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/**
* This file is part of GpgFrontend.
*
* GpgFrontend is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Foobar is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Foobar. If not, see <https://www.gnu.org/licenses/>.
*
* The initial version of the source code is inherited from gpg4usb-team.
* Their source code version also complies with GNU General Public License.
*
* The source code version of this software was modified and released
* by Saturneric<[email protected]> starting on May 12, 2021.
*
*/
#ifndef GPGFRONTEND_ZH_CN_TS_FUNCTIONOBJECT_H
#define GPGFRONTEND_ZH_CN_TS_FUNCTIONOBJECT_H
#include <easyloggingpp/easylogging++.h>
#include <map>
#include <memory>
#include <mutex>
#include <shared_mutex>
#include <stdexcept>
#include <string>
#include "GpgConstants.h"
namespace GpgFrontend {
template <typename T>
class SingletonFunctionObject {
public:
static T& GetInstance(
int channel = GpgFrontend::GPGFRONTEND_DEFAULT_CHANNEL) {
static_assert(std::is_base_of<SingletonFunctionObject<T>, T>::value,
"T not derived from SingletonFunctionObject<T>");
auto _p_pbj = find_object_in_channel(channel);
if (_p_pbj == nullptr)
return *set_object_in_channel(channel, std::make_unique<T>(channel));
else
return *_p_pbj;
}
static T& CreateInstance(int channel,
std::function<std::unique_ptr<T>(void)> factory) {
static_assert(std::is_base_of<SingletonFunctionObject<T>, T>::value,
"T not derived from SingletonFunctionObject<T>");
auto _p_pbj = find_object_in_channel(channel);
if (_p_pbj == nullptr)
return *set_object_in_channel(channel, std::move(factory()));
else
return *_p_pbj;
}
static T& CreateInstance(int channel, std::unique_ptr<T> p_obj = nullptr) {
static_assert(std::is_base_of<SingletonFunctionObject<T>, T>::value,
"T not derived from SingletonFunctionObject<T>");
auto _p_pbj = find_object_in_channel(channel);
if (_p_pbj == nullptr)
return *set_object_in_channel(channel, std::move(p_obj));
else
return *_p_pbj;
}
static T& ReleaseChannel(int channel) {
decltype(_instances_map.end()) _it;
{
std::shared_lock lock(_instances_mutex);
_it = _instances_map.find(channel);
}
if (_it != _instances_map.end()) _instances_map.erase(_it);
DLOG(INFO) << "channel" << channel << "released";
}
static int GetDefaultChannel() { return _default_channel; }
[[nodiscard]] int GetChannel() const { return channel_; }
SingletonFunctionObject(T&&) = delete;
SingletonFunctionObject(const T&) = delete;
void operator=(const T&) = delete;
protected:
SingletonFunctionObject() = default;
explicit SingletonFunctionObject(int channel) : channel_(channel) {}
virtual ~SingletonFunctionObject() = default;
void SetChannel(int channel) { this->channel_ = channel; }
private:
int channel_ = _default_channel;
static int _default_channel;
static std::mutex _instance_mutex;
static std::shared_mutex _instances_mutex;
static std::unique_ptr<T> _instance;
static std::map<int, std::unique_ptr<T>> _instances_map;
static T* find_object_in_channel(int channel) {
// read _instances_map
decltype(_instances_map.end()) _it;
{
std::shared_lock lock(_instances_mutex);
_it = _instances_map.find(channel);
if (_it == _instances_map.end())
return nullptr;
else
return _it->second.get();
}
}
static T* set_object_in_channel(int channel, std::unique_ptr<T> p_obj) {
{
if (p_obj == nullptr) p_obj = std::make_unique<T>();
T* obj = p_obj.get();
obj->SetChannel(channel);
{
std::unique_lock lock(_instances_mutex);
_instances_map.insert({channel, std::move(p_obj)});
}
return obj;
}
}
};
template <typename T>
int SingletonFunctionObject<T>::_default_channel =
GpgFrontend::GPGFRONTEND_DEFAULT_CHANNEL;
template <typename T>
std::mutex SingletonFunctionObject<T>::_instance_mutex;
template <typename T>
std::shared_mutex SingletonFunctionObject<T>::_instances_mutex;
template <typename T>
std::unique_ptr<T> SingletonFunctionObject<T>::_instance = nullptr;
template <typename T>
std::map<int, std::unique_ptr<T>> SingletonFunctionObject<T>::_instances_map;
} // namespace GpgFrontend
#endif // GPGFRONTEND_ZH_CN_TS_FUNCTIONOBJECT_H
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