50 using Identifier =
const char*;
70 inline void increaseCounter()
76 virtual ~FuncWrapperBase();
79 template<
typename T,
typename ... Args>
80 class FuncWrapper final
81 :
public FuncWrapperBase
84 const std::function<
T(Args ...)> mFunc;
87 explicit FuncWrapper(std::function<
T(Args ...)> pFunc)
88 : mFunc(std::move(pFunc))
93 T operator()(Args&& ... pArgs)
96 return mFunc(pArgs ...);
102 using Wrapper = QSharedPointer<FuncWrapperBase>;
103 QList<Wrapper> mInstancesCreator;
104 QMap<Identifier, void*> mInstancesSingleton;
105 mutable QReadWriteLock mLock;
108 QPointer<QObjectCleanupHandler> mSingletonHandler;
109 QList<std::function<
void* (bool)>> mSingletonCreator;
111 QMap<Identifier, QWeakPointer<QObject>> mSharedInstances;
112 mutable QReadWriteLock mSharedInstancesLock;
114 static Env& getInstance();
119 Q_ASSERT(!mSingletonHandler.isNull());
121 if (!QCoreApplication::startingUp() && !QCoreApplication::applicationName().startsWith(QLatin1String(
"Test_")))
123 Q_ASSERT(QThread::currentThread()->objectName() == QLatin1String(
"MainThread"));
127 qDebug() <<
"Create singleton:" << T::staticMetaObject.className();
130 if constexpr (std::is_abstract_v<T> && std::is_destructible_v<T>)
139 QObject::connect(ptr, &QObject::destroyed, ptr, [] {
140 qDebug() <<
"Destroy singleton:" << T::staticMetaObject.className();
142 mSingletonHandler->add(ptr);
143 mSingletonCreator << std::bind(&Env::getOrCreateSingleton<T>,
this, std::placeholders::_1);
150 T* getOrCreateSingleton(
bool pCreate =
false)
152 static QPointer<T> instance = createSingleton<T>();
154 if (Q_UNLIKELY(pCreate))
157 Q_ASSERT(instance.isNull());
158 instance = createSingleton<T>();
166 inline T* fetchRealSingleton()
168 if constexpr (QtPrivate::IsPointerToTypeDerivedFromQObject<T*>::Value)
170 return getOrCreateSingleton<T>();
174 if constexpr (std::is_abstract_v<T> && std::is_destructible_v<T>)
176 static_assert(std::has_virtual_destructor_v<T>,
"Destructor must be virtual");
181 return &T::getInstance();
188 inline std::enable_if_t<QtPrivate::IsGadgetHelper<T>::IsRealGadget,
T*> checkObjectInfo(Identifier pId,
T* pObject)
const
196 inline std::enable_if_t<QtPrivate::IsPointerToTypeDerivedFromQObject<T*>::Value,
T*> checkObjectInfo(Identifier pId,
T* pObject)
const
198 if (!std::is_base_of<ThreadSafe, T>() && pObject->thread() != QThread::currentThread())
200 qWarning() << pId <<
"was created in" << pObject->thread()->objectName() <<
"but is requested by" << QThread::currentThread()->objectName();
202 Q_ASSERT(QCoreApplication::applicationName().startsWith(QLatin1String(
"Test_global_Env")));
211 inline T* fetchSingleton()
213 static_assert(QtPrivate::IsGadgetHelper<T>::IsRealGadget || QtPrivate::IsPointerToTypeDerivedFromQObject<T*>::Value,
214 "Singletons needs to be a Q_GADGET or an QObject/Q_OBJECT");
216 const Identifier
id = T::staticMetaObject.className();
219 const QReadLocker locker(&mLock);
220 obj = mInstancesSingleton.value(
id);
223 obj = fetchRealSingleton<T>();
225 return checkObjectInfo(
id,
static_cast<T*
>(obj));
229 template<
typename T,
typename ... Args>
230 inline T newObject(Args&& ... pArgs)
const
232 if constexpr (std::is_constructible_v<std::remove_pointer_t<T>, Args ...>)
234 if constexpr (std::is_pointer_v<T>)
236 using t = std::remove_pointer_t<T>;
237 return new t(std::forward<Args>(pArgs) ...);
241 return T(std::forward<Args>(pArgs) ...);
246 static_assert(std::is_pointer_v<T>,
"It is impossible to return implementation of interface by value. Use pointer or add constructor!");
254 template<
typename T,
typename ... Args>
255 T createObject(Args&& ... pArgs)
const
259 QReadLocker locker(&mLock);
263 for (
auto mock : std::as_const(mInstancesCreator))
265 auto creator = mock.dynamicCast<FuncWrapper<
T, Args ...>>();
269 return (*creator)(std::forward<Args>(pArgs) ...);
275 return newObject<T>(std::forward<Args>(pArgs) ...);
281 Q_ASSERT(mSingletonHandler.isNull());
282 mSingletonHandler =
new QObjectCleanupHandler();
283 QObject::connect(QCoreApplication::instance(), &QCoreApplication::aboutToQuit, mSingletonHandler.data(), &QObject::deleteLater);
285 const auto copy = mSingletonCreator;
286 mSingletonCreator.clear();
287 for (
const auto& func : copy)
300 getInstance().initialize();
307 return getInstance().fetchSingleton<
T>();
311 template<
typename T,
typename ... Args>
314 return getInstance().createObject<
T>(std::forward<Args>(pArgs) ...);
321 static_assert(QtPrivate::IsPointerToTypeDerivedFromQObject<T*>::Value,
"Shared class needs to be an QObject/Q_OBJECT");
323 const Identifier className = T::staticMetaObject.className();
325 auto& holder = getInstance();
326 holder.mSharedInstancesLock.lockForRead();
327 QSharedPointer<T> shared = qSharedPointerCast<T>(holder.mSharedInstances.value(className));
328 holder.mSharedInstancesLock.unlock();
330 if (!shared && pSpawn)
332 const QWriteLocker locker(&holder.mSharedInstancesLock);
333 shared = qSharedPointerCast<T>(holder.mSharedInstances.value(className));
336 qDebug() <<
"Spawn shared instance:" << className;
337 shared = QSharedPointer<T>::create();
338 holder.mSharedInstances.insert(className, shared.toWeakRef());
349 static void set(
const QMetaObject& pMetaObject,
void* pObject =
nullptr);
351 template<
typename T,
typename ... Args>
354 auto& holder = getInstance();
355 const QReadLocker locker(&holder.mLock);
357 for (
const auto& mock : std::as_const(holder.mInstancesCreator))
359 if (mock.dynamicCast<FuncWrapper<T, Args ...>>())
361 return mock->getCounter();
369 template<
typename T,
typename ... Args>
374 const auto& value = QSharedPointer<FuncWrapper<
T, Args ...>>
::create(std::move(pFunc));
376 auto& holder = getInstance();
377 const QWriteLocker locker(&holder.mLock);
379 QMutableListIterator<Wrapper> iter(holder.mInstancesCreator);
380 while (iter.hasNext())
383 if (iter.value().dynamicCast<FuncWrapper<T, Args ...>>())
385 iter.setValue(value);
390 holder.mInstancesCreator << value;
394 static void setShared(
const QMetaObject& pMetaObject,
const QSharedPointer<QObject>& pObject);