gistfile1.rb

require "dbus"
require "notify"
require "thread"
Thread.abort_on_exception = true

def notify(msg)
  puts msg
  Notify.notify msg, ""
end

class ThirtyThirty < DBus::Object
  @mode = "work"

  def currentMode
    notify @mode
  end

  def changeMode
    if @mode == "work"
      @mode = "play"
      
    else
      @mode = "work"
    end
    notify @mode
  end

  def resetTime
    @time = Time.now
  end

  def getTime
    notify (30 - ((Time.now - @time).round) / 60).to_s + " minutes left"
  end

  dbus_interface "org.ruby.ThirtyThirty" do
    dbus_method :currentMode do
      currentMode()
    end

    dbus_method :changeMode do
      changeMode()
    end

    dbus_method :getTime do
      getTime()
    end
  end
end

bus = DBus::SessionBus.instance
service = bus.request_service("org.ruby.ThirtyThirty")
exported_obj = ThirtyThirty.new("/org/ruby/ThirtyThirty")
service.export(exported_obj)

Thread.new do
  loop do
    exported_obj.resetTime
    exported_obj.changeMode
    sleep 60 * 30
  end
end

puts "listening"
main = DBus::Main.new
main << bus
main.run

gistfile2.rb

require 'dbus'

bus = DBus::SessionBus.instance
service = bus.service("org.ruby.ThirtyThirty")
obj = service.object("/org/ruby/ThirtyThirty")
obj.introspect
obj.default_iface = "org.ruby.ThirtyThirty"
puts obj.getTime()