1// Copyright (c) 2011 The LevelDB 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. See the AUTHORS file for names of contributors.
4
5#ifndef STORAGE_LEVELDB_DB_WRITE_BATCH_INTERNAL_H_
6#define STORAGE_LEVELDB_DB_WRITE_BATCH_INTERNAL_H_
7
8#include "leveldb/write_batch.h"
9
10namespace leveldb {
11
12class MemTable;
13
14// WriteBatchInternal provides static methods for manipulating a
15// WriteBatch that we don't want in the public WriteBatch interface.
16class WriteBatchInternal {
17 public:
18  // Return the number of entries in the batch.
19  static int Count(const WriteBatch* batch);
20
21  // Set the count for the number of entries in the batch.
22  static void SetCount(WriteBatch* batch, int n);
23
24  // Return the seqeunce number for the start of this batch.
25  static SequenceNumber Sequence(const WriteBatch* batch);
26
27  // Store the specified number as the seqeunce number for the start of
28  // this batch.
29  static void SetSequence(WriteBatch* batch, SequenceNumber seq);
30
31  static Slice Contents(const WriteBatch* batch) {
32    return Slice(batch->rep_);
33  }
34
35  static size_t ByteSize(const WriteBatch* batch) {
36    return batch->rep_.size();
37  }
38
39  static void SetContents(WriteBatch* batch, const Slice& contents);
40
41  static Status InsertInto(const WriteBatch* batch, MemTable* memtable);
42
43  static void Append(WriteBatch* dst, const WriteBatch* src);
44};
45
46}  // namespace leveldb
47
48
49#endif  // STORAGE_LEVELDB_DB_WRITE_BATCH_INTERNAL_H_
50