Columbia COMS 3156 - Design (25 pages)

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Design



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Design

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Pages:
25
School:
Columbia University
Course:
Coms 3156 - Software Engineering

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Software Engineering 3156 15 Oct 01 12 Design Phil Gross Administrivia Due date for Design Tue or Thurs Two extra days for design or implementation ACM talk on C for Java Programmers Thursday 6 8pm Location TBD 2 Requirements Tweaking Posted to webboard Some things had accidently been dropped Attacked is back so is SendMap Deltas start immediately Go is when you re ready to play 3 A Note on Iterations It would be better if we had a few A living demonstration on why straight through plans are bad 4 A Note on Good Design Adjustments are easy Result of good design Or using a well designed frameworks Frameworks are just about the hardest thing to architect 5 A Note on Optimization Knuth s laws of Optimization First Law Don t Second Law for experts only Not Yet Try to get the thing working before you do any optimization 6 Case Study Denver Airport Approved in 1989 with intended opening in 1993 Mind bogglingly huge 53 square miles Budgeted for 2 5 billion Fully automated baggage handling system 7 Denver Airport Baggage System budgeted at 193 million Approx 20 miles of track Barcoded luggage scanned by lasers 4000 telecars carry it to destination Tracked by photocells Run by 300 computers 8 Timeline Mayor s Humiliation March 2 1993 October 25 1993 Mayor Webb announces the second airport opening delay The December 19 1993 opening date is changed to March 9 1994 to accommodate changes made by the airlines allow more time to test critical airport systems train airline ticket agents and other workers and complete installation of fire and security systems March 1 1994 Denver Mayor Wellington Webb announces the first airport opening delay The October 31 1993 opening date is changed to December 19 1993 to allow for a seven week debugging of hundreds of systems Mayor Webb announces the third airport opening delay The March 9 1994 opening date is changed to May 15 1994 to accommodate problems of troubleshooting the airport s complex baggage system Mayor Webb further asserts that



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