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/*
* Copyright (C) 2022 Team Kodi
* This file is part of Kodi - https://kodi.tv
*
* SPDX-License-Identifier: GPL-2.0-or-later
* See LICENSES/README.md for more information.
*/
#pragma once
#include "threads/CriticalSection.h"
#include <cstddef>
#include <memory>
#include <mutex>
#include <stdexcept>
#include <typeindex>
#include <unordered_map>
#include <utility>
//! \brief A generic container for components.
//! \details A component has to be derived from the BaseType.
//! Only a single instance of each derived type can be registered.
//! Intended use is through inheritance.
template<class BaseType>
class CComponentContainer
{
public:
//! \brief Obtain a component.
template<class T>
std::shared_ptr<T> GetComponent()
{
return std::const_pointer_cast<T>(std::as_const(*this).template GetComponent<T>());
}
//! \brief Obtain a component.
template<class T>
std::shared_ptr<const T> GetComponent() const
{
std::unique_lock<CCriticalSection> lock(m_critSection);
const auto it = m_components.find(std::type_index(typeid(T)));
if (it != m_components.end())
return std::static_pointer_cast<const T>((*it).second);
throw std::logic_error("ComponentContainer: Attempt to obtain non-existent component");
}
//! \brief Returns number of registered components.
std::size_t size() const { return m_components.size(); }
protected:
//! \brief Register a new component instance.
void RegisterComponent(const std::shared_ptr<BaseType>& component)
{
if (!component)
return;
// Note: Extra var needed to avoid clang warning
// "Expression with side effects will be evaluated despite being used as an operand to 'typeid'"
// https://stackoverflow.com/questions/46494928/clang-warning-on-expression-side-effects
const auto& componentRef = *component;
std::unique_lock<CCriticalSection> lock(m_critSection);
m_components.insert({std::type_index(typeid(componentRef)), component});
}
//! \brief Deregister a component.
void DeregisterComponent(const std::type_info& typeInfo)
{
std::unique_lock<CCriticalSection> lock(m_critSection);
m_components.erase(typeInfo);
}
private:
mutable CCriticalSection m_critSection; //!< Critical section for map updates
std::unordered_map<std::type_index, std::shared_ptr<BaseType>>
m_components; //!< Map of components
};
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