The API for the Internet protocols

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Chapter 3 Interprocess Communication

• Introduction
• The API for the Internet protocols
• External data representation and marshalling
• Client-Server communication

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What happens when several clients send requests
to the server concurrently?
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• Issues
• At language-level data (for comm) are stored in
  data structures
• At TCP/UDP-level data are communicated as
  messages or streams of bytes hence,
  conversion/flattening is needed
• Problem? Different machines have different
  primitive data reps, e.g., big-endian and
  little-endian order of integers, float-type, char
  codes
• Marshalling (before trans) and unmarshalling
  (restored to original on arrival)
• Either both machines agree on a format type
  (included in parameter list) or an intermediate
  external standard (external data rep) is used,
  e.g., CORBA Common Data Rep (CDR)/IDL for many
  languages Java object serialization for Java
  code only, Sun XDR standard for Sun NFSs

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