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Are APIs and SOA Converging?
- 1. Copyright © 2001-2013 SOA Software, Inc. All Rights Reserved.
Are APIs and SOA
Converging?
Sachin Agarwal
VP Product Marketing
SOA Software
- 4. Copyright © 2001-2013 SOA Software, Inc. All Rights Reserved.
What is SOA?
• Service Oriented Architecture : A loosely-coupled architecture designed to
meet the business needs of the organization.
- 5. Copyright © 2001-2013 SOA Software, Inc. All Rights Reserved.
SOAP, WSDL, UDDI and Repository
• SOA was initially focused on UDDI, WSDL
and SOAP
• SOAP had widespread adoption
• WSDL provided interface definition
• UDDI standard, while ratified, lost support
• UDDI Registry as replaced by the
Repository
• But due to complexities of type of
integration challenges, SOAP/XML
became “heavy weight”
- 7. Copyright © 2001-2013 SOA Software, Inc. All Rights Reserved.
What is an API?
Your ApplicationYour APIYour Customers
- 8. Copyright © 2001-2013 SOA Software, Inc. All Rights Reserved.
Characteristics of an API
• Well documented
(human-readable)
• Easy to consume
• Can be self-
provisioned by
developers and
partners
• Published through an
API Portal
- 10. Copyright © 2001-2013 SOA Software, Inc. All Rights Reserved.
Capture new Opportunities with APIs
Drive Innovation
Increase Reach
Support New Devices
Discover New Business Models
Increase Partner Network
- 11. Copyright © 2001-2013 SOA Software, Inc. All Rights Reserved.
The API Advantage
• Easy to consume
• Well documented
• Self Provisioned
• Developers are attracted to use the best APIs
• Business Driven
- 13. Copyright © 2001-2013 SOA Software, Inc. All Rights Reserved.
Myths and Facts
Myth Fact
SOA is a technology SOA is a design philosophy independent of
any vendor, product, technology or industry
trend.
SOA requires web
services/SOAP
SOA is not limited to SOAP/web services
APIs are not SOA APIs are services, and in that aspect are
more like SOA
APIs require REST/JSON APIs are not limited to REST/JSON
SOA is internal, APIs are
external
While the open model of APIs make it more
suited for external consumption, they could
each be used in either scenarios
- 15. Copyright © 2001-2013 SOA Software, Inc. All Rights Reserved.
The 3-Tiers of APIs and SOA Lifecycle
Business
Foundation/
Functional
Tier
Service Arch.
Lifecycle
Data Arch.
API Design
Non-
Functional
Tier
Security,
Mediation,
Orchestration,
QoS, Analytics
Protocol
Tier
Publishing,
OAuth, Portal,
WSDL Swagger
,etc.
- 16. Copyright © 2001-2013 SOA Software, Inc. All Rights Reserved.
APIs vs. SOA
• APIs are a superset of Web Services – it is a business differentiation,
not a technical one
– Business, product focus
– APIs are open, easy to consume
• Documentation
– APIs
• Pro : Human readable
• Con : Change management is subjective
– Web Services primarily use WSDL and WS-Policy
• Pro : Change management is explicit
• Con : Difficult to understand
• Security
– APIs typically leverage OAuth or HTTP request signing mechanisms for
security
• Transport-based (HTTP)
– SOA leverages WS-S, SAML, WS-Trust, etc
• Message-based
- 17. Copyright © 2001-2013 SOA Software, Inc. All Rights Reserved.
The Need for Both
• Simplify Documentation
– Document generation
– Code generation
• APIs may need to be SOAP as well as JSON/REST
• Security mediation between web standards and WS-* standards is
critical
• A deep understanding of the different standards and policies is
required, including:
– OAuth 1.0a/2.0
– Header-based signature mechanisms
– SAML
– WS-Security
– XACML
– OpenID/Connect
- 18. Copyright © 2001-2013 SOA Software, Inc. All Rights Reserved.
Are API and SOA Converging?
SOA, in its focus on machine to machine integration and
standardization, forgot about the human in the equation.
APIs, in their focus on ease of use, have forgotten about
management, lifecycle and control.
You need both
- 19. Copyright © 2001-2013 SOA Software, Inc. All Rights Reserved.
API and SOA Resources
• Resource Center
– http://resource.soa.com/
• Webinar Recording
– http://resource.soa.com/resource/webinars
• Follow us on:
www.facebook.com/soasoftware
www.linkedin.com/company/soasoftware
@soasoftwareinc
