Паттерн Facade (фасад)

#include <iostream.h>

class MisDepartment
{
  public:
    void submitNetworkRequest()
    {
        _state = 0;
    }
    bool checkOnStatus()
    {
        _state++;
        if (_state == Complete)
          return 1;
        return 0;
    }
  private:
    enum States
    {
        Received, DenyAllKnowledge, ReferClientToFacilities,
        FacilitiesHasNotSentPaperwork, ElectricianIsNotDone,
        ElectricianDidItWrong, DispatchTechnician, SignedOff, 
        DoesNotWork, FixElectriciansWiring, Complete
    };
    int _state;
};

class ElectricianUnion
{
  public:
    void submitNetworkRequest()
    {
        _state = 0;
    }
    bool checkOnStatus()
    {
        _state++;
        if (_state == Complete)
          return 1;
        return 0;
    }
  private:
    enum States
    {
        Received, RejectTheForm, SizeTheJob, SmokeAndJokeBreak,
        WaitForAuthorization, DoTheWrongJob, BlameTheEngineer, 
        WaitToPunchOut, DoHalfAJob, ComplainToEngineer, 
        GetClarification, CompleteTheJob, TurnInThePaperwork, 
        Complete
    };
    int _state;
};

class FacilitiesDepartment
{
  public:
    void submitNetworkRequest()
    {
        _state = 0;
    }
    bool checkOnStatus()
    {
        _state++;
        if (_state == Complete)
          return 1;
        return 0;
    }
  private:
    enum States
    {
        Received, AssignToEngineer, EngineerResearches, 
        RequestIsNotPossible, EngineerLeavesCompany, 
        AssignToNewEngineer, NewEngineerResearches,
        ReassignEngineer,EngineerReturns, 
        EngineerResearchesAgain, EngineerFillsOutPaperWork, 
        Complete
    };
    int _state;
};

class FacilitiesFacade
{
  public:
    FacilitiesFacade()
    {
        _count = 0;
    }
    void submitNetworkRequest()
    {
        _state = 0;
    }
    bool checkOnStatus()
    {
        _count++;
        /* Запрос на обслуживание получен */
        if (_state == Received)
        {
            _state++;
            /* Перенаправим запрос инженеру */
            _engineer.submitNetworkRequest();
            cout << "submitted to Facilities - " << _count 
                 << " phone calls so far" << endl;
        }
        else if (_state == SubmitToEngineer)
        {
            /* Если инженер свою работу выполнил, 
               перенаправим запрос электрику */
            if (_engineer.checkOnStatus())
            {
                _state++;
                _electrician.submitNetworkRequest();
                cout << "submitted to Electrician - " << _count 
                     << " phone calls so far" << endl;
            }
        }
        else if (_state == SubmitToElectrician)
        {
            /* Если электрик свою работу выполнил, 
               перенаправим запрос технику */
            if (_electrician.checkOnStatus())
            {
                _state++;
                _technician.submitNetworkRequest();
                cout << "submitted to MIS - " << _count 
                     << " phone calls so far" << endl;
            }
        }
        else if (_state == SubmitToTechnician)
        {
            /* Если техник свою работу выполнил, 
               то запрос обслужен до конца */
            if (_technician.checkOnStatus())
              return 1;
        }
        /* Запрос еще не обслужен до конца */
        return 0;
    }
    int getNumberOfCalls()

    {
        return _count;
    }
  private:
    enum States
    {
        Received, SubmitToEngineer, SubmitToElectrician, 
        SubmitToTechnician
    };
    int _state;
    int _count;
    FacilitiesDepartment _engineer;
    ElectricianUnion _electrician;
    MisDepartment _technician;
};

int main()
{
  FacilitiesFacade facilities;

  facilities.submitNetworkRequest();
  /* Звоним, пока работа не выполнена полностью */
  while (!facilities.checkOnStatus())
    ;
  cout << "job completed after only " 
       << facilities.getNumberOfCalls()
       << " phone calls" << endl;
}

submitted to Facilities - 1 phone calls so far
submitted to Electrician - 12 phone calls so far
submitted to MIS - 25 phone calls so far
job completed after only 35 phone calls