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sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer

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hudson.util.IOException2: Slave JVM has not reported exit code. Is it still running?
	at hudson.plugins.sshslaves.SSHLauncher.startSlave(SSHLauncher.java:953)
	at hudson.plugins.sshslaves.SSHLauncher.access$400(SSHLauncher.java:133)
	at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:711)
	at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:696)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
	at java.util.concurrent.FutureTask.run(FutureTask.java:166)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:724)

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# models/instrument.rb
class Instrument
  attr_accessor :units

  def initialize(status, units)
    @status = status
    @units = units
  end

  def turn_on

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# models/hotel.rb
class Hotel
  attr_accessor :floors

  def initialize(num_floors, num_of_mc, num_of_sc, controller)
    @floors = []
    num_floors.times{ @floors << Floor.new(num_of_mc, num_of_sc) }
    controller.add_observer(self)
  end

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# models/floor.rb
class Floor
  attr_accessor :main_corridors
  attr_accessor :sub_corridors

  def initialize(num_of_mc, num_of_sc)
    @main_corridors = []
    @sub_corridors = []
    num_of_mc.times do
      mc = Corridor.new

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#models/corridor.rb
class Corridor
  attr_accessor :lights
  attr_accessor :air_conditioners

  def initialize
    @lights = [Instrument.new(STATUS_OFF, DEFAULT_UNITS_LIGHTS)]
    @air_conditioners = [Instrument.new(STATUS_OFF, DEFAULT_UNITS_AC)]
    @movement = false
  end

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#models/controller.rb
require 'observer'

class Controller
  include Observable

  attr_accessor :hotel

  def initialize(num_floors, num_of_mc, num_of_sc)
    @hotel = Hotel.new(num_floors, num_of_mc, num_of_sc, self)

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#init/constants.rb
STATUS_OFF = 'OFF'
STATUS_ON = 'ON'
DEFAULT_UNITS_LIGHTS = 5
DEFAULT_UNITS_AC = 10

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require 'pry'
Dir["./init/*.rb"].each {|file| require file }
Dir["./models/*.rb"].each {|file| require file }

print "Enter the number of Floors: "
floors = gets.chomp
print "Enter the number of Main Corridors: "
mc_per_floor = gets.chomp
print "Enter the number of Sub Corridors: "
sc_per_floor = gets.chomp

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#Usage: cap production db:load_from_remote

namespace :db do
  desc "Clones the dump from Production and loads to local database"
  task :load_from_remote do
    on roles(:app) do
      within current_path do
        with rails_env: fetch(:rails_env) do
          execute 'pg_dump --format=c mydb_production > /var/apps/my_project/shared/prod_db.dump'
        end