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// Copyright (C) 2018 Intel Corporation
//
// SPDX-License-Identifier: Apache-2.0
//
/**
* @brief This is a wrapper class for handling plugin instantiation and releasing resources
* @file ie_so_pointer.hpp
*/
#pragma once
#include <memory>
#include "ie_so_loader.h"
#include "ie_common.h"
#include "ie_plugin.hpp"
#include "details/ie_exception.hpp"
#include "details/ie_no_release.hpp"
#include <string>
#include <cassert>
namespace InferenceEngine {
namespace details {
/**
* @brief This class is a C++ helper to load a symbol from a library and create its instance
*/
template<class Loader>
class SymbolLoader {
private:
std::shared_ptr<Loader> _so_loader;
public:
/**
* @brief The main constructor
* @param loader Library to load from
*/
explicit SymbolLoader(std::shared_ptr<Loader> loader) : _so_loader(loader) {}
/**
* @brief Calls a function from the library that creates an object and returns StatusCode
* @param name Name of function to load object with
* @return If StatusCode provided by function is OK then returns the loaded object. Throws an exception otherwise
*/
template<class T>
T* instantiateSymbol(const std::string& name) const {
T* instance = nullptr;
ResponseDesc desc;
StatusCode sts = bind_function<StatusCode(T*&, ResponseDesc*)>(name)(instance, &desc);
if (sts != OK) {
THROW_IE_EXCEPTION << desc.msg;
}
return instance;
}
/**
* @brief Loads function from the library and returns a pointer to it
* @param functionName Name of function to load
* @return The loaded function
*/
template<class T>
std::function<T> bind_function(const std::string &functionName) const {
std::function<T> ptr(reinterpret_cast<T *>(_so_loader->get_symbol(functionName.c_str())));
return ptr;
}
};
/**
* @brief This class is a trait class that provides a creator with a function name corresponding to the templated class parameter
*/
template<class T>
class SOCreatorTrait {};
/**
* @brief This class instantiate object using shared library
*/
template <class T, class Loader = SharedObjectLoader>
class SOPointer {
template <class U, class W> friend class SOPointer;
public:
/**
* @brief Default constructor
*/
SOPointer() = default;
/**
* @brief The main constructor
* @param name Name of a shared library file
*/
explicit SOPointer(const std::string &name)
: _so_loader(new Loader(name.c_str()))
, _pointedObj(details::shared_from_irelease(
SymbolLoader<Loader>(_so_loader).template instantiateSymbol<T>(SOCreatorTrait<T>::name))) {
}
/**
* @brief The copy-like constructor, can create So Pointer that dereferenced into child type if T is derived of U
* @param that copied SOPointer object
*/
template<class U, class W>
SOPointer(const SOPointer<U, W> & that) :
_so_loader(std::dynamic_pointer_cast<Loader>(that._so_loader)),
_pointedObj(std::dynamic_pointer_cast<T>(that._pointedObj)) {
}
/**
* @brief Standard pointer operator
* @return underlined interface with disabled Release method
*/
details::NoReleaseOn<T>* operator->() const noexcept {
return reinterpret_cast<details::NoReleaseOn<T>*>(_pointedObj.get());
}
/**
* @brief Standard dereference operator
* @return underlined interface with disabled Release method
*/
details::NoReleaseOn<T>* operator*() const noexcept {
return this->operator->();
}
explicit operator bool() const noexcept {
return (nullptr != _so_loader) && (nullptr != _pointedObj);
}
friend bool operator == (std::nullptr_t, const SOPointer& ptr) noexcept {
return !ptr;
}
friend bool operator == (const SOPointer& ptr, std::nullptr_t) noexcept {
return !ptr;
}
friend bool operator != (std::nullptr_t, const SOPointer& ptr) noexcept {
return static_cast<bool>(ptr);
}
friend bool operator != (const SOPointer& ptr, std::nullptr_t) noexcept {
return static_cast<bool>(ptr);
}
SOPointer& operator=(const SOPointer & pointer) noexcept {
_pointedObj = pointer._pointedObj;
_so_loader = pointer._so_loader;
return *this;
}
protected:
/**
* @brief Gets a smart pointer to the DLL
*/
std::shared_ptr<Loader> _so_loader;
/**
* @brief Gets a smart pointer to the custom object
*/
std::shared_ptr<T> _pointedObj;
};
} // namespace details
/**
* @brief Creates a special shared_pointer wrapper for the given type from a specific shared module
* @param name Name of the shared library file
*/
template <class T>
inline std::shared_ptr<T> make_so_pointer(const std::string & name) = delete;
} // namespace InferenceEngine
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