[IndexedDB] Integrating failures and corruption with transaction

content/browser/indexed_db/indexed_db_cursor.h

 // Copyright (c) 2013 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_INDEXED_DB_INDEXED_DB_CURSOR_H_
 #define CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_CURSOR_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "content/browser/indexed_db/indexed_db_backing_store.h"
 #include "content/browser/indexed_db/indexed_db_database.h"
+#include "content/browser/indexed_db/indexed_db_transaction.h"
 #include "content/common/indexed_db/indexed_db_key_range.h"
 #include "third_party/WebKit/public/platform/modules/indexeddb/WebIDBTypes.h"
 
 namespace content {
 
-class IndexedDBTransaction;
-
 class CONTENT_EXPORT IndexedDBCursor
     : NON_EXPORTED_BASE(public base::RefCounted<IndexedDBCursor>) {
  public:
   IndexedDBCursor(std::unique_ptr<IndexedDBBackingStore::Cursor> cursor,
                   indexed_db::CursorType cursor_type,
                   blink::WebIDBTaskType task_type,
                   IndexedDBTransaction* transaction);
 
   void Advance(uint32_t count, scoped_refptr<IndexedDBCallbacks> callbacks);
   void Continue(std::unique_ptr<IndexedDBKey> key,
                 std::unique_ptr<IndexedDBKey> primary_key,
                 scoped_refptr<IndexedDBCallbacks> callbacks);
   void PrefetchContinue(int number_to_fetch,
                         scoped_refptr<IndexedDBCallbacks> callbacks);
   leveldb::Status PrefetchReset(int used_prefetches, int unused_prefetches);
 
   const IndexedDBKey& key() const { return cursor_->key(); }
   const IndexedDBKey& primary_key() const { return cursor_->primary_key(); }
   IndexedDBValue* Value() const {
     return (cursor_type_ == indexed_db::CURSOR_KEY_ONLY) ? NULL
                                                          : cursor_->value();
   }
   void Close();
 
-  void CursorIterationOperation(std::unique_ptr<IndexedDBKey> key,
-                                std::unique_ptr<IndexedDBKey> primary_key,
-                                scoped_refptr<IndexedDBCallbacks> callbacks,
-                                IndexedDBTransaction* transaction);
-  void CursorAdvanceOperation(uint32_t count,
-                              scoped_refptr<IndexedDBCallbacks> callbacks,
-                              IndexedDBTransaction* transaction);
-  void CursorPrefetchIterationOperation(
+  leveldb::Status CursorIterationOperation(
+      std::unique_ptr<IndexedDBKey> key,
+      std::unique_ptr<IndexedDBKey> primary_key,
+      scoped_refptr<IndexedDBCallbacks> callbacks,
+      IndexedDBTransaction* transaction);
+  leveldb::Status CursorAdvanceOperation(
+      uint32_t count,
+      scoped_refptr<IndexedDBCallbacks> callbacks,
+      IndexedDBTransaction* transaction);
+  leveldb::Status CursorPrefetchIterationOperation(
       int number_to_fetch,
       scoped_refptr<IndexedDBCallbacks> callbacks,
       IndexedDBTransaction* transaction);
 
  private:
   friend class base::RefCounted<IndexedDBCursor>;
 
   ~IndexedDBCursor();
 
   blink::WebIDBTaskType task_type_;
   indexed_db::CursorType cursor_type_;
   const scoped_refptr<IndexedDBTransaction> transaction_;
 
   // Must be destroyed before transaction_.
   std::unique_ptr<IndexedDBBackingStore::Cursor> cursor_;
   // Must be destroyed before transaction_.
   std::unique_ptr<IndexedDBBackingStore::Cursor> saved_cursor_;
 
   bool closed_;
 
   DISALLOW_COPY_AND_ASSIGN(IndexedDBCursor);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_CURSOR_H_