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Distributed Architecture (Chapter 10) ((Client/Server (Disadvantages…

- - - - Responsibility separation such as user interface presentation and business logic processing
      - Reusability of server components
    - - Lack of heterogeneous infrastructure to deal with the requirement changes
      - Security complications
      - Server availability and reliability
      - Testability and scalability
  - - - Middle layer is easy to change
      - Have portable and nonproprietary design and implementation
      - Middle layer can provide multi-threading support
      - Reduces traffic on the network
    - - Difficulty in testing due to lack of testing tools
      - Adding multiple servers in the system makes the server reliability and availability even more critical
  - - - Server component implementation and location transparency,
      - Changeability and extensibility,
      - Feasibility of run time changes of server components (add or remove server components)
    - - Inefficiency due to the overhead of proxies
      - Low fault tolerance
      - Difficulty testing
  - - - Loosely-coupled connection: Loose-coupling is the key attribute of SOA.
      - Each service component is independent from other services due to the stateless service feature.
      - The implementation of a service will not affect the application of the service as long as the exposed interface is not changed.
      - It makes SOA software much easier to evolve and update.
      - Interoperability: Technically any client or any service can access other services regardless of their platform, technology, vendors, or language implementations.
      - Reusability: Any service can be reused by any other service,. Because clients of a service only need to know its public interfaces, service composition and integration become much easier.
      - SOA based business application development comes much more efficient in term of time and cost.