Ryan Smith ryandotsmith

A Backbone.js demo app (Sinatra Backend)

Oct 16 2010

Updates

04/10/2011 - Updated application.js and application.rb thanks to @rebo's comments

In this article, I will walk through some simple steps to get a [demo app][2] up and running with [Backbone.js][3] and [Sinatra][4] on [Heroku][5].

The Worker Pattern

Introduction

WIP

This document is still a work in process. Please email: [email protected] for ideas and contributions.

Financial Data Processing Model

The PAAS revolution has paved a way for a new class of internet business. Platform services like: Heroku, WebSolr & Joyent are breaking barriers for application developers by removing the burden of server management.

	module QC
	class Worker
	MAX_LOCK_ATTEMPTS = ENV["QC_MAX_LOCK_ATTEMPTS"] \|\| 5

	def initialize
	@running = true
	@queue = QC::Queue.new(ENV["QUEUE"])
	handle_signals
	end

	def lock_job
	attempts = 0
	job = nil
	until job
	job = @queue.dequeue
	if job.nil?
	attempts += 1
	if attempts < MAX_LOCK_ATTEMPTS
	sleep(2**attempts)
	next

	abacus.go

	Log Messages

	All of our production systems in The Vault have their
	STDOUT connected to Heroku's logplex. We also connect
	syslog draings to Logplex that outlet all messages to
	PaperTrailapp. Each system outputs two classes of
	messages. The first class of message is the system
	class. Messages of the system class are originated by

	# Streams of Data Part I
	## Logging Basics


	# We don't need anything complex here.
	# We will use the logger in the stdlib.
	# Rails.logger works fine here as well.
	# Using Rails.logger is prefered as you won't muck up
	# the screen when running tests.
	require 'logger'

	# Tab completion for tmux sessions.
	# Quickly open new tmux sessions in your projects dir.

	# Setup:
	# Source this code in your bash shell.
	# Update the code_dir var with the root directory of your source code.

	# Usage:

	# Use the tab to open an existing session.

	CREATE OR REPLACE FUNCTION last_day(timestamptz)
	RETURNS timestamptz AS
	$$
	SELECT (date_trunc('MONTH', $1) + INTERVAL '1 MONTH - 1 day');
	$$ LANGUAGE 'sql' IMMUTABLE STRICT;

	CREATE OR REPLACE FUNCTION first_day(timestamptz)
	RETURNS timestamptz AS
	$$
	SELECT date_trunc('MONTH', $1);