audreyt

From SocialCalc to EtherCalc

Previously, in The Architecture of Open Source Applications, I described SocialCalc, an in-browser spreadsheet system that replaced the server-centric WikiCalc architecture. SocialCalc performs all of its computations in the browser; it uses the server only for loading and saving spreadsheets.

For the Socialtext team, performance was the primary goal behind SocialCalc's design in 2006. The key observation was this: Client-side computation in JavaScript, while an order of magnitude slower than server-side computation in Perl, was still much faster than the network latency incurred during AJAX roundtrips:

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jaybill

package main

import "fmt"
import "os"
import "io"
import "io/ioutil"
import "log"

// Copies file source to destination dest.
func CopyFile(source string, dest string) (err error) {

moraes

package main

import (
	"fmt"
)

type Node struct {
	Value int
}

xjamundx

// middleware
app.use(express.bodyParser({ keepExtensions: true, uploadDir: __dirname + "/public/uploads" }))

// later
app.get('/photos', uploadFile, addPhoto)

// file is automatically saved to /public/uploads, let's just set 
function uploadFile(req, res, next) {
	if (req.files) {
		req.body.url = "http://myawesomesite.com/" + req.files.file.path.split("/").slice(-2).join("/")

tj

var express = require('express')
  , cookieSessions = require('./cookie-sessions');

var app = express();

app.use(express.cookieParser('manny is cool'));
app.use(cookieSessions('sid'));

app.get('/', function(req, res){
  req.session.count = req.session.count || 0;

fwielstra

/* The API controller
   Exports 3 methods:
   * post - Creates a new thread
   * list - Returns a list of threads
   * show - Displays a thread and its posts
*/


var Thread = require('../models/thread.js');
var Post = require('../models/post.js');

creationix

// Load the TCP Library
net = require('net');

// Keep track of the chat clients
var clients = [];

// Start a TCP Server
net.createServer(function (socket) {

  // Identify this client