Inside the Building Blocks

January 15, 2008 at 2:57 am (Unit 1) ()

Inside View

The Client Building Block

  • Runs the client side of the application
  • It runs on the OS that provides a GUI or an OOUI and that can access distributed services, wherever they may be.
  • The client also runs a component of the Distributed System Management (DSM) element.

The Server Building Block

  • Runs the server side of the application
  • The server application typically runs on top of some shrink-wrapped server software package.
  • The five contending server platforms for creating the next generation of client/server applications are SQL database severs, TP Monitors, groupware servers, Object servers and the Web server.
  • The server side depends on the OS to interface with the middleware building block.
  • The server also runs DSM component
  • It may be a simple agent or a shared object database etc.

The Middleware Building Block

  • Runs on both the client and server sides of an application
  • This broken into three category
    • Transport Stacks
    • NOS
    • Service-specific middleware
  • Middleware is the nervous system of the client/server infrastructure
  • This also has the DSM component


  • Runs on every node in the client/server network.
  • A managing workstation collects information from all its agents on the network and displays it graphically.
  • The managing workstation can also instruct its agents to perform actions on its behalf.

Server-to-server Middleware

  • Server-to-server interactions are usually client/server in nature – servers are clients to other servers.
  • However, some server-to-server interactions require specialized server middleware. For example, Two-Phase commit protocol may be used to coordinate a transaction that executes on multiple servers.
  • Servers on mail backbone will use special server-to-server middleware for doing store-and-forward type messaging.
  • But most modern software follows the client/server paradigm.

Server to Server


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