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annotate src/leveldb/db/write_batch_internal.h @ 3634:98b459278ba3 draft

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Import LevelDB 1.5, it will be used for the transaction database.
author Mike Hearn <hearn@google.com>
date Mon, 25 Jun 2012 11:17:22 +0200
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3634
98b459278ba3 Import LevelDB 1.5, it will be used for the transaction database.
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1 // Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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2 // Use of this source code is governed by a BSD-style license that can be
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3 // found in the LICENSE file. See the AUTHORS file for names of contributors.
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4
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5 #ifndef STORAGE_LEVELDB_DB_WRITE_BATCH_INTERNAL_H_
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6 #define STORAGE_LEVELDB_DB_WRITE_BATCH_INTERNAL_H_
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7
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8 #include "leveldb/write_batch.h"
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9
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10 namespace leveldb {
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11
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12 class MemTable;
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13
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14 // WriteBatchInternal provides static methods for manipulating a
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15 // WriteBatch that we don't want in the public WriteBatch interface.
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16 class WriteBatchInternal {
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17 public:
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18 // Return the number of entries in the batch.
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19 static int Count(const WriteBatch* batch);
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20
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21 // Set the count for the number of entries in the batch.
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22 static void SetCount(WriteBatch* batch, int n);
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23
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24 // Return the seqeunce number for the start of this batch.
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25 static SequenceNumber Sequence(const WriteBatch* batch);
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26
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27 // Store the specified number as the seqeunce number for the start of
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28 // this batch.
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29 static void SetSequence(WriteBatch* batch, SequenceNumber seq);
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30
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31 static Slice Contents(const WriteBatch* batch) {
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32 return Slice(batch->rep_);
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33 }
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34
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35 static size_t ByteSize(const WriteBatch* batch) {
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36 return batch->rep_.size();
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37 }
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38
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39 static void SetContents(WriteBatch* batch, const Slice& contents);
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40
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41 static Status InsertInto(const WriteBatch* batch, MemTable* memtable);
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42
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43 static void Append(WriteBatch* dst, const WriteBatch* src);
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44 };
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45
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46 } // namespace leveldb
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47
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48
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49 #endif // STORAGE_LEVELDB_DB_WRITE_BATCH_INTERNAL_H_