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/*
* Copyright (C) 2017-2018 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 <map>
#include <memory>
#include <mutex>
namespace KODI
{
using RegistrationIdentifierType = int;
class ISignalHandlerData
{
protected:
~ISignalHandlerData() = default;
public:
virtual void Unregister(RegistrationIdentifierType id) = 0;
};
class CSignalRegistration
{
std::weak_ptr<ISignalHandlerData> m_list;
RegistrationIdentifierType m_registration;
template<typename ManagedT>
friend class CSignalHandlerList;
CSignalRegistration(std::shared_ptr<ISignalHandlerData> const& list, RegistrationIdentifierType registration)
: m_list{list}, m_registration{registration}
{
}
CSignalRegistration(CSignalRegistration const& other) = delete;
CSignalRegistration& operator=(CSignalRegistration const& other) = delete;
public:
CSignalRegistration() noexcept = default;
CSignalRegistration(CSignalRegistration&& other) noexcept
{
*this = std::move(other);
}
inline CSignalRegistration& operator=(CSignalRegistration&& other) noexcept
{
Unregister();
std::swap(m_list, other.m_list);
m_registration = other.m_registration;
return *this;
}
~CSignalRegistration() noexcept
{
Unregister();
}
inline void Unregister()
{
if (auto list = m_list.lock())
{
list->Unregister(m_registration);
list.reset();
}
}
};
template<typename ManagedT>
class CSignalHandlerList
{
/**
* Internal storage for handler list
*
* Extra struct so memory handling with shared_ptr and weak_ptr can be done
* on this level
*/
struct Data final : public ISignalHandlerData
{
CCriticalSection m_handlerCriticalSection;
std::map<RegistrationIdentifierType, ManagedT> m_handlers;
void Unregister(RegistrationIdentifierType id) override
{
std::unique_lock<CCriticalSection> lock(m_handlerCriticalSection);
m_handlers.erase(id);
}
};
std::shared_ptr<Data> m_data;
RegistrationIdentifierType m_lastRegistrationId{};
CSignalHandlerList(CSignalHandlerList const& other) = delete;
CSignalHandlerList& operator=(CSignalHandlerList const& other) = delete;
public:
CSignalHandlerList()
: m_data{new Data}
{}
CSignalRegistration Register(ManagedT const& handler)
{
std::unique_lock<CCriticalSection> lock(m_data->m_handlerCriticalSection);
bool inserted{false};
while(!inserted)
{
inserted = m_data->m_handlers.emplace(++m_lastRegistrationId, handler).second;
}
return {m_data, m_lastRegistrationId};
}
/**
* Invoke all registered signal handlers with the provided arguments
* when the signal type is a std::function or otherwise implements
* operator()
*/
template<typename... ArgsT>
void Invoke(ArgsT&&... args)
{
std::unique_lock<CCriticalSection> lock(m_data->m_handlerCriticalSection);
for (auto const& handler : *this)
{
handler.second(std::forward<ArgsT>(args)...);
}
}
auto begin() const { return m_data->m_handlers.cbegin(); }
auto end() const { return m_data->m_handlers.cend(); }
/**
* Get critical section for accessing the handler list
* \note You must lock this yourself if you iterate through the handler
* list manually without using \ref Invoke or similar.
*/
CCriticalSection const& CriticalSection() const
{
return m_data->m_handlerCriticalSection;
}
};
}
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