LevelDB storage for data reduction proxy to store data usage stats.

components/data_reduction_proxy/core/browser/data_store_impl.h

Index: components/data_reduction_proxy/core/browser/data_store_impl.h
diff --git a/components/data_reduction_proxy/core/browser/data_store_impl.h b/components/data_reduction_proxy/core/browser/data_store_impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..983d716b4688a53e1c2964044fbc79e7ad1663ce
--- /dev/null
+++ b/components/data_reduction_proxy/core/browser/data_store_impl.h
@@ -0,0 +1,57 @@
+// 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 <string>
+
+#include "base/files/file_path.h"
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/sequence_checker.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(const std::string& key, std::string* value) override;
+
+  Status Put(const std::map<std::string, std::string>& map) 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.
+  scoped_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_