introduction to soa - extract v1
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An Introductionto
SOAOctober 2006
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An Introduction An Introduction
toto Service Orientated Service Orientated
Architecture Architecture
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The Problem
Business Needs are rapidly
changing; regulations and policies
change faster than what their
supporting systems can handle
30+ years of development has
resulted in multiple monolithic
applications
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The Problem (cont)
Some effects of this current
monolithic environment:
Frozen business processes
Escalating support costs
Decreasing flexibility
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The Solution
A more flexible way to build
applications
A common Enterprise
Architecture, rather than
isolated architectures for
individual applications
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The Architecture
Service Orientated Architecture
So what is SOA?
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The Architecture
a paradigm for organizing and
utilizing distributed capabilities
under the control of differentdomains
a style of architecture in which
applications can be built bycombining loosely coupled and
interoperable services
SOA is …
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The Architecture
Can be used by
applications orother services
Services are pieces of functionality or
“mini-applications” that:
Are independent of theirunderlying platform and
programming language
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SOA Concepts
Service Provider
Underlying Capability
Service Bus
Service ConsumerThe Service
Service Invocation
Service Interface
Loosely coupledRegistry
Service Level Agreement (SLA)
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SOA in the Real World
CableTelevisionModel
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SOA Concepts Service Provider
Underlying Capability
A cable TV company(a service provider)
has the capacity(the underlying capability )
to collect and distributecontent (services)
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Service Bus
ServicesSOA Concepts
Wiring from the cable TVcompany makes adistribution grid
(the service bus)to supply the content(the services)
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SOA Concepts
The distributed TV signal(the service)
is available for the typicalusage in a residentialconsumer’s house (serviceconsumer )
Service Consumer
The Service
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A consumer accesses aprogram by connecting adevice to an outlet(service interface)
Service delivery(service invocation) occurswhen a device isconnected to the interface
SOA Concepts Service Invocation
Service Interface
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Cable TV Model
Service Provider
Service Bus
Consumer
Interface
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SOA Concepts
The consumer can connectdifferent devices (TV, VCR,DVR, etc.) to the interface; theprovider is not concerned with
how the service is used
The provider can send differenttypes services (satellite signal,broadcast signal, DVD, etc); theconsumer is not concerned with
the service’s source.
Therefore … the end points are
said to be Loosely Coupled
Loosely Coupled
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SOA Concepts Registry
The service provider creates alist of available services(shows available).
Also provided any informationneeded to use the service is
(time, channel, duration, etc.)
Service consumers can browsethe list to determine what
service they want to consume
This is the Registry
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SOA Concepts Service Level Agreements
The Service Provider and theService Consumer have aagreement or contract
(Service Level Agreement)which sets the monthly fee fora specified number of available channels
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SOA Model
Service Provider
Service Bus
Consumer
Interface
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Provider
SOA Model
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Service Bus
SOA Model
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Consumer
Business Application
SOA Model
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Interface
Standards
Framework
Reference Model
Lifecycle Management
Security Maintenance
Environment
SOA Model
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Architecture Architecture
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SOA Model
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Questions…?
October 2006