CS 580 Client-Server Spring Semester, 2004 Introduction
	Lecture Notes Index    Next     © 2004, All Rights Reserved, SDSU & Roger Whitney San Diego State University -- This page last updated 13-Jan-04

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Course Introduction

CGI, Fast-CGI, Servlets

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We will be using parts of JDK 1.4

NIO contains richer socket support

Logging

Not supported

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No one knows the entire API of either language

You should have good grasp of the common or core API

Collections, Files, Exceptions, Streams

• Java Doc
• Searching the API
• Compiling/running code
• Using Smalltalk browsers
• Naming conventions

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Introduction to Client-Server

What is Client-Server?

Application that initiates peer-to-peer communication

Translate user requests into requests for data from server via protocol

GUI often used to interact with user

Any program that waits for incoming communication requests from a client

Extracts requested information from data and return to client

Common Issues

• Authentication
• Authorization
• Data Security
• Privacy
• Protection
• Concurrency

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Powerbuilder

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What Client-Server Requires of a Programmer

• Designing robust protocols

• Network programming

• Designing usable computer-human interfaces

• Good documentation skills

• Good debugging skills

• Understand the information flow of the company/customer

• Mastery of concurrency

• Multi-platform development

• Database programming

• Security

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Programming Issues

Naming Convention for Classes, Variables & Methods

• Use full words – avoid abrvtns

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Names

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Comments

for i := 1 to Num do
 MeetsCriteria[ i ] := True;
for  i := 1 to Num / 2  do begin
 j := i + i;
 while ( j <= Num ) do begin
  MeetsCriteria[ j ] := False;
  j := j + i;
 end;
for i := 1 to Mun do
 if MeetsCriteria[ i ] then
  writeln( i, ' meets criteria ' );

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for PrimeCandidate:= 1 to Num do
   IsPrime[ PrimeCandidate] := True;
for  Factor:= 1 to Num / 2  do begin
   FactorableNumber := Factor + Factor ;
   while ( FactorableNumber <= Num ) do begin
      IsPrime[ FactorableNumber ] := False;
      FactorableNumber := FactorableNumber + Factor ;
   end;
end;
for PrimeCandidate:= 1 to Num do
   if IsPrime[ PrimeCandidate] then
      writeln( PrimeCandidate, ' is Prime ' );

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Commenting Paragraphs of Code

/* if allocation flag is zero */
if ( AllocFlag == 0 ) ...

/* if allocating a new member */
if ( AllocFlag == 0 ) ...

/* if allocating a new member */
if ( AllocFlag == NEW_MEMBER ) ...

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{ check each character in "InputStr" until a 
  dollar sign is found or all characters have 
  been checked }
Done   := false;
MaxPos := Length( InputStr );
i      := 1;
while ( (not Done) and (i <= MaxLen) ) begin
   if ( InputStr[ i ] = '$' ) then
      Done := True
   else
      i := i + 1
end;

{ find the command-word terminator }
Done   := false;
MaxPos := Length( InputStr );
i      := 1;
while ( (not Done) and (i <= MaxPos ) ) begin
   if ( InputStr[ i ] = '$' ) then
      Done := True
   else
      i := i + 1
end;

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{ find the command-word terminator }
FoundTheEnd      := false;
MaxCommandLength := Length( InputStr );
Index            := 1;
while ((not FoundTheEnd) and 
       (Index <= MaxCommandLength)) begin
   if ( InputStr[ Index ] = '$' ) then
      FoundTheEnd := True;
   else
      Index := Index + 1;
end;

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Commenting Data Declarations

var
   CursorX:      1..MaxCols;   { horizontal screen position of cursor }
   CursorY:      1..MaxRows;   { vertical position of cursor on screen }
   AntennaLength:   Real;   { length of antenna in meters: >= 2 }
   SignalStrength:   Integer;   { strength of signal in kilowatts: >= 1 }
   CharCode:      0..255;   { ASCII character code }
   CharAttib:      Integer;   { 0=Plain; 1=Italic; 2=Bold  }
   CharSize:         4..127;   { size of character in points }
Comment limitations on input data
Document flags to the bit level

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