WebFund 2013F Lecture 1

Audio from the lecture given on September 9, 2013 is available here.

Notes

September 9 Node

Web Browser <-talks to-> Server

               http <-- Stream of text or data byte stream from tcp and puts syntax on it

tcp <-- turns packets into continuous stream, controls sending, reordering etc ip <--packet based ethernet/wifi/...

now: Browser <-talks to-> Server program talking to program (embedded in html document that was loaded)

most of data on internet is encoded in http or smtp code that runs inside of browser is known as sandboxed everything you care about is in the sandbox

google tracks and monetizes you you are the product

bandwidth: how much can I get at once? latency: when I make a request, how long does it take for me to get the first bit

gmail has all kinds of code built in to predict what you want and predicts which emails you're going to want to read constantly modelling your behaviour to work well

Server PHP servlets <-- not actually going to learn any of these languages apache rails

node.js is javascript Why? runs pretty fast chromes v8 javascript engine and stuck on the server on browser access the DOM browser manipulates the DOM no DOM on server

learning javascript running on server first THEN on the browser Server puts together an HTML document that it sends to the browser and then using this they talk to each other can't trust the browser. browser keeps no secrets any data sent to server has to be appropriately validated

Database is persistent data structure for servers relational database

callbacks -> asynchronous I/O here is some code, do this when ... processes threads : start new thread heavier weight than you want not efficient