Is promise concept available in ruby?

I'm Just wondering, is there a chaining concept in ruby.
I wanted to execute series of async tasks or methods one after the other. Is it possible?

You might want to create a process class, something like:

class MyProcess

  PROCESS_STEPS = %w(
    step_one
    step_two
    step_three
  )

  class << self 

    def next_step
      new.next_step
    end

  end # Class Methods

  #======================================================================
  # Instance Methods
  #======================================================================

    def next_step
      PROCESS_STEPS.each do |process_step|
        send(process_step) if send("do_#{process_step}?")
      end
    end

    def step_one
      # execute step one task
    end

    def do_step_one?
      # some logic
    end

    def step_two
      # execute step two task
    end

    def do_step_two?
      # some logic
    end

    def step_three
      # execute step three task
    end

    def do_step_three?
      # some logic
    end

end

You would probably put that in:

app 
 |- processes
 |   |- my_process.rb

Then, at the end of each task, do something like:

MyProcess.next_step