facade pattern

facade pattern

1.소스

#include <iostream>

using namespace std;


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++;
        /* Job request has just been received */
        if (_state == Received)
        {
            _state++;
            /* Forward the job request to the engineer */
            _engineer.submitNetworkRequest();
            cout << "submitted to Facilities - " << _count << 
              " phone calls so far" << endl;
        }
        else if (_state == SubmitToEngineer)
        {
            /* If engineer is complete, forward to electrician */
            if (_engineer.checkOnStatus())
            {
                _state++;
                _electrician.submitNetworkRequest();
                cout << "submitted to Electrician - " << _count << 
                  " phone calls so far" << endl;
            }
        }
        else if (_state == SubmitToElectrician)
        {
            /* If electrician is complete, forward to technician */
            if (_electrician.checkOnStatus())
            {
                _state++;
                _technician.submitNetworkRequest();
                cout << "submitted to MIS - " << _count << 
                  " phone calls so far" << endl;
            }
        }
        else if (_state == SubmitToTechnician)
        {
            /* If technician is complete, job is done */
            if (_technician.checkOnStatus())
              return 1;
        }
        /* The job is not entirely complete */
        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();
  
    /* Keep checking until job is complete */
  
    while (!facilities.checkOnStatus());
    cout << "job completed after only " << facilities.getNumberOfCalls() << 
    " phone calls" << endl;
}

2.결과

g++ -o facade facade.cpp
hacker@HACKER:~/cpp$ ./facade
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