content/browser/indexed_db/leveldb/leveldb_write_batch.h

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_WRITE_BATCH_H_
   6 #define CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_WRITE_BATCH_H_
   7
   8 #include "base/memory/scoped_ptr.h"
   9 #include "base/strings/string_piece.h"
  10
  11 namespace leveldb {
  12 class WriteBatch;
  13 }
  14
  15 namespace content {
  16
  17 // Wrapper around leveldb::WriteBatch.
  18 // This class holds a collection of updates to apply atomically to a database.
  19 class LevelDBWriteBatch {
  20  public:
  21   static scoped_ptr<LevelDBWriteBatch> Create();
  22   ~LevelDBWriteBatch();
  23
  24   void Put(const base::StringPiece& key, const base::StringPiece& value);
  25   void Remove(const base::StringPiece& key);  // Add remove operation to the
  26                                               // batch.
  27   void Clear();
  28
  29  private:
  30   friend class LevelDBDatabase;
  31   LevelDBWriteBatch();
  32
  33   scoped_ptr<leveldb::WriteBatch> write_batch_;
  34 };
  35
  36 }  // namespace content
  37
  38 #endif  // CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_WRITE_BATCH_H_