Eran Medan eranation

Tech companies who have migrated to the JVM

NB: Does not include companies that started with a JVM language. The purpose of this gist is to list the companies that decided to move their stack (or some part of it) to the JVM.

Twitter (Ruby -> Scala) - http://www.readwriteweb.com/hack/2011/07/twitter-java-scala.php
Foursquare (PHP -> Scala) - http://www.scala-lang.org/node/5130
Facebook (PHP/C++ -> PHP on JVM) - http://nerds-central.blogspot.com.au/2012/08/facebook-moving-to-jvm.html
Tumblr (PHP -> Scala) - http://highscalability.com/blog/2012/2/13/tumblr-architecture-15-billion-page-views-a-month-and-harder.html
Square (Ruby -> Java/JRuby) - http://www.quora.com/Square-Inc-1/What-is-the-technology-stack-behind-Square

This article has been given a more permanent home on my blog. Also, since it was first written, the development of the Promises/A+ specification has made the original emphasis on Promises/A seem somewhat outdated.

You're Missing the Point of Promises

Promises are a software abstraction that makes working with asynchronous operations much more pleasant. In the most basic definition, your code will move from continuation-passing style:

getTweetsFor("domenic", function (err, results) {
 // the rest of your code goes here.

(tl;dr DOM builders like [domo][domo] trump HTML templates on the client.)

Like all web developers, I've used a lot of template engines. Like most, I've also written a few of them, some of which even [fit in a tweet][140].

The first open-source code I ever wrote was also one of the the first template engines for node.js, [a port][node-tmpl] of the mother of all JavaScript template engines, [John Resig][jresig]'s [micro-templates][tmpl]. Of course, these days you can't swing a dead cat without hitting a template engine; one in eight packages on npm ([2,220][npm templates] of 16,226 as of 10/19) involve templates.

John's implementation has since evolved and [lives on in Underscore.js][underscore], which means it's the default choice for templating in Backbone.js. And for a while, it's all I would ever use when building a client-side app.

But I can't really see the value in client-side HTML templates anymore.

	#!/usr/bin/python

	# Script to automate downloading CSV files from GoogleDocs
	#
	# Expects a config file in the same folder called google_docs_to_file.cfg
	# with the following format:
	#
	# [google_credentials]
	# email = [email protected]
	# password = *********

	#!/bin/bash
	# License: Public Domain.
	# Author: Joseph Wecker, 2012
	#
	# -- DEPRICATED --
	# This gist is slow and is missing .bashrc_once
	# Use the one in the repo instead! https://github.com/josephwecker/bashrc_dispatch
	# (Thanks gioele)
	#
	# Are you tired of trying to remember what .bashrc does vs .bash_profile vs .profile?

	//Export Chrome bookmarks as html
	//Manually add a id="target" to the <d1> under the <h3> of the folder you want to import

	//Initialize your list
	var list = '';

	//save the children of your target
	var target = document.getElementById('target').children;

	//grab all the titles and links, format them for easy importation to Kippt API

	#
	# Domain Validator by Frank Rietta
	# (C) 2012 Rietta Inc. All Rights Reserved.
	# Licensed under terms of the BSD License.
	#
	# To use in a validation, add something like this to your model:
	#
	# validates :name, :domain => true
	#
	class DomainValidator < ActiveModel::EachValidator

	package pivot

	class Pivot(val rows: List[List[String]]) {

	val headers = rows.head.zipWithIndex.map(_.swap)
	val body = rows.tail

	def addCalcCol(f: List[String] => String)(newColName: String) : Pivot = {
	val newRows = (headers.map(_._2) :+ newColName) +:
	body.map(row => { row :+ f(row)})

	//equivalent of "select count (distinct fieldName) from someTable"
	db.someCollection.aggregate([{ $group: { _id: "$fieldName"} },{ $group: { _id: 1, count: { $sum: 1 } } } ])

	// simple example of the cake pattern

	// abstract DAO trait
	trait Repository[A, B]{
	// saves an entity, returns an ID
	def save(entity: A): B
	// more features..
	}

	trait RdbmsRepository extends Repository[MyUserCaseClass, Long]{