Abstract Factory pattern 은 Factory:::pattern(:12)를 추상화 시킨 패턴이다. 즉 구체적인 클래스의 정의를 하지 않고, 인터페이스만 제공하게 함으로써 실제 구현은 상속된 클래스를 통해서 이루어지게 한다.
추상화 시키는 이유는 concrete Create의 종류가 많아지게 될 경우 애플리케이션의 코드 수정이 불가피해 질 수 있다는 Factory pattern의 단점을 보완하기 위함이다.
구조
예제 1
#include <iostream>
using namespace std;
#define DEFAULT 0
#define GET 1
#define PUT 2
/* Interface */
class Handler
{
public:
virtual void execute(char *instr)=0;
virtual int getID()=0;
};
/* Factory Class */
class HandlerFactory
{
public:
Handler *instance(){}
};
class GetHandler : public Handler
{
public :
void execute(char *str)
{
cout << "Get Handler : " << str << endl;
}
int getID(){return GET;}
};
class PutHandler : public Handler
{
public :
void execute(char *str)
{
cout << "Put Handler : " << str << endl;
}
int getID(){return PUT;}
};
class DefaultHandler : public Handler
{
public :
void execute(char *str)
{
cout << "DefaultHandler : " << str << endl;
}
int getID(){return DEFAULT;}
};
class GetDataHandler : public HandlerFactory
{
public :
Handler * instance(int type)
{
if (type == GET)
return new GetHandler;
if (type == PUT)
return new PutHandler;
return new DefaultHandler;
}
};
int main()
{
GetDataHandler *dh = new GetDataHandler;
Handler *mh = dh->instance(PUT);
mh->execute((char *)"ok");
cout << "ID : " << mh->getID() << endl;
}
예제 2
#include <iostream>
using namespace std;
class Lock
{
public:
virtual void lock()=0;
virtual void unlock()=0;
};
class LockFactory
{
public:
Lock *getInstance(int type);
};
class FileLock : public Lock
{
public:
void lock(){cout << "File Record LOCK " << endl;}
void unlock(){cout << "File Record UN Lock " << endl;}
};
class MutexLock : public Lock
{
public:
void lock(){cout << "Mutex LOCK " << endl;}
void unlock(){cout << "Mutex UN Lock " << endl;}
};
class DefaultLock : public Lock
{
public:
void lock(){cout << "LOCK " << endl;}
void unlock(){cout << "UN Lock " << endl;}
};
class GetLockHandler : public LockFactory
{
public:
Lock *gethandler(int type)
{
if (type == 1)
{
return new MutexLock;
}
if (type == 2)
{
return new FileLock;
}
return new DefaultLock;
}
};
int main(int argc, char ** argv)
{
GetLockHandler *LockHandler = new GetLockHandler;
Lock *myLock = LockHandler->gethandler(2);
myLock->lock();
myLock->unlock();
return 0;
}
Abstract Factory pattern
구조
예제 1
#include <iostream> using namespace std; #define DEFAULT 0 #define GET 1 #define PUT 2 /* Interface */ class Handler { public: virtual void execute(char *instr)=0; virtual int getID()=0; }; /* Factory Class */ class HandlerFactory { public: Handler *instance(){} }; class GetHandler : public Handler { public : void execute(char *str) { cout << "Get Handler : " << str << endl; } int getID(){return GET;} }; class PutHandler : public Handler { public : void execute(char *str) { cout << "Put Handler : " << str << endl; } int getID(){return PUT;} }; class DefaultHandler : public Handler { public : void execute(char *str) { cout << "DefaultHandler : " << str << endl; } int getID(){return DEFAULT;} }; class GetDataHandler : public HandlerFactory { public : Handler * instance(int type) { if (type == GET) return new GetHandler; if (type == PUT) return new PutHandler; return new DefaultHandler; } }; int main() { GetDataHandler *dh = new GetDataHandler; Handler *mh = dh->instance(PUT); mh->execute((char *)"ok"); cout << "ID : " << mh->getID() << endl; }예제 2
#include <iostream> using namespace std; class Lock { public: virtual void lock()=0; virtual void unlock()=0; }; class LockFactory { public: Lock *getInstance(int type); }; class FileLock : public Lock { public: void lock(){cout << "File Record LOCK " << endl;} void unlock(){cout << "File Record UN Lock " << endl;} }; class MutexLock : public Lock { public: void lock(){cout << "Mutex LOCK " << endl;} void unlock(){cout << "Mutex UN Lock " << endl;} }; class DefaultLock : public Lock { public: void lock(){cout << "LOCK " << endl;} void unlock(){cout << "UN Lock " << endl;} }; class GetLockHandler : public LockFactory { public: Lock *gethandler(int type) { if (type == 1) { return new MutexLock; } if (type == 2) { return new FileLock; } return new DefaultLock; } }; int main(int argc, char ** argv) { GetLockHandler *LockHandler = new GetLockHandler; Lock *myLock = LockHandler->gethandler(2); myLock->lock(); myLock->unlock(); return 0; }Recent Posts
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