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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>
namespace GpgFrontend {
template <typename T>
class SingletonFunctionObject {
public:
static T& GetInstance(int channel = 0) {
if (!channel) {
std::lock_guard<std::mutex> guard(_instance_mutex);
if (_instance == nullptr) _instance = std::make_unique<T>();
return *_instance;
} else {
// 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 *_it->second;
else
return CreateInstance(channel);
}
}
static T& CreateInstance(int channel, std::unique_ptr<T> p_obj = nullptr) {
if (!channel) return *_instance;
// read _instances_map
decltype(_instances_map.end()) _it;
{
std::shared_lock lock(_instances_mutex);
_it = _instances_map.find(channel);
}
if (_it == _instances_map.end()) {
{
std::lock_guard<std::mutex> guard(_default_channel_mutex);
int tmp = channel;
std::swap(_default_channel, tmp);
if (p_obj == nullptr) p_obj = std::make_unique<T>();
std::swap(_default_channel, tmp);
}
T* obj = p_obj.get();
// change _instances_map
{
std::unique_lock lock(_instances_mutex);
_instances_map.insert({channel, std::move(p_obj)});
}
return *obj;
} else {
return *_it->second;
}
}
static int GetDefaultChannel() { return _default_channel; }
int GetChannel() const { return channel_; }
SingletonFunctionObject(T&&) = delete;
SingletonFunctionObject(const T&) = delete;
void operator=(const T&) = delete;
protected:
SingletonFunctionObject() {}
SingletonFunctionObject(int channel) : channel_(channel) {}
virtual ~SingletonFunctionObject() = default;
private:
int channel_ = _default_channel;
static int _default_channel;
static std::mutex _default_channel_mutex;
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;
};
template <typename T>
int SingletonFunctionObject<T>::_default_channel = 0;
template <typename T>
std::mutex SingletonFunctionObject<T>::_default_channel_mutex;
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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