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