lập trình NodeJS ppt

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Ngày đăng: 29/11/2016, 13:07

By: Michael Jhun Angelo Bea  A JavaScript runtime environment running Google Chrome’s V8 engine ◦ a.k.a a server-side solution for JS ◦ Compiles JS, making it really fast  Runs over the command line  Designed for high concurrency ◦ Without threads or new processes  Never blocks, not even for I/O  Uses the CommonJS framework ◦ Making it a little closer to a real OO language  JavaScript used in client-side but node.js puts the JavaScript on server-side thus making communication between client and server will happen in same language  Servers are normally thread based but Node.JS is “Event” based Node.JS serves each request in a Evented loop that can able to handle simultaneous requests  Node.JS programs are executed by V8 Javascript engine the same used by Google chrome browser "Node is similar in design to and influenced by systems like Ruby's event machine or Python's twisted Node takes the event model a bit further—it presents the event loop as a language construct instead of as a library."  Instead of threads Node uses an event loop with a stack  Alleviates overhead of context switching  Request for “index.html” comes in  Stack unwinds and ev_loop goes to sleep  File loads from disk and is sent to the client  Servers nothing but I/O ◦ Scripts waiting on I/O requests degrades performance  To avoid blocking, Node makes use of the event driven nature of JS by attaching callbacks to I/O requests  Scripts waiting on I/O waste no space because they get popped off the stack when their non-I/O related code finishes executing “The shorter the better!!!” Thanks for listening! 
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