Giop

In distributed computing, GIOP (General Inter-ORB Protocol) is the abstract protocol by which ORBs communicate. IIOP (Internet Inter-Orb Protocol) is the implementation of GIOP for TCP/IP. The OMG defines three parts of GIOP:
  • the Common Data Representation (CDR) - transfer syntax mapping OMG IDL data types into a low-level representation for on-the-wire transfer between ORBs and Inter-ORB bridges.
  • message formats - messages are exchanged between agents to facilitate object requests, locate object implementations, and manage communication channels. Messages are:
    • Request
    • Reply
    • CancelRequest
    • LocateRequest
    • LocateReply
    • CloseConnection
    • MessageError
  • message-transport assumptions
    • connection orientated
    • reliable
    • can be viewed as a byte stream
    • provides some reasonable notification of disorderly connection loss
    • model for initiating connections can be mapped onto the general connection model of TCP/IP.

 

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