From 0251f35c93e3f0e0a6853a50fb5bd82c1b9e4187 Mon Sep 17 00:00:00 2001
From: saturneric <eric@bktus.com>
Date: Mon, 6 Nov 2023 17:17:47 +0800
Subject: refactor: clean up core's codes

---
 src/core/function/basic/SingletonStorage.cpp | 118 +++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 src/core/function/basic/SingletonStorage.cpp

(limited to 'src/core/function/basic/SingletonStorage.cpp')

diff --git a/src/core/function/basic/SingletonStorage.cpp b/src/core/function/basic/SingletonStorage.cpp
new file mode 100644
index 00000000..567d3572
--- /dev/null
+++ b/src/core/function/basic/SingletonStorage.cpp
@@ -0,0 +1,118 @@
+/**
+ * Copyright (C) 2021 Saturneric <eric@bktus.com>
+ *
+ * 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 <eric@bktus.com> starting on May 12, 2021.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ */
+
+#include "SingletonStorage.h"
+
+#include <shared_mutex>
+
+#include "core/function/basic/ChannelObject.h"
+
+namespace GpgFrontend {
+
+class SingletonStorage::Impl {
+ public:
+  void ReleaseChannel(int channel) {
+    decltype(instances_map_.end()) ins_it;
+    {
+      std::shared_lock<std::shared_mutex> lock(instances_mutex_);
+      ins_it = instances_map_.find(channel);
+    }
+    if (ins_it != instances_map_.end()) instances_map_.erase(ins_it);
+  }
+
+  auto FindObjectInChannel(int channel) -> GpgFrontend::ChannelObject* {
+    // read instances_map_
+    decltype(instances_map_.end()) ins_it;
+    {
+      std::shared_lock<std::shared_mutex> lock(instances_mutex_);
+      ins_it = instances_map_.find(channel);
+      if (ins_it == instances_map_.end()) {
+        return nullptr;
+      }
+      return ins_it->second.get();
+    }
+  }
+
+  auto GetAllChannelId() -> std::vector<int> {
+    std::vector<int> channels;
+    channels.reserve(instances_map_.size());
+    for (const auto& [key, value] : instances_map_) {
+      channels.push_back(key);
+    }
+    return channels;
+  }
+
+  auto SetObjectInChannel(int channel, std::unique_ptr<ChannelObject> p_obj)
+      -> GpgFrontend::ChannelObject* {
+    {
+      SPDLOG_TRACE("set channel: {} instance address: {}", channel,
+                   static_cast<void*>(&instances_map_));
+
+      assert(p_obj != nullptr);
+      if (p_obj == nullptr) return nullptr;
+
+      auto* raw_obj = p_obj.get();
+      p_obj->SetChannel(channel);
+      {
+        std::unique_lock<std::shared_mutex> lock(instances_mutex_);
+        instances_map_.insert({channel, std::move(p_obj)});
+      }
+      return raw_obj;
+    }
+  }
+
+ private:
+  std::shared_mutex instances_mutex_;  ///< mutex for _instances_map
+  std::map<int, std::unique_ptr<ChannelObject>>
+      instances_map_;  ///< map of singleton instances
+};
+
+SingletonStorage::SingletonStorage() noexcept : p_(std::make_unique<Impl>()) {}
+
+SingletonStorage::~SingletonStorage() = default;
+
+void SingletonStorage::ReleaseChannel(int channel) {
+  p_->ReleaseChannel(channel);
+}
+
+auto SingletonStorage::FindObjectInChannel(int channel)
+    -> GpgFrontend::ChannelObject* {
+  return p_->FindObjectInChannel(channel);
+}
+
+auto SingletonStorage::GetAllChannelId() -> std::vector<int> {
+  return p_->GetAllChannelId();
+}
+
+auto SingletonStorage::SetObjectInChannel(int channel,
+                                          std::unique_ptr<ChannelObject> p_obj)
+    -> GpgFrontend::ChannelObject* {
+  return p_->SetObjectInChannel(channel, std::move(p_obj));
+}
+
+};  // namespace GpgFrontend
\ No newline at end of file
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