Thomas Erl The Architecture Of Service Orientation

This Presentation Courtesy of the
International SOA Symposium
October 7-8, 2008 Amsterdam Arena
www.soasymposium.com
info@soasymposium.com

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The Architecture of
Service-Orientation

Thomas Erl, SOA Systems Inc.
Copyright © SOA Systems Inc. (www.soasystems.com)

The Architecture of Service-Orientation (Copyright © SOA Systems Inc. soacp.com, soaschool.com) 1

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Agenda

• the seven goals of service-oriented computing
• the eight principles of service-orientation
• the four characteristics of SOA
• the four types of SOA
• how they all relate and why


The Endless IT Progress Cycle
Business demands
and trends create
automation
requirements that the
IT community strives to
fulfill.
New method
and technology
innovations produced
by the IT community
help inspire
organizations to improve their existing business and
even try out new lines of business.


Service-Oriented Linguistics

• “Service-Oriented
Architecture”
• “Service-Orientation”
• “Service”
• “Service Composition”
Solution Logic”
• “Service Inventory”
Computing Platform”


The Seven Goals of
Service-Oriented Computing

• Increased Intrinsic Interoperability
• Increased Federation
• Increased Business and Technology
Domain Alignment
• Increased Vendor Diversification Options
• Increased ROI
• Increased Organizational Agility
• Reduced IT Burden



The Seven Goals of
Service-Oriented Computing

The first four goals lead to the attainment
Copyright © the latter three.
of SOA Systems Inc. (www.soasystems.com)

The Eight Principles of
Service-Orientation
• Service-Orientation is the design approach (or design
paradigm) used to build service-oriented solutions.

• The application of service-orientation results in the
creation of specific design characteristics, all of which
foster the attainment of the strategic goals associated
with service-oriented computing.

• Service-orientation is comprised of a series of design
principles that collectively establish these design
characteristics.

• An understanding of service-orientation is required to
build service-oriented solutions.



The Eight Principles of
Service-Orientation
The eight service-orientation design principles:
• Standardized Service Contract
• Service Loose Coupling
• Service Abstraction
• Service Reusability
• Service Autonomy
• Service Statelessness
• Service Discoverability
• Service Composability

The Eight
Principles of
Service-
Orientation

As services are
shaped by service-
orientation, they are
added to a service
inventory that
establishes an
environment in
support of the goals
of service-oriented
computing.


History of Service-Orientation
The service-orientation design paradigm has been
influenced by several established design platforms and
technology innovations.


The Four Characteristics of SOA

SOA is essentially a distinct technology architecture
established in support of service-oriented solutions and
therefore shaped by the demands and requirements of
applying service-orientation.
The fundamental characteristics of SOA are:

• business-driven

• vendor-neutral

• enterprise-centric

• composition-centric



Service-Oriented Architectural
Model: Business-Driven Context
Over time, the
scope and
context of a
technology
architecture is
outgrown by the
business as it
evolves in new
directions.

This results in the
need to
eventually
replace the
architecture.

Model: Business-Driven Context
By applying a
business-driven
strategic scope
to the
technology
architecture, it
can be kept in
constant synch
with how the
business evolves
over time.



Model: Vendor-Neutral Context
Vendor-centric technology
architectures are often
bound to corresponding
vendor platform
roadmaps.
This can reduce
opportunities to leverage
technology innovations
provided by other vendor
platforms and can result in
the need to eventually
replace the
implementation entirely
(which starts the cycle over
again).

Model: Vendor-Agnostic Context
If the architectural model
is designed to be neutral
to vendor platforms, it
maintains the freedom to
diversify its
implementation by
leveraging multiple
vendor technology
innovations.
This increases the
longevity of the
architecture as it is
allowed to augment and
evolve in response to
changing requirements.SOA Systems Inc. (www.soasystems.com)
Copyright ©


The Four Common SOA Types
There are four primary types of
service-oriented architecture,
each associated with a
specific scope:

• Service Architecture
(inner circle)
• Service Composition
Architecture
• Service Inventory
Architecture
• Service-Oriented Enterprise
Architecture (outer circle)


Service-
Oriented
Computing
Dynamics
Because
applying service-
orientation is
fundamental to
achieving the
seven strategic
goals, the
application
of service-
orientation
impacts all four
service-oriented
architecture
types.

1

The Endless IT Progress Cycle
The progress cycle that
continually transpires
between business and
IT communities results in
constant change.
When successfully
realized, service-
orientation and service-
oriented architecture
fully support and even
enable the accommodation of this change as a
natural characteristic of a service-oriented enterprise.


Q&A

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Thomas Erl The Architecture Of Service Orientation

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