Facade pattern

The facade pattern (also spelled façade) is a software design pattern commonly used with object-oriented programming. The name is an analogy to an architectural façade.

A facade is an object that provides a simplified interface to a larger body of code, such as a class library. A facade can

The Facade design pattern is often used when a system is very complex or difficult to understand because the system has a large number of interdependent classes or its source code is unavailable. This pattern hides the complexities of the larger system and provides a simpler interface to the client. It typically involves a single wrapper class that contains a set of members required by client. These members access the system on behalf of the facade client and hide the implementation details.

Usage

A Facade is used when an easier or simpler interface to an underlying object is desired.[1] Alternatively, an adapter can be used when the wrapper must respect a particular interface and must support polymorphic behavior. A decorator makes it possible to add or alter behavior of an interface at run-time.

Pattern Intent
Adapter Converts one interface to another so that it matches what the client is expecting
Decorator Dynamically adds responsibility to the interface by wrapping the original code
Facade Provides a simplified interface

The facade pattern is typically used when

Structure

Facade
The facade class abstracts Packages 1, 2, and 3 from the rest of the application.
Clients
The objects are using the Facade Pattern to access resources from the Packages.

Example

This is an abstract example of how a client ("you") interacts with a facade (the "computer") to a complex system (internal computer parts, like CPU and HardDrive).

C#

Implementation 

namespace DesignPattern.Facade
{
    class SubsystemA
    {
        public string OperationA1()
        {
            return "Subsystem A, Method A1\n";
        }
        public string OperationA2()
        {
            return "Subsystem A, Method A2\n";
        }
    }

    class SubsystemB
    {
        public string OperationB1()
        {
            return "Subsystem B, Method B1\n";
        }

        public string OperationB2()
        {
            return "Subsystem B, Method B2\n";
        }
    }

    class SubsystemC
    {
        public string OperationC1()
        {
            return "Subsystem C, Method C1\n";
        }

        public string OperationC2()
        {
            return "Subsystem C, Method C2\n";
        }
    }

    public class Facade
    {
        private readonly SubsystemA a = new SubsystemA();
        private readonly SubsystemB b = new SubsystemB();
        private readonly SubsystemC c = new SubsystemC();
        public void Operation1()
        {
            Console.WriteLine("Operation 1\n" +
                a.OperationA1() +
                b.OperationB1() +
                c.OperationC1());
        }
        public void Operation2()
        {
            Console.WriteLine("Operation 2\n" +
                a.OperationA2() +
                b.OperationB2() +
                c.OperationC2());
        }
    }
}

Sample code 

namespace DesignPattern.Facade.Sample
{
    // The 'Subsystem ClassA' class
    class CarModel
    {
        public void SetModel()
        {
            Console.WriteLine(" CarModel - SetModel");
        }
    }

    /// <summary>
    /// The 'Subsystem ClassB' class
    /// </summary>
    class CarEngine
    {
        public void SetEngine()
        {
            Console.WriteLine(" CarEngine - SetEngine");
        }
    }

    // The 'Subsystem ClassC' class
    class CarBody
    {
        public void SetBody()
        {
            Console.WriteLine(" CarBody - SetBody");
        }
    }

    // The 'Subsystem ClassD' class
    class CarAccessories
    {
        public void SetAccessories()
        {
            Console.WriteLine(" CarAccessories - SetAccessories");
        }
    }

    // The 'Facade' class
    public class CarFacade
    {
        private readonly CarAccessories accessories;
        private readonly CarBody body;
        private readonly CarEngine engine;
        private readonly CarModel model;

        public CarFacade()
        {
            accessories = new CarAccessories();
            body = new CarBody();
            engine = new CarEngine();
            model = new CarModel();
        }

        public void CreateCompleteCar()
        {
            Console.WriteLine("******** Creating a Car **********");
            model.SetModel();
            engine.SetEngine();
            body.SetBody();
            accessories.SetAccessories();

            Console.WriteLine("******** Car creation is completed. **********");
        }
    }

    // Facade pattern demo
    class Program
    {
        static void Main(string[] args)
        {
            var facade = new CarFacade();

            facade.CreateCompleteCar();

