Concept of SOA
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Internal presentation on SOA I gave before moving our good old monolithic application to this new architecture
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Concept of SOA
- 1. SOAService-Oriented Architecture Divide and Conquer Sylvain Witmeyer - April 2015
- 2. Who uses SOA ● Ebay(2006) - 2Pb data - +100k lines code / 2 weeks ● IBM - 77 shareables and reusables services in prod ● Amazon(2002) - all their infrastructure ● Twitter ● Facebook - via Apache Thrift
- 3. Monolithic vs SOA SOA UI Business Logic Data Access Layer DB Monolithic UI service service service service DB DB DB UI / worker
- 5. Service Oriented Architecture ● SOA is an Architecture for building businesses applications on top of a collection of services ● Service : Functionality well-defined, self-contained, and does not depend on the context or state of other services ● Focus on Service not on Domain
- 6. Everything simple is fast. Everything which is complex is unusable. Paul Valéry
- 7. SOA Manifesto ● Business value over technical strategy ● Strategic goals over project-specific benefits ● Intrinsic interoperability over custom integration ● Shared services over specific-purpose implementations ● Flexibility over optimization ● Evolutionary refinement over pursuit of initial perfection
- 8. Highlights ● Less intimidating for new developers ● Continuous Deployment is easier ● Fine tuning for scaling the application ● Decrease commits conflicts ● No long-term commitment to a technology
- 9. SOA Design Principles ● Loosely coupled ● Autonomy ● Abstraction ● Reusability ● Discoverability ● Interoperability ● Service Contract ● Stateless ● Composibility-Granularity
- 10. Service Contract Public document(s) that express terms of service (WSDL, REST API Doc) SERVICECONSUMER CONTRACT network
- 11. Loosely Coupled Service and Consumer are independent SERVICE SERVICE INTERFACE - API CONSUMER CONSUMER SERVICE
- 12. Autonomy Services encapsulate resources and Business Logic SERVICE Resources & logic SERVICE Resources & logic
- 13. Service Abstraction Service hides the Logic to the consumer CONSUMER SERVICE Resources & Business logic network
- 14. Reusability and Interoperability Services can be used by several and differents consumers SERVICE CONSUMER CONSUMER CONSUMER network
- 15. Stateless ● Service doesn’t care about what it did and what it will do. ● Minimize holding any activity or processing state Information (session data is bad, messaging queue).
- 16. Discoverability ● Consumers should easily find and understand what Services are made for. ● Better Service reusability. ● Service directory.
- 17. Service Composition A service can aggregate other services SERVICE SERVICE SERVICE BIG SERVICECONSUMER network network
- 18. Task, Entity, Utility Task Service Business Service with business task or process i.e : AuthenticationService, OrderValidationService Utility Service Non-business Service i.e : LogService, MessagingService Entity Service Service handling Business Entities i.e : UserService, ProgramService
- 19. Why SOA fails From A Comprehensive Introduction to Everything SOA Mehmet Akyuz
- 20. SOA Governance ● Plan – Identify and analyze the core governance areas for improvement. Establish objectives/plan and specific measures for a proposed increment. Previously deployed increments are also evaluated for any necessary improvement. ● Define – Define the SOA Governance Model Transition Plans required to deliver the objectives defined in the Plan phase. ● Implement – Implement the Transition Plans including deployment of processes, organization, and technology aspects of the SOA Governance Model. ● Monitor – Monitor the effectiveness of the currently deployed SOA Governance Regimen and whether it is meeting its intended purpose. This phase may start another iteration of the SGVM. https://www.opengroup.org/soa/source-book/gov/sgvm.htm
- 21. If you can’t measure something, you can’t understand it. If you can’t understand it, you can’t control it. If you can’t control it, you can’t improve it H. James Harrington
- 22. Monitoring & Deployment ● Monitoring and QA are the same thing ● Amazon has a universal service registry where you can find out reflectively (programmatically) about every service, what its APIs are, and also whether it is currently up, and where. ● Create a reusable dashboard ● Continuous Integration
- 23. Amazon Mandate by J.Bezos 2002 1) All teams will henceforth expose their data and functionality through service interfaces. 2) Teams must communicate with each other through these interfaces. 3) There will be no other form of interprocess communication allowed: no direct linking, no direct reads of another team's data store, no shared-memory model, no back-doors whatsoever. The only communication allowed is via service interface calls over the network. 4) It doesn't matter what technology they use. HTTP, Corba, Pubsub, custom protocols -- doesn't matter. Bezos doesn't care. 5) All service interfaces, without exception, must be designed from the ground up to be externalizable. That is to say, the team must plan and design to be able to expose the interface to developers in the outside world. No exceptions. 6) Anyone who doesn't do this will be fired. 7) Thank you; have a nice day!
- 24. Questions to solve ● Service authentication and authorization ? ● What should be included in each Service ? ● API versioning and Continuous Integration, how do they get along?