1. © 2013 ACM
About ACM
ACM, the Association for Computing Machinery is the world’s largest educational and
scientific computing society, uniting educators, researchers and professionals to inspire
dialogue, share resources and address the field’s challenges.
ACM strengthens the computing profession’s collective voice through strong leadership,
promotion of the highest standards, and recognition of technical excellence.
ACM supports the professional growth of its members by providing opportunities for life-
long learning, career development, and professional networking.
With over 100,000 members from over 100 countries, ACM works to advance computing
as a science and a profession. www.acm.org

2. © 2013 ACM
The Distinguished Speakers Program
is made possible by
For additional information, please visit http://dsp.acm.org/

3. © 2013 ACM
Who am I? My name is Albert T. Wong (http://linkedin.com/in/atwong)

4. © 2013 ACM
Introduction to Services Oriented
Architecture (for People)
Adapted from http://www.slideshare.net/datainc/introduction-to-service-oriented-architecture

5. © 2013 ACM
Which one would you pick?
 Which is the ‘better’ implementation?
 Which is easier to maintain?
 Which is the more agile solution?
 To what extent can you use the features?
Scenario 1 Scenario 2

6. © 2013 ACM
What is SOA trying to solve?
SOA == Principals and
practices for designing
shared, reusable,
distributed services
Technical ProblemsTechnical Problems

7. © 2013 ACM
The Evolution of SOA
 Years ago electronic systems
were self-contained
monolithic systems
 Today’s gadgets are
pluggable and independent
 Standardized connections
The analogy of A/V Components

8. © 2013 ACM
The Evolution of Distributed Computing and Enterprise Application Integration
How it all grew…
Types of Integration
Application Integration
Different Approaches
Designed for SOA

9. © 2013 ACM
Benefits of SOA
 Efficient and effective usage of ‘Business Services’
 Greater agility
 Loosely-coupled with reusable assets and services
 Promotes productivity
– Reduces time-to-market
 Drives business processes closer to end users
 Technology agnostic
 Leverage and integrate existing
applications
 Build, maintain & extend vs. rip and replace
 Provide standard connections between
systems
 Abstract complexity for developers
Silo Oriented
Technical
Problems

10. © 2013 ACM
Drawing Parallels…
 Mumbai, India : Density of 49K-
65K people per sq km.
 What symbolizes Mumbai -
Gateway of India, Victoria
Terminus or the Dabbawalla?
 Why the Dabbawalla?
Studied by CMU, NITIE, Univ. of Pittsburg, CMM, etc.
Editorials in the Washington Post, NY Times, Indian news

11. © 2013 ACM
Discover
Customized Service
Consumers at
Different location
Collect and Route
Pickup and Deliver
Standardize

12. © 2013 ACM
Lessons from Dabbawalla
 Granularity:
– Contents are prepared individually and tagged
 Standardization:
– All containers are identical in size
– Each has unique markings for routing, traceability and delivery
that is understood by all the 4500+ semi-literate co-workers
 Integration and service assurance:
– Each of the 4500+ co-workers are not employed, but work
independently as franchises!
– Service is guaranteed. The association is a binding force.
 Low cost:
– Service charge ≈ $7 /month /dabba.
 Performance and speed:
– Pick up from homes.
– 200,000+ boxes distributed by hand before lunch time.
– Average of 4 changes of hands and 3 modes of transport (bus,
train, bicycle).
– Each Dabbawalla memorizes up to 35 address.
 High Reliability:
– Only one mix-up in 6million deliveries.
– Six sigma certified (reference http://www.mydabbawala.com
official website).
 Built in Redundancy
 Flexibility and Scalability
– Ability to serve new locations and add more customers

13. © 2013 ACM
Definition of SOA
 Service Oriented ArchitectureOriented Architecture
– Autonomous loosely coupled coarse grained business services that can be discovered
and accessed by other applications
 ServiceService Oriented ArchitectureArchitecture
– More agile application infrastructure that responds swiftly to shifting business / demands
and re-compose services
 Service OrientedService Oriented Architecture
– Broad framework on which enterprises build, deploy, re-compose and manage services
– Accessed through standard protocols
Can we define a Service Oriented Architecture?
Our version…
Principals and practices for designing shared,
reusable, distributed services

14. © 2013 ACM
Characteristics and key components of SOA
 Services are platform independent, self
describing interfaces (XML)
 Messages are formally defined
 Services can be discovered
 Services have quality of service
characteristics defined in policies
 Services can be provided on any platform
 Can be governed
InteroperableInteroperable
LooselyLoosely
CoupledCoupled
ReusableReusable
ComposableComposable
ScalableScalable
Key Components
Key Characteristics

15. © 2013 ACM
More Information
 Materials reused from - http://www.slideshare.net/datainc/introduction-to-service-oriented-
architecture
 Materials reused from - http://www.slideshare.net/thananum/introduction-to-soa-amp-its-
open-source-framework-1615798
 Additional material - http://www.docstoc.com/docs/21129965/Introduction-to-Service-
Oriented-Architecture-(SOA)