Chanaka Abeysinghe chanakasan

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Dependency Injection in Ruby 07 Oct 04

Introduction

At the 2004 Ruby Conference, Jamis Buck had the unenviable task to explain Dependency Injection to a bunch of Ruby developers. First of all, Dependency Injection (DI) and Inversion of Control (IoC) is hard to explain, the benefits are subtle and the dynamic nature of Ruby make those benefits even more marginal. Furthermore examples using DI/IoC are either too simple (and don’t convey the usefulness) or too complex (and difficult to explain in the space of an article or presentation). I once attempted to explain DI/IoC to a room of Java programmers (see onestepback.org/articles/dependencyinjection/), so I can’t pass up trying to explain it to Ruby developers.

Thanks goes to Jamis Buck (the author of the Copland DI/IoC framework) who took the time to review this article and provide feedback.

What is Dependency Injection?

Multiple PHP versions using `phpenv` and `php-build`

Install dependecies

Debian/Ubuntu users

sudo apt install \
  autoconf \
  bison \

	<!DOCTYPE html>
	<html ng-app="App">
	<head>
	<meta name="description" content="AngularJS + jQuery UI Drag-n-Drop" />
	<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
	<script src="http://cdnjs.cloudflare.com/ajax/libs/angular.js/1.0.1/angular.min.js"></script>
	<link href="http://ajax.googleapis.com/ajax/libs/jqueryui/1/themes/base/jquery-ui.css" rel="stylesheet" type="text/css" />
	<link href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.1.1/css/bootstrap.min.css" rel="stylesheet">
	<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1/jquery-ui.min.js"></script>
	<meta charset=utf-8 />

	class TasksController < ApplicationController
	def update
	tracker = TaskTracker.new(@task)
	if @task.update_attributes(params[:task])
	TaskPusher.new(tracker, socket_id).push_changes
	TaskMailSender.new(tracker, current_user).deliver_email
	# success response
	else
	# failure respond
	end

	<?php
	trait MetaClass
	{
	protected $__classMethods = array();

	static protected $__staticMethods = array();


	public function __call($name, $args)
	{

	module Constraint
	class Staff

	def matches?(request)
	warden(request).authenticated? &&
	warden(request).user.staff?
	end

	private

	RSpec.configure do \|config\|
	config.before(:suite) do
	DatabaseCleaner.clean_with(:truncation)
	end

	config.before(:each) do
	DatabaseCleaner.strategy = :transaction
	end

	config.before(:each, js: true) do

	/*
	* Selenium WebDriver JavaScript test with Mocha and NodeJS
	*
	* Start with: SELENIUM=PATH_TO_SELENIUM_JAR/selenium-server-standalone-2.31.0.jar mocha -t 10000 -R list google-sample.js
	*
	* Download selenium-server-standalone-2.31.0.jar from https://selenium.googlecode.com/files/selenium-server-standalone-2.31.0.jar
	* 'sudo su' and 'npm install -g colors mocha selenium-webdriver'
	*
	* http://visionmedia.github.io/mocha/
	* https://code.google.com/p/selenium/wiki/WebDriverJs

	// Don't care much about inheritance at this point, but I'll probably attempt it at
	// some point via cloning ancestor schema's

	var mongoose = require('mongoose'),
	Schema = mongoose.Schema;

	var Contact = new Schema({
	_type: String,
	name: String
	});