            Console.ReadKey();
        }
    }
}

Java 

/* Complex parts */

class CPU {
    public void freeze() { ... }
    public void jump(long position) { ... }
    public void execute() { ... }
}

class HardDrive {
    public byte[] read(long lba, int size) { ... }
}

class Memory {
    public void load(long position, byte[] data) { ... }
}

/* Facade */

class ComputerFacade {
    private CPU processor;
    private Memory ram;
    private HardDrive hd;

    public ComputerFacade() {
        this.processor = new CPU();
        this.ram = new Memory();
        this.hd = new HardDrive();
    }

    public void start() {
        processor.freeze();
        ram.load(BOOT_ADDRESS, hd.read(BOOT_SECTOR, SECTOR_SIZE));
        processor.jump(BOOT_ADDRESS);
        processor.execute();
    }
}

/* Client */

class You {
    public static void main(String[] args) {
        ComputerFacade computer = new ComputerFacade();
        computer.start();
    }
}

Ruby

# Complex Parts
class CPU
  def freeze; end
  def jump(position); end
  def execute; end
end

class Memory
  def load(position, data); end
end

class HardDrive
  def read(lba, size); end
end

# Facade
class ComputerFacade

  def initialize
    @processor = CPU.new
    @ram = Memory.new
    @hd = HardDrive.new
  end

  def start
    @processor.freeze
    @ram.load(BOOT_ADDRESS, @hd.read(BOOT_SECTOR, SECTOR_SIZE))
    @processor.jump(BOOT_ADDRESS)
    @processor.execute
  end
end

# Client
computer_facade = ComputerFacade.new
computer_facade.start

PHP

/**
 * The complicated, underlying logic.
 */
class CPU
{
  public function freeze() {/* ... */}
  public function jump($position) {/* ... */}
  public function execute() {/* ... */}
}

class Memory
{
  public function load($position, $data) {/* ... */}
}

class HardDrive
{
  public function read($lba, $size) {/* ... */}
}

/**
 * The facade that users would be interacting with.
 */
class ComputerFacade
{
  protected $cpu;
  protected $memory;
  protected $hd;

  public function __construct()
  {
    $this->cpu = new CPU;
    $this->ram = new Memory;
    $this->hd = new HardDrive;
  }

  public function start()
  {
    $this->cpu->start();
    $this->ram->load(BOOT_ADDRESS, $this->hd->read(BOOT_SECTOR, SECTOR_SIZE));
    $this->cpu->jump(BOOT_ADDRESS);
    $this->cpu->execute();
  }
}

/**
 * How a user could start the computer.
 */
$computer = new ComputerFacade;
$computer->start();

Python

"""
Facade pattern example.
"""

# Complex computer parts
class CPU(object):
    """
    Simple CPU representation.
    """
    def freeze(self):
        print("Freezing processor.")

    def jump(self, position):
        print("Jumping to:", position)

    def execute(self):
        print("Executing.")


class Memory(object):
    """
    Simple memory representation.
    """
    def load(self, position, data):
        print("Loading from {0} data: '{1}'.".format(position, data))


class SolidStateDrive(object):
    """
    Simple solid state drive representation.
    """
    def read(self, lba, size):
        return "Some data from sector {0} with size {1}".format(lba, size)


class ComputerFacade(object):
    """
    Represents a facade for varius computer parts.
    """
    def __init__(self):
        self.cpu = CPU()
        self.memory = Memory()
        self.ssd = SolidStateDrive()

    def start(self):
        self.cpu.freeze()
        self.memory.load("0x00", self.ssd.read("100", "1024"))
        self.cpu.jump("0x00")
        self.cpu.execute


computer_facade = ComputerFacade()
computer_facade.start()

Output:

Freezing processor.
Loading from 0x00 data: 'Some data from sector 100 with size 1024'.
Jumping to: 0x00

References

  1. ↑ Freeman, Eric; Freeman, Elisabeth; Sierra, Kathy; Bates, Bert (2004). Hendrickson, Mike; Loukides, Mike, eds. "Head First Design Patterns" (paperback). 1. O'Reilly: 243, 252, 258, 260. ISBN 978-0-596-00712-6. Retrieved 2012-07-02.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.