4.2 Quartz aalto course

4_2_quartz.rb

# config.ru
class SimpleApp
  def self.call(env)
    request = Rack::Request.new(env)
    case request.path_info
    when '/'
      latency = Random.rand(0.05..5)
      p "I'm lazy, my laziness is #{latency} seconds..."
      sleep(latency)
      [200, {"content-type" => "text/plain"}, ["Hello, World! Server latency is #{latency} s"]]
    when '/exhaust'
      exhaust_resources
    when '/sleep'
      sleep_forever
    else
      [404, {"content-type" => "text/plain"}, ["Not Found"]]
    end
  end

  def self.sleep_forever
    loop do
      sleep(1000) # actually its around 16 minutes.
    end
  end
  
  def self.exhaust_resources
    large_array = Array.new(1_000_000) { Array.new(1000) { rand(1000) } }
    [200, {"content-type" => "text/plain"}, ["Exhausted Resources"]]
  end
end

run SimpleApp

# client.rb
require 'net/http'
require 'uri'

path = ARGV.length > 0 ? ARGV[0] : ''
uri = URI.parse("http://localhost:4567/#{path}")
response = Net::HTTP.get_response(uri)

puts response.body

# Usage:
# run server `rackup -p 4567`
# run client cases:
# `ruby client.rb`
# `ruby client.rb foo`
# `ruby client.rb sleep`
# `ruby client.rb exhaust`