1 /* 2 * Copyright (c) Facebook, Inc. and its affiliates. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #pragma once 18 19 #include <folly/FileUtil.h> 20 #include <folly/json.h> 21 #include <folly/portability/Unistd.h> 22 #include <wangle/client/persistence/LRUPersistentCache.h> 23 24 namespace wangle { 25 26 class FilePersistenceLayer : public CachePersistence { 27 public: FilePersistenceLayer(const std::string & file)28 explicit FilePersistenceLayer(const std::string& file) : file_(file) {} ~FilePersistenceLayer()29 ~FilePersistenceLayer() override {} 30 31 bool persist(const folly::dynamic& arrayOfKvPairs) noexcept override; 32 33 folly::Optional<folly::dynamic> load() noexcept override; 34 35 void clear() override; 36 37 private: 38 std::string file_; 39 }; 40 41 } // namespace wangle 42