app/models/action.rb

	action.rb revision 8a47d4bfed6d65a0a0826f22f3541962464c6a05
class Action < ActiveRecord::Base
  TERMINAL_STATUSES = %w(done failed)

  belongs_to :resource, polymorphic: true

  attr_accessible :initial_eta, :resource

  def self.enclose!(initial_eta, klass, method, *args)
    action = create!(initial_eta: initial_eta)
    ActionWorker.perform_async(action.id, klass.to_s, method, *args)
    action
  end

  def eta(time = Time.now)
    diff = (action_started_at + initial_eta) - time
    [diff, 0].max
  end

  def status
    if resource.nil?
      'waiting'
    elsif resource.respond_to?(:state)
      resource.state
    elsif resource.respond_to?(:status)
      resource.status
    else
      raise NoMethodError, "resource does know neither state nor status."
    end
  end

  def ready?
    if resource.respond_to?(:ready?)
      resource.ready?
    else
      TERMINAL_STATUSES.include?(status.to_s)
    end
  end

  def action_started_at
    read_attribute(:action_started_at) || created_at
  end

  def register_start_of_action
    touch(:action_started_at)
  end
end