Persist sessionStorage on disk.

webkit/dom_storage/local_storage_database_adapter.h

+// Copyright (c) 2012 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 WEBKIT_DOM_STORAGE_LOCAL_STORAGE_DATABASE_ADAPTER_H_
+#define WEBKIT_DOM_STORAGE_LOCAL_STORAGE_DATABASE_ADAPTER_H_
+#pragma once
+
+#include "base/gtest_prod_util.h"
+#include "base/memory/scoped_ptr.h"
+#include "webkit/dom_storage/dom_storage_database_adapter.h"
+
+class FilePath;
+
+namespace dom_storage {
+
+class DomStorageDatabase;
+
+class LocalStorageDatabaseAdapter : public DomStorageDatabaseAdapter {
+ public:
+  explicit LocalStorageDatabaseAdapter(const FilePath& path);
+  virtual ~LocalStorageDatabaseAdapter();
+  virtual void ReadAllValues(ValuesMap* result) OVERRIDE;
+  virtual bool CommitChanges(bool clear_all_first,
+                             const ValuesMap& changes) OVERRIDE;
+  virtual void DeleteFiles() OVERRIDE;
+  virtual void Reset() OVERRIDE;
+ protected:
+  // Constructor that uses an in-memory sqlite database, for testing.
+  LocalStorageDatabaseAdapter();
+
+ private:
+  FRIEND_TEST_ALL_PREFIXES(DomStorageAreaTest, BackingDatabaseOpened);
+  FRIEND_TEST_ALL_PREFIXES(DomStorageAreaTest, CommitChangesAtShutdown);
+  FRIEND_TEST_ALL_PREFIXES(DomStorageAreaTest, CommitTasks);
+  FRIEND_TEST_ALL_PREFIXES(DomStorageAreaTest, DeleteOrigin);
+  FRIEND_TEST_ALL_PREFIXES(DomStorageAreaTest, PurgeMemory);
+
+  scoped_ptr<DomStorageDatabase> db_;
+
+  DISALLOW_COPY_AND_ASSIGN(LocalStorageDatabaseAdapter);
+};
+
+}  // namespace dom_storage
+
+#endif  // WEBKIT_DOM_STORAGE_LOCAL_STORAGE_DATABASE_ADAPTER_H_