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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 OPERATION_CACHE_HPP
#define OPERATION_CACHE_HPP
#include <cstddef>
#include <cstdint>
#include <functional>
#include <mutex>
#include <optional>
#include <shared_mutex>
#include <string>
#include <unordered_map>
#include <utility>
#include "google/longrunning/operations.pb.h"
class OperationCache final {
using Operation = ::google::longrunning::Operation;
public:
OperationCache() noexcept = default;
~OperationCache() noexcept = default;
OperationCache(OperationCache const&) = delete;
auto operator=(OperationCache const&) -> OperationCache& = delete;
OperationCache(OperationCache&&) = delete;
auto operator=(OperationCache&&) -> OperationCache& = delete;
void Set(std::string const& action, Operation const& op) {
SetInternal(action, op);
}
[[nodiscard]] auto Query(std::string const& x) const noexcept
-> std::optional<Operation> {
return QueryInternal(x);
}
void SetExponent(std::uint8_t x) noexcept { threshold_ = 1U << x; }
private:
mutable std::shared_mutex mutex_;
std::unordered_map<std::string, ::google::longrunning::Operation> cache_;
static constexpr std::uint8_t kDefaultExponent{14};
std::size_t threshold_{1U << kDefaultExponent};
void SetInternal(std::string const& action, Operation const& op) {
std::unique_lock lock{mutex_};
GarbageCollection();
cache_[action] = op;
}
[[nodiscard]] auto QueryInternal(std::string const& x) const noexcept
-> std::optional<Operation> {
std::shared_lock lock{mutex_};
auto it = cache_.find(x);
if (it != cache_.end()) {
return it->second;
}
return std::nullopt;
}
void DropInternal(std::string const& x) noexcept {
cache_[x].Clear();
cache_.erase(x);
}
void GarbageCollection();
};
#endif // OPERATION_CACHE_HPP
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