Enterprise Soa Concept
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Enterprise Soa Concept

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Simple concept of SOA

Simple concept of SOA

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Enterprise Soa Concept Enterprise Soa Concept Presentation Transcript

  • Chapter 4. Service Oriented Architecture “ Enterprise SOA Service Oriented Architecture Best Practice” 2006-05-17 Byungwook Cho K.
  • What is software architecture?
    • “ An architecture is the set of significant decisions about organization of a software system” – Booch, Rumbaugh, Jacobson
    • “ The software architecture of program or computing system is the structure or structure of system, which comprise software elements, the externally visible properties of those elements, and relationships among them” – Brass, Clements, and Kazman
  • What is SOA?
    • "A SOA is software architecture that is based on the key concepts of application frontend,service,service repository, and service bus. A service consists of contract (WSDL), interface and implementation "
  • Elements of SOA
    • SOA is based on four key abstraction
      • Application frontend
      • Service
      • Service Repository
      • Service Bus
  • Life cycle of elements in SOA
    • The estimated lifecycles of data,services, application frontends , and technologies are different
  • Application front end
    • Application frontend is
      • Active player of an SOA
      • Service consumer
      • Initiate and control all activity of enterprise system
  • Service
    • Service is component of distinctive functional meaning that typically encapsulate a high-level business concept
    • Consists of
      • Contract
        • purpose, functionality, constraint, usage of service
      • Interface
        • Physical implementation of interface
      • Implementation
        • programs, configuration data ,database
        • Business logic , Data
    NOTE : The types of service [ from Service Oriented Architecture - Thomas Erl] Business Service vs Technical Service (utility Service, application service) Process service, Task centric service, Entity centric business service, utility application service. Hybrid application service.
  • Service
    • Conceptual structure of service
    NOTE: Every service is an entity of distinctive functional meaning that typically encapsulates a high-level business entity. Services impose a strong vertical slicing of application that defines the coarse-grained structure of the whole system.
  • Service repository
    • Service repository is “provides facilities to discover services and acquire all information to user the service “
    • Service repository is indispensable in long term
    • It contains
      • In addition to service contract : location,provider,contact ,usage fee,technical constraints,security issues and availble service level
      • SVC Info,ACL,SLA,Transactional properties of SVC & operation (CRUD)
      • In cross enterprise : security,user registration, service subscription,billing and versioning
  • Service repository
    • Binding Type
      • Development time binding
      • Runtime binding
        • By name
        • By properties
        • By reflection  method 를 가지고 오지만 , function 에 call 방식을 미리 알 수 없다 . Meta data 로 call 에 필요한 argument 들을 가지고 오고 , 거기에 argument 에 필요한 내용을 mapping 한다 .
        • * It can be replaced by ESB routing feature
  • Service bus
    • A service bus connects all participants of an SOA services and application frontend
    • Characteristics of service bus
      • Connectivity
      • Heterogeneity of technology
      • Heterogeneity of communication concept (MEP)
      • Technical service : logging,auditing,security,transformation,transaction