1.
Service-Oriented Architecture
From Webservices to API’s and
beyond
Haufe.Group - http://www.haufe-lexware.com

2.
Haufe.Group - http://www.haufe-lexware.com

3.
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
Haufe.Group - http://www.haufe-lexware.com

4.
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
Haufe.Group - http://www.haufe-lexware.com

5.
SOA Goals
• How to better integratedistributed systems
- It quickly became synonymous with a set of protocols and standards:
XML, SOAP/HTTP, WS-*
- It also became associated with aset of standardized components:
ESB, Registry, Gateway
Haufe.Group - http://www.haufe-lexware.com

6.
Reality Check
Who is the greatest API successstory of all
time?
Whois the greatest SOA successstory of
all time?
Haufe.Group - http://www.haufe-lexware.com

7.
So what went wrong
Integration versus Interoperability
IT versus Developer
Control versus Incentive
Haufe.Group - http://www.haufe-lexware.com

8.
SOA versus API
Category SOA API
Business Context
• ITdriven
• Cost savings
• Defined byprocess
• Business driven
• Revenueand BizDev
• Defined as product
Perspective
• EnterpriseArchitects
• Service Taxonomy
• CanonicalData
• Developers
• Developers
• Developers!
Non-Functional
• Server-to-server
• Implicit controls
• Mobile
• Consumer-facing
• Web scale
Haufe.Group - http://www.haufe-lexware.com

9.
Haufe.Group - http://www.haufe-lexware.com

10.
Haufe.Group - http://www.haufe-lexware.com

11.
Haufe.Group - http://www.haufe-lexware.com

12.
The API value chain
• Informaton
• Product
• Service
Business Asset
• API
• SLA
• EULA
API Provider
• Building App
Developer
• Using API
Application
• Using App
End-User
Haufe.Group - http://www.haufe-lexware.com

13.
API Management
API
Portal
API Owners,
Developers,
Admin
External and
Partner Developers
End User
Service
Endpoints
Haufe.Group - http://www.haufe-lexware.com

14.
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
Haufe.Group - http://www.haufe-lexware.com

15.
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
Haufe.Group - http://www.haufe-lexware.com

16.
Remember, why APIs are working
Simplicity
Self-Service
Lowbarrier to use
Access 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

17.
Where do we go next
Rise of JavaScript in the
Enterprise
Microservices Web APIs the default for
IoT
Haufe.Group - http://www.haufe-lexware.com

18.
Microservices
Haufe.Group - http://www.haufe-lexware.com