Remote Method Invocation Question and Answers

1. What is RMI?
    Remote Method Invocation allows java object that executes on one machine and to invoke the method of a java object to execute on another machine. The steps involved in developing an RMI object are
  • Defining the interfaces
  • Implementing these interfaces
  • Compile the interfaces and their implementations with the java compiler
  • Compile the server implementation with RMI compiler
  • Run the RMI registry
  • Run the application
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2. What is RMI architecture?
  RMI architecture consists of four layers and each layer performs specific functions.
  • Application layer – contains the actual object definition.
  • Proxy layer – consists of stub and skeleton.
  • Remote Reference Layer – gets the stream of bytes from the transport layer and sends it to the proxy layer.
  • Transportation layer machine communication – responsible for handling the actual machine to machine communication.
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3. What is unicast remote object?
  All remote objects must extend unicast remote object, which provides functionality that is needed to make objects available from remote machines.
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4. Explain the methods, rebind() and lookup() in Naming class?
  • rebind() of the Naming class (found in java.rmi) is used to update the RMI registry on the server machine.
  • Naming.rebind ("AddServer", AddServerImpl);
  • lookup() of the Naming class accepts one arguments, the rmi URL and returns a reference to an object of type AddServerImpl.
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