Inside Bitcoin

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