Business Process

and Services

.NET J2EE Legacy

Source: Service-Oriented Architecture, Thomas Erl

orchestration service

layer

business service layer

application service layer

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Common Pitfalls

Not basing SOA on standards.

Not creating a transition plan.

Not starting with a solid XML foundationarchitecture and skill set.

Not understanding SOA performance

requirements.Not understanding web services security.

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Summing Up SOA

Not a magic trick.

Not a magic solution.

Not an easy thing to do correctly.The wavelet of the present.

The wave of the future.

A useful architectural concept.A potential business facilitator.

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Resources

Douglas K. Barry, Web Services andService-Oriented Architectures: the savvymanagers guide.

Thomas Erl, Service-OrientedArchitecture: concepts, technology anddesign.

Thomas Erl, Service-OrientedArchitecture: a field guide to integratingXML and web services.