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// Copyright 2023 Huawei Cloud Computing Technology Co., Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef INCLUDED_SRC_BUILDTOOL_PROGRESS_REPORTING_TASK_TRACKER_HPP
#define INCLUDED_SRC_BUILDTOOL_PROGRESS_REPORTING_TASK_TRACKER_HPP
#include <cstddef>
#include <cstdint>
#include <mutex>
#include <string>
#include <unordered_map>
#include "src/buildtool/logging/log_level.hpp"
#include "src/buildtool/logging/logger.hpp"
class TaskTracker {
public:
auto Start(const std::string& id) noexcept -> void {
std::unique_lock lock(m_);
++prio_;
try {
running_.emplace(id, prio_);
} catch (...) {
Logger::Log(LogLevel::Warning,
"Internal error in progress tracking; progress reports "
"might be incorrect.");
}
}
auto Stop(const std::string& id) noexcept -> void {
std::unique_lock lock(m_);
running_.erase(id);
}
[[nodiscard]] auto Sample() noexcept -> std::string {
std::unique_lock lock(m_);
std::string result{};
std::uint64_t started = prio_ + 1;
for (auto const& it : running_) {
if (it.second < started) {
result = it.first;
started = it.second;
}
}
return result;
}
[[nodiscard]] auto Active() noexcept -> std::size_t {
std::unique_lock lock(m_);
return running_.size();
}
private:
std::uint64_t prio_{};
std::mutex m_;
std::unordered_map<std::string, std::uint64_t> running_;
};
#endif // INCLUDED_SRC_BUILDTOOL_PROGRESS_REPORTING_TASK_TRACKER_HPP
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