You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: wait_for_communicator.rb
    path of file: ./repos/vagrant/lib/vagrant/action/builtin
    
    the code of the file until where you have to start completion: # Copyright (c) HashiCorp, Inc.
# SPDX-License-Identifier: BUSL-1.1

module Vagrant
  module Action
    module Builtin
      # This waits for the communicator to be ready for a set amount of
      # time.
      class WaitForCommunicator
        def initialize(app, env, states=nil)
          @app    = app
          @states = states
        end

        def call(env)
          # Wait for ready in a thread so that we can continually check
          # for interrupts.
          ready_thr = Thread.new do
            Thread.current[:result] = env[:machine].communicate.wait_for_ready(
              env[:machine].config.vm.boot_timeout)
          end

          # Start a thread that verifies the VM stays in a good state.
          states_thr = Thread.new do
            Thread.current[:result] = true

            # Otherwise
    
        def call(env)
          # Wait for ready in a thread so that we can continually check
          # for interrupts.
          ready_thr = Thread.new do
            Thread.current[:result] = env[:machine].communicate.wait_for_ready(
              env[:machine].config.vm.boot_timeout)
          end

          # Start a thread that verifies the VM stays in a good state.
          states_thr = Thread.new do
            Thread.current[:result] = true

            # Otherwise, periodically verify the VM isn't in a bad state.
            while true
              state = env[:machine].state.id

              # Used to report invalid states
              Thread.current[:last_known_state] = state

              # Check if we have the proper state so we can break out
              if @states && !@states.include?(state)
                Thread.current[:result] = false
                break
              end

              # Sleep a bit so we don't hit 100% CPU constantly.
              sleep 1
            end
          end