A Practical Guide to SOA for IT Architects

TM
A Practical Guide to SOA
for IT Architects
January 2005
TM
A Practical Guide to SOA for IT Architects
A Practical Guide to SOA for IT Architects A Systinet White Paper
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Copyright 2005, Systinet Corp. Page 2 of 14
TM
A Practical Guide to SOA
for IT Architects
Contents
Executive Summary ................................................ 4 Business Service Lifecycle Planner .............10
The Business Value of SOA ............................... 4 Business Services Registries EnableLifecycle Management ........................................11Key SOA Design Considerations .................... 4 The Evolution To SOA .........................................11Creating Your SOA Foundation: The Business Service Lifecycle ...................... 7 Appendix A: Planning ........................................................................................ 7 Web Services Enablement Platforms .........12Enablement ................................................................................ 8 Examples of Web Services Publishing .................................................................................... 8 Enablement Platforms .....................................................12Discovery ..................................................................................... 9Management and Security ........................................... 9 Appendix B: SOA Defined ................................12Analysis ......................................................................................... 9 Appendix C: Glossary ..........................................13
About Systinet Corporation .............................14
Copyright 2005, Systinet Corp. Page 3 of 14
TM
A Practical Guide to SOA for IT Architects
Executive Summary
As a strategy for creating a flexible and agile IT, service-oriented architec- ing provider, and involves major rework to change providers or even toture (SOA) has gained considerable momentum in recent years, largely upgrade between versions of a single product.due to the advent of standards-based Web services. There are somepowerful business drivers for implementing SOA today: In a Web services environment, these same services communicate usingstandard protocols and formats supported by multiple vendors. Messages3IT Agility and Lower Costs are XML documents described using standard XML schemas. ServiceSOAs make IT more responsive to changing business demands and interfaces are defined using WSDL definitions and implemented usingrequirements. Reconfiguring business services is simple, fast and low-cost. SOAP messaging, with additional functionality provided by the layeredWS-* standards. Changing technologies or versions is simplified by the3Maximizing Enterprise Application Investments lightweight nature of the standards and the overwhelming adoption ofSOAs are not a rip-and-replace strategy-they wrap and reuse busi- Web services standards by technology vendors and corporate developers.ness functions from existing enterprise applications and make themavailable to a significantly broader audience without change. SOA SOAs have some distinct advantages over other architectures. First, inter-encourages reuse and avoids unnecessary duplication and reinvention. operability is an innate characteristic of a service-oriented approach. Asdescribed in the example above, SOAs built using Web services support3Facilitating New Applications service integration based on universally accepted industry standards.Web service-based SOAs smooth the development and management When interoperability is an inherent characteristic of all IT systems andof composite applications. Composite applications improve business purchased software, the problem of application ... [download for more]