CODESAMPLE

Facade - Ruby

Facade Ruby

The Facade pattern provides a simplified interface to a complex subsystem. It defines a high-level interface that hides the intricacies of the underlying components, making the system easier to use. This example demonstrates a facade for ordering a pizza. The PizzaOrderFacade encapsulates the interactions with the PizzaMaker, PaymentProcessor, and DeliveryService subsystems. The client only needs to interact with the facade, hiding the complex order process. This implementation is idiomatic Ruby due to its use of clear method names, object-oriented structure, and the principle of “duck typing” allowing flexible interactions between the subsystems.

# pizza_maker.rb
class PizzaMaker
  def make_pizza(type, size)
    puts "Making a #{size} #{type} pizza..."
    "#{size} #{type} pizza"
  end
end

# payment_processor.rb
class PaymentProcessor
  def process_payment(amount, card_details)
    puts "Processing payment of $#{amount} with card details..."
    true # Simulate successful payment
  end
end

# delivery_service.rb
class DeliveryService
  def deliver_pizza(address, pizza)
    puts "Delivering #{pizza} to #{address}..."
    true # Simulate successful delivery
  end
end

# pizza_order_facade.rb
class PizzaOrderFacade
  def initialize(pizza_maker, payment_processor, delivery_service)
    @pizza_maker = pizza_maker
    @payment_processor = payment_processor
    @delivery_service = delivery_service
  end

  def order_pizza(type, size, address, card_details)
    pizza = @pizza_maker.make_pizza(type, size)
    if @payment_processor.process_payment(15.00, card_details)
      @delivery_service.deliver_pizza(address, pizza)
      puts "Pizza ordered successfully!"
    else
      puts "Payment failed. Pizza order cancelled."
    end
  end
end

# client.rb
pizza_maker = PizzaMaker.new
payment_processor = PaymentProcessor.new
delivery_service = DeliveryService.new
pizza_order = PizzaOrderFacade.new(pizza_maker, payment_processor, delivery_service)

pizza_order.order_pizza("Pepperoni", "Large", "123 Main St", "1234-5678-9012-3456")