IndexedDB: Cursor pre-fetching.

content/renderer/indexed_db_dispatcher.h

 // Copyright (c) 2011 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 CONTENT_RENDERER_INDEXED_DB_DISPATCHER_H_
 #define CONTENT_RENDERER_INDEXED_DB_DISPATCHER_H_
 #pragma once
 
 #include <map>
 #include <vector>
@@ skipping 51 matching lines @@
       WebKit::WebIDBCallbacks* callbacks_ptr,
       int32 idb_cursor_id,
       WebKit::WebExceptionCode* ec);
 
   void RequestIDBCursorContinue(
       const IndexedDBKey& key,
       WebKit::WebIDBCallbacks* callbacks_ptr,
       int32 idb_cursor_id,
       WebKit::WebExceptionCode* ec);
 
+  void RequestIDBCursorPrefetch(
+      int n,
+      WebKit::WebIDBCallbacks* callbacks_ptr,
+      int32 idb_cursor_id,
+      WebKit::WebExceptionCode* ec);
+
+  void RequestIDBCursorPrefetchReset(int used_prefetches, int unused_prefetches,
+                                     int32 idb_cursor_id);
+
   void RequestIDBCursorDelete(
       WebKit::WebIDBCallbacks* callbacks_ptr,
       int32 idb_cursor_id,
       WebKit::WebExceptionCode* ec);
 
   void RequestIDBDatabaseClose(
       int32 idb_database_id);
 
   void RequestIDBDatabaseOpen(
       WebKit::WebIDBDatabaseCallbacks* callbacks_ptr,
@@ skipping 84 matching lines @@
   void OnSuccessIDBTransaction(int32 response_id, int32 object_id);
   void OnSuccessOpenCursor(int32 response_id, int32 object_id,
                            const IndexedDBKey& key,
                            const IndexedDBKey& primary_key,
                            const content::SerializedScriptValue& value);
   void OnSuccessCursorContinue(int32 response_id,
                                int32 cursor_id,
                                const IndexedDBKey& key,
                                const IndexedDBKey& primary_key,
                                const content::SerializedScriptValue& value);
+  void OnSuccessCursorPrefetch(
+      int32 response_id,
+      int32 cursor_id,
+      const std::vector<IndexedDBKey>& keys,
+      const std::vector<IndexedDBKey>& primary_keys,
+      const std::vector<content::SerializedScriptValue>& values);
   void OnSuccessStringList(int32 response_id,
                            const std::vector<string16>& value);
   void OnSuccessSerializedScriptValue(
       int32 response_id,
       const content::SerializedScriptValue& value);
   void OnError(int32 response_id, int code, const string16& message);
   void OnBlocked(int32 response_id);
   void OnAbort(int32 transaction_id);
   void OnComplete(int32 transaction_id);
   void OnVersionChange(int32 database_id, const string16& newVersion);
 
+  // Reset cursor prefetch caches for all cursors except exception_cursor_id.
+  void ResetCursorPrefetchCaches(int32 exception_cursor_id = -1);
+
   // Careful! WebIDBCallbacks wraps non-threadsafe data types. It must be
   // destroyed and used on the same thread it was created on.
   IDMap<WebKit::WebIDBCallbacks, IDMapOwnPointer> pending_callbacks_;
   IDMap<WebKit::WebIDBTransactionCallbacks, IDMapOwnPointer>
       pending_transaction_callbacks_;
   IDMap<WebKit::WebIDBDatabaseCallbacks, IDMapOwnPointer>
       pending_database_callbacks_;
 
   // Map from cursor id to RendererWebIDBCursorImpl.
   std::map<int32, RendererWebIDBCursorImpl*> cursors_;
 
   DISALLOW_COPY_AND_ASSIGN(IndexedDBDispatcher);
 };
 
 #endif  // CONTENT_RENDERER_INDEXED_DB_DISPATCHER_H_