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

components/data_reduction_proxy/core/browser/db_data_store.h

Index: components/data_reduction_proxy/core/browser/db_data_store.h
diff --git a/components/data_reduction_proxy/core/browser/db_data_store.h b/components/data_reduction_proxy/core/browser/db_data_store.h
new file mode 100644
index 0000000000000000000000000000000000000000..2f9c50d076af3f9ab1682e2a465bec612d2ab39e
--- /dev/null
+++ b/components/data_reduction_proxy/core/browser/db_data_store.h
@@ -0,0 +1,43 @@
+// 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_DB_DATA_STORE_H_
+#define COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DB_DATA_STORE_H_
+
+#include <map>
+#include <string>
+
+#include "base/macros.h"
+
+namespace data_reduction_proxy {
+
+// Interface for a permanent key/value store used by the Data Reduction Proxy
+// component. This class has no-op methods for clients that do not want to
+// support a permanent store. |DataReductionProxyStoreImpl| provides a LevelDB

[jeremyim, 2015/07/08 18:21:46]

Rename in comment

[Not at Google. Contact bengr, 2015/07/08 19:07:20]

Done.

+// implementation.
+class DBDataStore {

[jeremyim, 2015/07/08 18:21:46]

Just DataStore?

[Not at Google. Contact bengr, 2015/07/08 19:07:20]

Done.

+ public:
+  // Values are used in UMA. Do not change existing values; only append to the
+  // end. STATUS_MAX should always be last element.
+  enum Status { OK, NOT_FOUND, CORRUPTED, IO_ERROR, MISC_ERROR, STATUS_MAX };
+
+  DBDataStore();
+  virtual ~DBDataStore();
+
+  // Initializes the store on DB Thread.
+  virtual void InitializeOnDBThread();
+
+  // Gets the value from the store for the provided key.
+  virtual Status Get(const std::string& key, std::string* value);
+
+  // Persists the provided keys and values into the store.
+  virtual Status Put(const std::map<std::string, std::string>& map);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DBDataStore);
+};
+
+}  // namespace data_reduction_proxy
+
+#endif  // COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DB_DATA_STORE_H_