soa - from webservices to apis

Service-Oriented Architecture

From Webservices to API’s and beyond

Haufe.Group - http://www.haufe-lexware.com

Some perspective

1999 – Web

Meets the

Enterprise

2000-03 – Rise

of SOA

2004-07 – SOA

Golden Age

2008-11 –

A New Paradigm

2012-

APIs Prevail


SOA Manifesto

• Business value over technical strategy

• Strategic goals over project-specific benefits

• Intrinsic interoperability over custom integration

• Shared services over specific-purpose implementations

• Flexibility over optimization

• Evolutionary refinement over pursuit of initial perfection

From http://www.soa-manifesto.org


SOA Goals

• How to better integrate distributed systems

- It quickly became synonymous with a set of protocols and standards: XML, SOAP/HTTP, WS-*

- It also became associated with a set of standardized components: ESB, Registry, Gateway


Reality Check

Who is the greatest API success story of all time?

Who is the greatest SOA success story of all time?


So what went wrong

Integration versus Interoperability

IT versus Developer

Control versus Incentive


SOA versus API

Category SOA API

Business Context• IT driven

• Cost savings• Defined by process

• Business driven• Revenue and BizDev• Defined as product

Perspective• Enterprise Architects• Service Taxonomy• Canonical Data

• Developers• Developers• Developers!

Non-Functional• Server-to-server• Implicit controls

• Mobile• Consumer-facing

• Web scale


The API value chain

• Informaton

• Product

• Service

Business Asset

• API

• SLA

• EULA

API Provider• Building App

Developer

• Using API

Application• Using App

End-User


API Management

API

Portal

API Owners, Developers, Admin

External and Partner Developers

End User

ServiceEndpoints


Connector vs Component

“[REST] is achieved by placing constraints on connector semantics where other styles have

focused on component semantics.” (Roy Fielding)

Focus is on how things connect,

not how they work


Ensuring Connectors Work Together

1. Identification of Resources • URL, URN

2. Resource Representation• Media types

3. Self-describing Messages• HTTP operations

4. Hypermedia• Links and forms


Remember, why APIs are working

SimplicitySelf-Service

Low barrier to useAccess to valuable resources

http://apievangelist.com/2014/05/06/remembering-why-this-whole-api-thing-is-working--apidays-berlin/Haufe.Group - http://www.haufe-lexware.com

Where do we go next

Rise of JavaScript in the Enterprise

Microservices Web APIs the default for IoT


Microservices


soa - from webservices to apis

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