text: // Copyright 2015 The Chromium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  #ifndef COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_STORE_IMPL_H_
  #define COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_STORE_IMPL_H_
  
  #include <map>
  #include <memory>
  #include <string>
  
  #include "base/files/file_path.h"
  #include "base/macros.h"
  #include "base/sequence_checker.h"
  #include "base/strings/string_piece.h"
  #include "components/data_reduction_proxy/core/browser/data_store.h"
  
  namespace leveldb {
  class DB;
  }
  
  namespace data_reduction_proxy {
  
  // Implementation of |DataStore| using LevelDB.
  class DataStoreImpl : public DataStore {
   public:
    explicit DataStoreImpl(const base::FilePath& profile_path);
    ~DataStoreImpl() override;
  
    // Overrides of DataStore.
    void InitializeOnDBThread() override;
  
    Status Get(base::StringPiece key, std::string* value) override;
  
    Status Put(const std::map<std::string, std::string>& map) override;
  
    Status Delete(base::StringPiece key) override;
  
   private:
    // Opens the underlying LevelDB for read and write.
    Status OpenDB();
  
    // Deletes the LevelDB and recreates it. This method is called if any DB call
    // returns a |CORRUPTED| status.
    void RecreateDB();
  
    // The underlying LevelDB used by this implementation.
    std::unique_ptr<leveldb::DB> db_;
  
    // Path to the profile using this store.
    const base::FilePath profile_path_;
  
    base::SequenceChecker sequence_checker_;
  
    DISALLOW_COPY_AND_ASSIGN(DataStoreImpl);
  };
  
  }  // namespace data_reduction_proxy
  
  #endif  // COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_STORE_IMPL_H_
  