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

components/data_reduction_proxy/core/browser/db_data_owner.h

Index: components/data_reduction_proxy/core/browser/db_data_owner.h
diff --git a/components/data_reduction_proxy/core/browser/db_data_owner.h b/components/data_reduction_proxy/core/browser/db_data_owner.h
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+++ b/components/data_reduction_proxy/core/browser/db_data_owner.h
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+// 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_SERVICE_H_
+#define COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DB_SERVICE_H_
+
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "base/sequence_checker.h"
+
+namespace base {
+class FilePath;
+}  // namespace base
+
+namespace data_reduction_proxy {
+class DataStore;
+class DataUsageBucket;
+class DataUsageStore;
+
+typedef base::Callback<void(scoped_ptr<DataUsageBucket>)>
+    OnLoadDataUsageBucketCallback;
+
+// Contains and initializes all Data Reduction Proxy objects that have a
+// lifetime based on the DB task runner.
+class DBDataOwner {
+ public:
+  explicit DBDataOwner(scoped_ptr<DataStore> store);
+  virtual ~DBDataOwner();
+
+  // Initializes all the DB objects. Must be called on the DB task runner.
+  void InitializeOnDBThread();
+
+  // Loads the last stored data usage bucket from |DataStore| into |bucket|.
+  void LoadCurrentDataUsageBucket(DataUsageBucket* bucket);
+
+  // Stores |current| to |DataStore|.
+  void StoreCurrentDataUsageBucket(scoped_ptr<DataUsageBucket> current);
+
+  // Returns a weak pointer to self for use on UI thread.
+  base::WeakPtr<DBDataOwner> GetWeakPtr();
+
+ private:
+  scoped_ptr<DataStore> store_;
+  scoped_ptr<DataUsageStore> data_usage_;
+  base::SequenceChecker sequence_checker_;
+  base::WeakPtrFactory<DBDataOwner> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(DBDataOwner);
+};
+
+}  // namespace data_reduction_proxy
+#endif  // COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DB_SERVICE_H_