Persist sessionStorage on disk.

webkit/dom_storage/session_storage_database.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_SESSION_STORAGE_DATABASE_H_
 #define WEBKIT_DOM_STORAGE_SESSION_STORAGE_DATABASE_H_
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 36 matching lines @@
   // be removed and all others will be inserted/updated as appropriate. It is
   // allowed to write data into a shallow copy created by CloneNamespace, and in
   // that case the copy will be made deep before writing the values.
   bool CommitAreaChanges(int64 namespace_id,
                          const GURL& origin,
                          bool clear_all_first,
                          const ValuesMap& changes);
 
   // Creates shallow copies of the areas for |namespace_id| and associates them
   // with |new_namespace_id|.
-  bool CloneNamespace(int64 namespace_id, int64 new_namespace_id);
+  void CloneNamespace(int64 namespace_id, int64 new_namespace_id);
 
   // Deletes the data for |namespace_id| and |origin|.
-  bool DeleteArea(int64 namespace_id, const GURL& origin);
+  void DeleteArea(int64 namespace_id, const GURL& origin);
 
   // Deletes the data for |namespace_id|.
   bool DeleteNamespace(int64 namespace_id);
 
+  // Reads all namespace ids from the database.
+  bool ReadNamespaceIds(std::vector<int64>* namespace_ids);
+
  private:
   friend class base::RefCountedThreadSafe<SessionStorageDatabase>;
   friend class SessionStorageDatabaseTest;
 
   ~SessionStorageDatabase();
 
   bool LazyOpen(bool create_if_needed);
   leveldb::Status TryToOpen(const FilePath& file_path, leveldb::DB** db);
   bool IsOpen() const;
 
@@ skipping 26 matching lines @@
                            std::map<std::string, std::string>* areas);
 
   // Adds an association between |origin| and |map_id| into the namespace
   // |namespace_id|.
   void AddAreaToNamespace(int64 namespace_id,
                           const std::string& origin,
                           const std::string& map_id,
                           leveldb::WriteBatch* batch);
 
   // Helpers for deleting data for |namespace_id| and |origin|.
-  bool DeleteArea(int64 namespace_id,
-                  const std::string& origin,
-                  leveldb::WriteBatch* batch);
-  bool DeleteArea(const std::string& namespace_id_str,
-                  const std::string& origin,
-                  leveldb::WriteBatch* batch);
+  bool DeleteAreaHelper(int64 namespace_id,
+                        const std::string& origin,
+                        leveldb::WriteBatch* batch);
+  bool DeleteAreaHelper(const std::string& namespace_id_str,
+                        const std::string& origin,
+                        leveldb::WriteBatch* batch);
 
   // Retrieves the map id for |namespace_id| and |origin|. It's not an error if
   // the map doesn't exist.
   bool GetMapForArea(int64 namespace_id,
                      const GURL& origin,
                      bool* exists,
                      std::string* map_id);
   bool GetMapForArea(const std::string& namespace_id_str,
                      const std::string& origin,
                      bool* exists,
@@ skipping 74 matching lines @@
   // the offset yet. The namespaces ids which are handled as strings (named
   // namesapce_id_str) contain the offset.
   int64 namespace_offset_;
 
   DISALLOW_COPY_AND_ASSIGN(SessionStorageDatabase);
 };
 
 }  // namespace dom_storage
 
 #endif  // WEBKIT_DOM_STORAGE_SESSION_STORAGE_DATABASE_H_