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