행위패턴-Mediator

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[Mediator]
의도:
객체들 간의 상호작용을 캡슐화하여 하나의 객체 안에 정의한다. Mediator 패턴은 각 객체가
관련성을 갖는 다른 객체에 대한 참조 관계를 직접 정의하기보다는 이를 독립된 다른 객체가
관리하게 한다.
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/////////////////////////////////////////////////////////////////////////////
//
// A Behavioral part of GoF's Design Patterns
//
// - Mediator
//
/////////////////////////////////////////////////////////////////////////////

#include <windows.h>
#include <tchar.h>

#include <iostream>
#include <memory>

/////////////////////////////////////////////////////////////////////////////
//
// Mediator
//
//
/////////////////////////////////////////////////////////////////////////////
class Colleague;

class Mediator
{
public:
 virtual ~Mediator () {}
public:
 virtual void OnNotify (Colleague *) {}
};

class Colleague
{
public:
 Colleague (Mediator* m) : Mediator_(m) {}
 virtual ~Colleague () {}
public:
 virtual void Notify ()
 {
  if (Mediator_)
  {
   Mediator_->OnNotify (this);
  }
 }

protected:
 Mediator* Mediator_;
};

////-------------------------------------------------------------------------

class ConcreteColleague1 : public Colleague
{
public:
 ConcreteColleague1 (Mediator* m) : Colleague (m) {}

public:
 void Act1 (void)
 {
  Notify ();
 }
};

class ConcreteColleague2 : public Colleague
{
public:
 ConcreteColleague2 (Mediator* m) : Colleague (m) {}

public:
 void Act2 (void)
 {
  Notify ();
 }
};

class ConcreteMediator : public Mediator
{
public:
 void Init (void)
 {
  Colleague1_.reset ( new ConcreteColleague1(this) );
  Colleague2_.reset ( new ConcreteColleague2(this) );
 }

 void Run (void)
 {
  Colleague1_->Act1 ();
  Colleague2_->Act2 ();
 }

 virtual void OnNotify (Colleague *c)
 {
  if      (c==Colleague1_.get())
  {
   std::cout << "ConcreteMediator::OnNotify() = Colleague1_" << std::endl;
  }
  else if (c==Colleague2_.get())
  {
   std::cout << "ConcreteMediator::OnNotify() = Colleague2_" << std::endl;
  }
 }

private:
 std::auto_ptr<ConcreteColleague1> Colleague1_;
 std::auto_ptr<ConcreteColleague2> Colleague2_;
};

/////////////////////////////////////////////////////////////////////////////
//
// Startup
//
//
/////////////////////////////////////////////////////////////////////////////
int _tmain(int argc, _TCHAR* argv[])
{
 ConcreteMediator mediator;

 mediator.Init ();
 mediator.Run  ();

 return 0;
}
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ConcreteMediator::OnNotify() = Colleague1_
ConcreteMediator::OnNotify() = Colleague2_