IndexedDB: Recycle cursor objects when calling continue().

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 "base/id_map.h"
 #include "base/nullable_string16.h"
 #include "ipc/ipc_channel.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebExceptionCode.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebIDBCallbacks.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebIDBDatabase.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebIDBObjectStore.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebIDBTransactionCallbacks.h"
 
 class IndexedDBKey;
+class RendererWebIDBCursorImpl;
 
 namespace WebKit {
 class WebDOMStringList;
 class WebFrame;
 class WebIDBKeyRange;
 class WebIDBTransaction;
 }
 
 namespace content {
 class SerializedScriptValue;
@@ skipping 115 matching lines @@
       unsigned short direction,
       WebKit::WebIDBCallbacks* callbacks,
       int32 idb_object_store_id,
       const WebKit::WebIDBTransaction& transaction,
       WebKit::WebExceptionCode* ec);
 
   void RegisterWebIDBTransactionCallbacks(
       WebKit::WebIDBTransactionCallbacks* callbacks,
       int32 id);
 
+  void CursorDestroyed(int32 cursor_id);
+
   static int32 TransactionId(const WebKit::WebIDBTransaction& transaction);
 
  private:
   // IDBCallback message handlers.
   void OnSuccessNull(int32 response_id);
   void OnSuccessIDBDatabase(int32 response_id, int32 object_id);
   void OnSuccessIndexedDBKey(int32 response_id, const IndexedDBKey& key);
   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 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);
 
   // 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_