Distributed computing



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distcomp

IDEAL SEPARATION

  • What to request: application programmer must figure this out, e.g. access customer database.
  • Where to do it: application programmer should not need to know where, because this adds complexity + if location changes, application break.
  • How to ask for it: want a uniform interface.

WHERE TO DO IT: ORGANIZATION OF CLIENTS AND SERVERS

  • A service is a piece of work to do. Will be done by a server.
  • A client who wants a service sends a message to a service broker for that service. The server gets work from the broker and commonly responds directly to the client. A server is a process.
  • More basic approach: Each server has a port from which it can receive requests.
  • Difference: In client-broker-server model, many servers can offer the same service. In direct client-server approach, client must request a service from a particular server.
  • client…client
  • Service broker
  • server…server
  • server
  • client

ALTERNATIVE: NAME SERVER

  • A service is a piece of work to do. Will be done by a server. Name Server knows where services are done
  • Example: Client requests address of server from the Name Server and then communicates directly with that server..
  • Difference: Client-server communication is direct, so may be more efficient.
  • client…client
  • Service broker
  • Client … client
  • server
  • client

HOW TO ASK FOR IT: OBJECT-BASED

  • Encapsulation of data behind functional interface.
  • Inheritance is optional but interface is the contract.
  • So need a technique for both synchronous and asynchronous procedure calls.

REFERENCE EXAMPLE: CORBA OBJECT REQUEST BROKER

  • Send operation to ORB with its parameters.
  • ORB routes operation to proper site for execution.
  • Arranges for response to be sent to you directly or indirectly.
  • Operations can be “events” so can allow interrupts from servers to clients.

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