WebFund 2013F Lecture 19

Notes

==Assignment 4 remarks

• Shouldn’t need to use prototypes at all in assignment

1. Before insert, do a lookup

• • If there, you have the document and edit that

1. Search for a special room called “start”

• • Start is not a room, it’s a room pointer
  • Can put description of a room in there
  • Could have everything linked to the start room
    • Have all rooms exit to start
    • Title won’t be start

1. JavaScript string replace

• • Don’t use a for-loop
    • There are nice string manipulation routines in JavaScript

1. TA’s will be using their own custom database to test code
2. Look up how to do file uploads

• • Might do this in tutorial
  • Don’t have to do string checking, just have to check objects to make sure all fields are there and they aren’t undefined
  • Do all the exits refer to a room that actually exists?
    • Not super important to do
  • Each room has name, title, description exits, has a start room
    • Can say valid

1. Have to validate the data structure

• • Have to make sure you don’t import garbage

1. Don’t have to do this with AJAX

• • To get style points, probably going to have to do something nice
    • Probably don’t want to have to press submit a million times
• Always time costs when you distribute a system
• How’s it going to fail?
  • Anything from a database is expensive
• Want a static webserver for front end
  • Incoming requests first go through here, if it can handle it, it will hand it off and respond
  • If it can’t, it will send it back
• Gets don’t change server state, posts do
• Gets can be cached
• CDN
  • Content Distribution Network
  • Some combination between static servers and caching
• Reading is never a problem
• Searches are easy
• Writes are what slow you down
  • Cannot be automatically replicated
  • Changed the state of part of your database, essentially your data structure
  • This is what limits database scalability
• Fred Brooks