Framing for a DOMStorage backend that does not depend on in-process-webkit.

webkit/dom_storage/dom_storage_host.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_HOST_H_
+#define WEBKIT_DOM_STORAGE_DOM_STORAGE_HOST_H_
+#pragma once
+
+#include <map>
+
+#include "base/callback.h"
+#include "base/memory/ref_counted.h"
+#include "base/nullable_string16.h"
+#include "base/string16.h"
+
+class GURL;
+
+namespace dom_storage {
+
+class DomStorageContext;
+class DomStorageHost;
+class DomStorageNamespace;
+class DomStorageArea;
+
+// One instance is allocated in the main process for each client process.
+// Used by DomStorageMessageFilter in Chrome and by SimpleDomStorage in DRT.
+// This class is single threaded, and performs blocking file reads/writes,
+// so it shouldn't be used on chrome's IO thread.
+class DomStorageHost {
+ public:
+  DomStorageHost(DomStorageContext* context);
+  ~DomStorageHost();
+
+  int OpenStorageArea(int namespace_id, const GURL& origin);
+  void CloseStorageArea(int connection_id);
+
+  int GetAreaLength(int connection_id);
+  NullableString16 GetAreaKey(int connection_id, int index);
+  NullableString16 GetAreaItem(int connection_id, const string16& key);
+  bool SetAreaItem(int connection_id, const string16& key,
+                   const string16& value, const GURL& page_url,
+                   NullableString16* old_value);
+  bool RemoveAreaItem(int connection_id, const string16& key,
+                  const GURL& page_url,
+                  string16* old_value);
+  bool ClearArea(int connection_id, const GURL& page_url);
+
+
+ private:
+  typedef std::map<int, scoped_refptr<DomStorageArea> > AreaMap;
+
+  DomStorageArea* GetOpenArea(int connection_id);
+
+  int last_connection_id_;
+  scoped_refptr<DomStorageContext> context_;
+  AreaMap connections_;
+};
+
+}  // namespace dom_storage
+
+#endif  // WEBKIT_DOM_STORAGE_DOM_STORAGE_HOST_H_