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#pragma once
#include <util/system/guard.h>
#include <util/system/rwlock.h>
#include <util/generic/map.h>
#include <util/generic/set.h>
#include <util/generic/singleton.h>
#include <util/generic/yexception.h>
namespace NObjectFactory {
template <class TProduct, class... TArgs>
class IFactoryObjectCreator {
public:
virtual TProduct* Create(TArgs... args) const = 0;
virtual ~IFactoryObjectCreator() {
}
};
template <class TProduct>
class IFactoryObjectCreator<TProduct, void> {
public:
virtual TProduct* Create(void) const = 0;
virtual ~IFactoryObjectCreator() {
}
};
#define FACTORY_OBJECT_NAME(Name) \
static TString GetTypeName() { \
return #Name; \
} \
virtual TString GetType() const override { \
return #Name; \
}
template <class TBaseProduct, class TDerivedProduct, class... TArgs>
class TFactoryObjectCreator: public IFactoryObjectCreator<TBaseProduct, TArgs...> {
TDerivedProduct* Create(TArgs... args) const override {
return new TDerivedProduct(std::forward<TArgs>(args)...);
}
};
template <class TBaseProduct, class TDerivedProduct>
class TFactoryObjectCreator<TBaseProduct, TDerivedProduct, void>: public IFactoryObjectCreator<TBaseProduct, void> {
TDerivedProduct* Create() const override {
return new TDerivedProduct();
}
};
template <class P, class K, class... TArgs>
class IObjectFactory {
public:
typedef P TProduct;
typedef K TKey;
public:
template <class TDerivedProduct>
void Register(const TKey& key, IFactoryObjectCreator<TProduct, TArgs...>* creator) {
if (!creator)
ythrow yexception() << "Please specify non-null creator for " << key;
TWriteGuard guard(CreatorsLock);
if (!Creators.insert(typename ICreators::value_type(key, creator)).second)
ythrow yexception() << "Product with key " << key << " already registered";
}
template <class TDerivedProduct>
void Register(const TKey& key) {
Register<TDerivedProduct>(key, new TFactoryObjectCreator<TProduct, TDerivedProduct, TArgs...>);
}
void GetKeys(TSet<TKey>& keys) const {
TReadGuard guard(CreatorsLock);
keys.clear();
for (typename ICreators::const_iterator i = Creators.begin(), e = Creators.end(); i != e; ++i) {
keys.insert(i->first);
}
}
protected:
template <class T>
IFactoryObjectCreator<TProduct, TArgs...>* GetCreator(const T& key) const {
TReadGuard guard(CreatorsLock);
typename ICreators::const_iterator i = Creators.find(key);
return i == Creators.end() ? nullptr : i->second.Get();
}
template <class T>
bool HasImpl(const T& key) const {
TReadGuard guard(CreatorsLock);
return Creators.find(key) != Creators.end();
}
private:
typedef TSimpleSharedPtr<IFactoryObjectCreator<TProduct, TArgs...>> ICreatorPtr;
typedef TMap<TKey, ICreatorPtr> ICreators;
ICreators Creators;
TRWMutex CreatorsLock;
};
template <class TProduct, class TKey, class... TArgs>
class TParametrizedObjectFactory: public IObjectFactory<TProduct, TKey, TArgs...> {
public:
template <class T>
TProduct* Create(const T& key, TArgs... args) const {
IFactoryObjectCreator<TProduct, TArgs...>* creator = IObjectFactory<TProduct, TKey, TArgs...>::GetCreator(key);
return creator == nullptr ? nullptr : creator->Create(std::forward<TArgs>(args)...);
}
template <class T>
static bool Has(const T& key) {
return Singleton<TParametrizedObjectFactory<TProduct, TKey, TArgs...>>()->HasImpl(key);
}
template <class T>
static TProduct* Construct(const T& key, const TKey& defKey, TArgs... args) {
TProduct* result = Singleton<TParametrizedObjectFactory<TProduct, TKey, TArgs...>>()->Create(key, std::forward<TArgs>(args)...);
if (!result && !!defKey) {
result = Singleton<TParametrizedObjectFactory<TProduct, TKey, TArgs...>>()->Create(defKey, std::forward<TArgs>(args)...);
}
return result;
}
template <class T>
static TProduct* Construct(const T& key, TArgs... args) {
return Singleton<TParametrizedObjectFactory<TProduct, TKey, TArgs...>>()->Create(key, std::forward<TArgs>(args)...);
}
template <class... Args>
static THolder<TProduct> VerifiedConstruct(Args&&... args) {
auto result = MakeHolder(std::forward<Args>(args)...);
Y_ABORT_UNLESS(result, "Construct by factory failed");
return result;
}
template<class... Args>
static THolder<TProduct> MakeHolder(Args&&... args) {
return THolder<TProduct>(Construct(std::forward<Args>(args)...));
}
static void GetRegisteredKeys(TSet<TKey>& keys) {
return Singleton<TParametrizedObjectFactory<TProduct, TKey, TArgs...>>()->GetKeys(keys);
}
static TSet<TKey> GetRegisteredKeys() {
TSet<TKey> keys;
Singleton<TParametrizedObjectFactory<TProduct, TKey, TArgs...>>()->GetKeys(keys);
return keys;
}
template <class TDerivedProduct>
static TSet<TKey> GetRegisteredKeys() {
TSet<TKey> registeredKeys(GetRegisteredKeys());
TSet<TKey> fileredKeys;
std::copy_if(registeredKeys.begin(), registeredKeys.end(), std::inserter(fileredKeys, fileredKeys.end()), [](const TKey& key) {
THolder<TProduct> objectHolder(Construct(key));
return !!dynamic_cast<const TDerivedProduct*>(objectHolder.Get());
});
return fileredKeys;
}
template <class Product>
class TRegistrator {
public:
TRegistrator(const TKey& key, IFactoryObjectCreator<TProduct, TArgs...>* creator) {
Singleton<TParametrizedObjectFactory<TProduct, TKey, TArgs...>>()->template Register<Product>(key, creator);
}
TRegistrator(const TKey& key) {
Singleton<TParametrizedObjectFactory<TProduct, TKey, TArgs...>>()->template Register<Product>(key);
}
TRegistrator()
: TRegistrator(Product::GetTypeName())
{
}
TString GetName() const {
return Product::GetTypeName();
}
};
};
template <class TProduct, class TKey, class... TArgs>
using TObjectFactory = TParametrizedObjectFactory<TProduct, TKey, TArgs...>;
}
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