Basic HTML version of Foils prepared May 18 99

Foil 4 Basic 3 Tier Computing Model

From Distributed Objects for GEM General Earthquake Simulation Project Meeting JPL Pasadena -- April 22 99. by Geoffrey C. Fox
1 A server accepts input and produces output
  • A Web Server accepts HTTP request and returns a web page
  • a Database Server accepts a SQL request and returns records selected from database
  • An Object Broker accepts IIOP requests to invoke methods of an "object" (e.g. run a program)
2 IIOP and HTTP are two common protocols (formats of control data) for inter program messages
3 A Web browser (Netscape or Microsoft) can access any server at "the click of a button" with data from user refining action
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