Introduction The API for the Internet protocols External data representation and marshalling
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Introduction The API for the Internet protocols External data representation and marshalling Client-Server communication Chapter 3: Interprocess Communication 1
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Chapter 3: Interprocess Communication. Introduction The API for the Internet protocols External data representation and marshalling Client-Server communication. What happens when several clients send requests to the server concurrently?. Issues - PowerPoint PPT Presentation
Transcript of Introduction The API for the Internet protocols External data representation and marshalling
Introduction The API for the Internet protocols External data representation and marshalling Client-Server communication
Chapter 3: Interprocess 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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