Persist sessionStorage on disk.

webkit/dom_storage/dom_storage_namespace.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_DOM_STORAGE_NAMESPACE_H_
 #define WEBKIT_DOM_STORAGE_DOM_STORAGE_NAMESPACE_H_
 #pragma once
 
 #include <map>
 
 #include "base/basictypes.h"
 #include "base/file_path.h"
 #include "base/memory/ref_counted.h"
 
 class GURL;
 
 namespace dom_storage {
 
 class DomStorageArea;
 class DomStorageTaskRunner;
+class SessionStorageDatabase;
 
 // Container for the set of per-origin Areas.
 // See class comments for DomStorageContext for a larger overview.
 class DomStorageNamespace
     : public base::RefCountedThreadSafe<DomStorageNamespace> {
  public:
   // Constructor for a LocalStorage namespace with id of 0
   // and an optional backing directory on disk.
   DomStorageNamespace(const FilePath& directory,  // may be empty
                       DomStorageTaskRunner* task_runner);
 
-  // Constructor for a SessionStorage namespace with a non-zero id
-  // and no backing directory on disk.
+  // Constructor for a SessionStorage namespace with a non-zero id and an
+  // optional backing on disk via |session_storage_database| (may be NULL).
   DomStorageNamespace(int64 namespace_id,
                       const std::string& persistent_namespace_id,
+                      SessionStorageDatabase* session_storage_database,
                       DomStorageTaskRunner* task_runner);
 
   int64 namespace_id() const { return namespace_id_; }
   const std::string& persistent_namespace_id() const {
     return persistent_namespace_id_;
   }
 
   // Returns the storage area for the given origin,
   // creating instance if needed. Each call to open
   // must be balanced with a call to CloseStorageArea.
@@ skipping 27 matching lines @@
   ~DomStorageNamespace();
 
   // Returns a pointer to the area holder in our map or NULL.
   AreaHolder* GetAreaHolder(const GURL& origin);
 
   int64 namespace_id_;
   std::string persistent_namespace_id_;
   FilePath directory_;
   AreaMap areas_;
   scoped_refptr<DomStorageTaskRunner> task_runner_;
+  scoped_refptr<SessionStorageDatabase> session_storage_database_;
 };
 
 }  // namespace dom_storage
 
 
 #endif  // WEBKIT_DOM_STORAGE_DOM_STORAGE_NAMESPACE_H_