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#ifndef __TSingletonImpl_h__
#define __TSingletonImpl_h__ 1
// =================================================================================================
// Copyright Adobe
// Copyright 2014 Adobe
// All Rights Reserved
//
// NOTICE: Adobe permits you to use, modify, and distribute this file in accordance with the terms
// of the Adobe license agreement accompanying it.
// =================================================================================================
#include "XMPCommon/XMPCommonDefines_I.h"
#include <stdexcept>
#include <cstdlib>
namespace AdobeXMPCommon_Int {
template< typename T >
class TSingleThreaded {
public:
typedef T VolatileType;
protected:
inline explicit TSingleThreaded() {}
inline ~TSingleThreaded() {}
protected:
class LockThread {
public:
inline explicit LockThread() {
TSingleThreaded::Lock();
}
inline ~LockThread() {
TSingleThreaded::Unlock();
}
private:
inline explicit LockThread( const LockThread & ) {}
inline LockThread & operator=( const LockThread & ) { return *this; }
};
private:
friend class LockThread;
inline static void Lock() {}
inline static void Unlock() {}
private:
inline explicit TSingleThreaded( const TSingleThreaded & ) {}
inline TSingleThreaded & operator=( const TSingleThreaded & ) { return *this; }
};
template< typename T >
class TDefaultLifetime;
template< typename T >
class TInitTermiateControlledLifeTime;
template< typename T >
class TCreateUsingNew;
template< typename T, typename CreationPolicy = TCreateUsingNew<T>,
template < typename > class LifetimePolicy = TInitTermiateControlledLifeTime,
template < typename > class ThreadingModel = TSingleThreaded >
class TSingleton
: public CreationPolicy,
public LifetimePolicy<T>,
public ThreadingModel<T>
{
public:
typedef T & reference;
typedef T * pointer;
static reference Instance() {
if ( TSingleton::mInstance == 0 ) {
typename ThreadingModel<T>::LockThread lock;
if ( TSingleton::mInstance == 0 ) {
if ( TSingleton::mDestroyed ) {
LifetimePolicy<T>::OnDeadReference();
TSingleton::mDestroyed = false;
}
TSingleton::mInstance = CreationPolicy::CreateInstance();
try {
LifetimePolicy<T>::ScheduleForDestruction( TSingleton::Destroy );
} catch( ... ) {
CreationPolicy::DestroyInstance( TSingleton::mInstance );
}
}
}
return *(TSingleton::mInstance);
}
static void Destroy();
protected:
inline explicit TSingleton() {
assert(TSingleton::mInstance == 0);
TSingleton::mInstance = static_cast< pointer >( this );
TSingleton::mDestroyed = false;
}
inline ~TSingleton() {
TSingleton::mInstance = 0;
TSingleton::mDestroyed = true;
}
private:
static pointer mInstance;
static bool mDestroyed;
private:
inline explicit TSingleton( const TSingleton & ) {}
inline TSingleton & operator=( const TSingleton & ) { return *this; }
};
template< typename Ty, typename C, template < typename > class L, template < typename > class T >
void TSingleton< Ty, C, L, T >::Destroy() {
if ( TSingleton::mInstance != 0 ) {
typename T<Ty>::LockThread lock;
if ( TSingleton::mInstance != 0 ) {
C::DestroyInstance(TSingleton::mInstance);
TSingleton::mInstance = 0;
TSingleton::mDestroyed = true;
}
}
}
template< typename Ty, typename C, template < typename > class L, template < typename > class T >
typename TSingleton<Ty, C, L, T>::pointer TSingleton<Ty, C, L, T>::mInstance = 0;
//typename TSingleton<Ty, C, L, T>::template T<Ty>::VolatileType * TSingleton<Ty, C, L, T>::mInstance = 0;
template< typename Ty, typename C, template < typename > class L, template < typename > class T >
bool TSingleton<Ty, C, L, T>::mDestroyed = false;
template< typename T >
class TDefaultLifetime {
protected:
inline explicit TDefaultLifetime() {}
inline ~TDefaultLifetime() {}
inline static void OnDeadReference() {
throw std::logic_error("Dead Reference Detected");
}
inline static void ScheduleForDestruction(void (*pFun)()) {
std::atexit(pFun);
}
private:
inline explicit TDefaultLifetime( const TDefaultLifetime & ) {}
inline TDefaultLifetime & operator=( const TDefaultLifetime & ) { return *this; }
};
template< typename T >
class TCreateUsingNew {
public:
typedef T * pointer;
protected :
inline explicit TCreateUsingNew() {}
inline ~TCreateUsingNew() {}
inline static pointer CreateInstance() { return new T(); }
inline static void DestroyInstance(pointer t) { delete t; }
private :
inline explicit TCreateUsingNew( const TCreateUsingNew & ) {}
inline TCreateUsingNew & operator=( const TCreateUsingNew & ) { return *this; }
};
template< typename T >
class TInitTermiateControlledLifeTime {
protected:
inline explicit TInitTermiateControlledLifeTime() {}
inline ~TInitTermiateControlledLifeTime() {}
inline static void OnDeadReference() {
//do nothing
}
inline static void ScheduleForDestruction(void (*pFun)()) {
}
private:
inline explicit TInitTermiateControlledLifeTime( const TDefaultLifetime< T > & ) {}
inline TInitTermiateControlledLifeTime & operator=( const TDefaultLifetime< T > & ) { return *this; }
};
}
#endif // __TSingletonImpl_h__
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