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SOA: the basics

SOA: the basics. What it is. What it is not. SOA: the false, the ideal, the real. False: SOA equals web services. SOA equals distributed services. Ideal: SOA cleanly partitions and consistently represent business services.

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SOA: the basics

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  1. SOA: the basics What it is. What it is not.

  2. SOA: the false, the ideal, the real • False: SOA equals web services. SOA equals distributed services. • Ideal: SOA cleanly partitions and consistently represent business services. • Real: SOA is a fundamental change in the way we do business.

  3. Real SOA • Changed mindset: service-oriented context for business logic. • Changed automation logic: service-oriented applications. • Changed infrastructure: service-oriented technologies. • A top-down organization transformation requiring real commitment.

  4. SOA Characteristics • Loosely coupled: minimizes dependencies between services. • Contractual: adhere to agreement on service descriptions. • Autonomous: control the business logic they encapsulate. • Abstract: hide the business logic from the service consumers.

  5. SOA Characteristics • Reusable: divide business logic into reusable services. • Composable: facilitate the assembly of composite services. • Stateless: minimize retained information specific to an activity. • Discoverable: self-described so that they can be found and assessed.

  6. Potential Benefits • Based on open standards. • Supports vendor diversity. • Fosters intrinsic interoperability. • Promotes discovery. • Promotes federation. • Fosters inherent reusability. • Emphasizes extensibility.

  7. Potential Benefits • Promotes organizational agility. • Supports incremental implementation. Technical architecture that adheres to and supports the principles of service orientation.

  8. Common Misperceptions • SOA is just Web services. • SOA is just a marketing term. • SOA is just distributed computing. SOA is a magic global solution to general interoperability.

  9. Business logic Focus on the Business– Process and Services Application a Application b Application c Application logic Source: Service-Oriented Architecture, Thomas Erl

  10. Focus on the Business– Process and Services Business process layer Business-oriented services Services interface layer Application-oriented services Application layer .NET J2EE Legacy Source: Service-Oriented Architecture, Thomas Erl

  11. orchestration service layer business service layer application service layer Focus on the Business– Process and Services Business process layer Services interface layer Application layer .NET J2EE Legacy Source: Service-Oriented Architecture, Thomas Erl

  12. Common Pitfalls • Not basing SOA on standards. • Not creating a transition plan. • Not starting with a solid XML foundation architecture and skill set. • Not understanding SOA performance requirements. • Not understanding web services security.

  13. Summing Up SOA • Not a magic trick. • Not a magic solution. • Not an easy thing to do correctly. • The wavelet of the present. • The wave of the future. • A useful architectural concept. • A potential business facilitator.

  14. Resources • Douglas K. Barry, Web Services and Service-Oriented Architectures: the savvy manager’s guide. • Thomas Erl, Service-Oriented Architecture: concepts, technology and design. • Thomas Erl, Service-Oriented Architecture: a field guide to integrating XML and web services.

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