igorsokolov

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

igorsokolov

db.createUser(
    {
      user: "<username>",
      pwd: "<password>",
      roles: [ { "role" : "readWrite", "db" : "<database_name>" } ]
    }
)

igorsokolov

#!/usr/bin/ruby

require 'optparse'
require 'ostruct'
require 'fileutils'
require 'pathname'
require 'tmpdir'

$script_path = File.expand_path(File.dirname(__FILE__))
$temp_path = Dir.mktmpdir

igorsokolov

Ruby Debugger

Most of the time simple output statements using warn, raise, or a logger will help you find your issue. But sometimes you need the big guns, and that means ruby-debug.

Ruby-Debug

The ruby-debug package has had some rocky times during the transition from Ruby 1.8.7 to 1.9.2 and beyond. But now, finally, the debugger is reliable and usable.

Installation

igorsokolov

Bluepill.application("app", :base_dir => "#{RAILS_ROOT}/tmp/bluepill", :log_file => "#{RAILS_ROOT}/log/bluepill.log") do |app|
  app.process("unicorn") do |process|
    process.pid_file = File.join(RAILS_ROOT, 'tmp/pids/unicorn.pid')
    process.working_dir = RAILS_ROOT
  
    process.start_command = "unicorn -c config/unicorn.rb -E production config.ru"
    process.stop_command = "kill -QUIT {{PID}}"
    process.restart_command = "kill -USR2 {{PID}}"
  
    process.uid = process.gid = 'www'

igorsokolov

# unicorn_rails -c config/unicorn.rb -E production -D

working_directory File.join(File.dirname(File.expand_path(__FILE__)), '..')

rails_env = ENV['RAILS_ENV'] || 'production'

# 16 workers and 1 master
worker_processes (rails_env == 'production' ? 4 : 1)

stderr_path "log/unicorn.stderr.log"

igorsokolov

Failed to start bluepill:
TypeError `no marshal_dump is defined for class Mutex`
/Users/skip/.bundle/ruby/1.9.1/gems/bluepill-0.0.38/lib/bluepill/process.rb:381:in `dump'
/Users/skip/.bundle/ruby/1.9.1/gems/bluepill-0.0.38/lib/bluepill/process.rb:381:in `deep_copy'
/Users/skip/.bundle/ruby/1.9.1/gems/bluepill-0.0.38/lib/bluepill/process.rb:367:in `block in refresh_children!'
/Users/skip/.bundle/ruby/1.9.1/gems/bluepill-0.0.38/lib/bluepill/process.rb:366:in `each'
/Users/skip/.bundle/ruby/1.9.1/gems/bluepill-0.0.38/lib/bluepill/process.rb:366:in `refresh_children!'
/Users/skip/.bundle/ruby/1.9.1/gems/bluepill-0.0.38/lib/bluepill/process.rb:122:in `tick'
/Users/skip/.bundle/ruby/1.9.1/gems/bluepill-0.0.38/lib/bluepill/group.rb:19:in `block in tick'
/Users/skip/.bundle/ruby/1.9.1/gems/bluepill-0.0.38/lib/bluepill/group.rb:18:in `each'