ryansmith3136

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].

ryansmith3136

#!/usr/bin/env sh
curl -lo beanstalkd.tar.gz "http://cloud.github.com/downloads/kr/beanstalkd/beanstalkd-1.4.6.tar.gz"
tar xvzf beanstalkd.tar.gz
cd beanstalkd-1.4.6/
./configure
make
python -m SimpleHTTPServer $PORT

ryansmith3136

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);

ryansmith3136

# 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.

ryansmith3136

# 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'

ryansmith3136

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

ryansmith3136

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

ryansmith3136

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

ryansmith3136

module Memstat
  extend self

  def puts
    "memory=#{real_mem_size} ruby_objects=#{num_objects}"
  end

  def real_mem_size
    mb = `ps -o rsz #{$$}`.split("\n")[1].to_f / 1024.0
    mb = mb.round(-2) # nearest 100 (i.e. 60.round(-2) == 100)

ryansmith3136

                                                           QUERY PLAN                                                           
--------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=21.03..21.04 rows=1 width=10) (actual time=0.063..0.063 rows=1 loops=1)
   ->  LockRows  (cost=21.03..21.11 rows=6 width=10) (actual time=0.062..0.062 rows=1 loops=1)
         ->  Sort  (cost=21.03..21.05 rows=6 width=10) (actual time=0.046..0.046 rows=1 loops=1)
               Sort Key: id
               Sort Method:  quicksort  Memory: 25kB
               ->  Seq Scan on queue_classic_jobs  (cost=0.00..21.00 rows=6 width=10) (actual time=0.035..0.036 rows=1 loops=1)
                     Filter: (locked_at IS NULL)
 Total runtime: 0.105 ms