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/**
* Copyright (C) 2021 Saturneric <[email protected]>
*
* 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.
*
* GpgFrontend 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 GpgFrontend. If not, see <https://www.gnu.org/licenses/>.
*
* The initial version of the source code is inherited from
* the gpg4usb project, which is under GPL-3.0-or-later.
*
* All the source code of GpgFrontend was modified and released by
* Saturneric <[email protected]> starting on May 12, 2021.
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#include "SingletonStorageCollection.h"
#include <memory>
#include <shared_mutex>
#include "core/function/SecureMemoryAllocator.h"
#include "core/function/basic/SingletonStorage.h"
#include "core/utils/MemoryUtils.h"
namespace GpgFrontend {
SecureUniquePtr<SingletonStorageCollection> global_instance = nullptr;
class SingletonStorageCollection::Impl {
public:
/**
* @brief Get the Instance object
*
* @return SingletonStorageCollection*
*/
static auto GetInstance(bool force_refresh) -> SingletonStorageCollection* {
if (force_refresh || global_instance == nullptr) {
global_instance = SecureCreateUniqueObject<SingletonStorageCollection>();
SPDLOG_TRACE(
"a new global singleton storage collection created, address: {}",
static_cast<void*>(global_instance.get()));
}
return global_instance.get();
}
/**
* @brief Get the Instance object
*
* @return SingletonStorageCollection*
*/
static void Destroy() { global_instance = nullptr; }
/**
* @brief Get the Singleton Storage object
*
* @param singleton_function_object
* @return SingletonStorage*
*/
auto GetSingletonStorage(const std::type_info& type_id) -> SingletonStorage* {
const auto hash = type_id.hash_code();
while (true) {
decltype(storages_map_.end()) ins_it;
{
std::shared_lock<std::shared_mutex> lock(storages_mutex_);
ins_it = storages_map_.find(hash);
}
if (ins_it == storages_map_.end()) {
auto storage = SecureCreateUniqueObject<SingletonStorage>();
SPDLOG_TRACE(
"hash: {} created, singleton storage address: {} type_name: {}",
hash, static_cast<void*>(storage.get()), type_id.name());
{
std::unique_lock<std::shared_mutex> lock(storages_mutex_);
storages_map_.insert({hash, std::move(storage)});
}
continue;
}
return ins_it->second.get();
}
}
private:
std::shared_mutex storages_mutex_; ///< mutex for storages_map_
std::map<size_t, SingletonStoragePtr> storages_map_;
};
SingletonStorageCollection::SingletonStorageCollection() noexcept
: p_(SecureCreateUniqueObject<Impl>()) {}
SingletonStorageCollection::~SingletonStorageCollection() = default;
auto GpgFrontend::SingletonStorageCollection::GetInstance(bool force_refresh)
-> GpgFrontend::SingletonStorageCollection* {
return Impl::GetInstance(force_refresh);
}
void SingletonStorageCollection::Destroy() {
SPDLOG_TRACE(
"global singleton storage collection is about to destroy, address: {}",
static_cast<void*>(global_instance.get()));
return SingletonStorageCollection::Impl::Destroy();
}
auto SingletonStorageCollection::GetSingletonStorage(
const std::type_info& type_id) -> GpgFrontend::SingletonStorage* {
return p_->GetSingletonStorage(type_id);
}
} // namespace GpgFrontend
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