IndexedDB: Recycle cursor objects when calling continue().

content/browser/in_process_webkit/indexed_db_dispatcher_host.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_BROWSER_IN_PROCESS_WEBKIT_INDEXED_DB_DISPATCHER_HOST_H_
 #define CONTENT_BROWSER_IN_PROCESS_WEBKIT_INDEXED_DB_DISPATCHER_HOST_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/id_map.h"
@@ skipping 47 matching lines @@
 
   // The various IndexedDBCallbacks children call these methods to add the
   // results into the applicable map.  See below for more details.
   int32 Add(WebKit::WebIDBCursor* idb_cursor);
   int32 Add(WebKit::WebIDBDatabase* idb_database, const GURL& origin_url);
   int32 Add(WebKit::WebIDBIndex* idb_index);
   int32 Add(WebKit::WebIDBObjectStore* idb_object_store);
   int32 Add(WebKit::WebIDBTransaction* idb_transaction, const GURL& origin_url);
   int32 Add(WebKit::WebDOMStringList* domStringList);
 
+  WebKit::WebIDBCursor* getCursorFromId(int32 cursor_id) {
+    return GetOrTerminateProcess(&cursor_dispatcher_host_->map_, cursor_id);
+  }
+
+  int32 GetAndConsumeCursorIdForPendingContinue(int32 response_id) {
+    int32 cursor_id = pending_cursor_continues_[response_id];
+    pending_cursor_continues_.erase(response_id);
+    return cursor_id;
+  }
+
  private:
   virtual ~IndexedDBDispatcherHost();
 
   // Message processing. Most of the work is delegated to the dispatcher hosts
   // below.
   void OnIDBFactoryGetDatabaseNames(
       const IndexedDBHostMsg_FactoryGetDatabaseNames_Params& p);
   void OnIDBFactoryOpen(const IndexedDBHostMsg_FactoryOpen_Params& p);
 
   void OnIDBFactoryDeleteDatabase(
@@ skipping 184 matching lines @@
     void OnDidCompleteTaskEvents(int transaction_id);
     void OnDestroyed(int32 idb_transaction_id);
 
     IndexedDBDispatcherHost* parent_;
     typedef IDMap<WebKit::WebIDBTransaction, IDMapOwnPointer> MapType;
     MapType map_;
     WebIDBObjectIDToURLMap transaction_url_map_;
     WebIDBTransactionIDToSizeMap transaction_size_map_;
   };
 
+
   // Data shared between renderer processes with the same browser context.
   scoped_refptr<WebKitContext> webkit_context_;
 
   // Only access on WebKit thread.
   scoped_ptr<DatabaseDispatcherHost> database_dispatcher_host_;
   scoped_ptr<IndexDispatcherHost> index_dispatcher_host_;
   scoped_ptr<ObjectStoreDispatcherHost> object_store_dispatcher_host_;
   scoped_ptr<CursorDispatcherHost> cursor_dispatcher_host_;
   scoped_ptr<TransactionDispatcherHost> transaction_dispatcher_host_;
 
   // Used to dispatch messages to the correct view host.
   int process_id_;
 
+  // Map from response id to cursor id. Access on WebKit thread only.
+  std::map<int32,int32> pending_cursor_continues_;
+
   DISALLOW_IMPLICIT_CONSTRUCTORS(IndexedDBDispatcherHost);
 };
 
 #endif  // CONTENT_BROWSER_IN_PROCESS_WEBKIT_INDEXED_DB_DISPATCHER_HOST_H_