Action deliver

appointment_cancelation_delivery.rb

class Deliveries::AppointmentCancelationDelivery < Deliveries::Delivery
  protected
    def notification
      AppointmentNotifier.canceled(recipient)
    end

    def mail
      AppointmentMailer.canceled(deliverable, recipient)
    end
end

delivery.rb

class Deliveries::Delivery
  extend Suppressible

  def initialize(deliverable, recipient)
    @deliverable, @recipient = deliverable, recipient
  end

  def self.deliver(deliverable, recipient)
    new(deliverable, recipient).deliver
  end

  def deliver
    return if suppressed?

    notification.try :notify_later
    mail.try :deliver_later
  end

  private
    attr_reader :deliverable, :recipient

    def suppressed?
      Deliveries::Delivery.suppressed?
    end

    def notification
      # Must be implemented in concrete subclass
    end

    def mail
      # Must be implemented in concrete subclass
    end
end

Gemfile

gem "abstract_notifier"

suppressible.rb

module Suppressible
  def self.extended(base)
    base.thread_mattr_accessor :suppressed, instance_accessor: false
    base.delegate :suppressed?, to: "self.class"
  end

  def suppress(&block)
    original, self.suppressed = self.suppressed, true
    yield
  ensure
    self.suppressed = original
  end

  def suppressed?
    suppressed
  end
end