b743906eea
MOE_MIGRATION= git-svn-id: https://leveldb.googlecode.com/svn/trunk@22 62dab493-f737-651d-591e-8d6aee1b9529
70 lines
2.0 KiB
C++
70 lines
2.0 KiB
C++
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file. See the AUTHORS file for names of contributors.
|
|
|
|
#ifndef STORAGE_LEVELDB_DB_WRITE_BATCH_INTERNAL_H_
|
|
#define STORAGE_LEVELDB_DB_WRITE_BATCH_INTERNAL_H_
|
|
|
|
#include "leveldb/write_batch.h"
|
|
|
|
namespace leveldb {
|
|
|
|
// WriteBatchInternal provides static methods for manipulating a
|
|
// WriteBatch that we don't want in the public WriteBatch interface.
|
|
class WriteBatchInternal {
|
|
public:
|
|
// Return the number of entries in the batch.
|
|
static int Count(const WriteBatch* batch);
|
|
|
|
// Set the count for the number of entries in the batch.
|
|
static void SetCount(WriteBatch* batch, int n);
|
|
|
|
// Return the seqeunce number for the start of this batch.
|
|
static SequenceNumber Sequence(const WriteBatch* batch);
|
|
|
|
// Store the specified number as the seqeunce number for the start of
|
|
// this batch.
|
|
static void SetSequence(WriteBatch* batch, SequenceNumber seq);
|
|
|
|
static Slice Contents(const WriteBatch* batch) {
|
|
return Slice(batch->rep_);
|
|
}
|
|
|
|
static size_t ByteSize(const WriteBatch* batch) {
|
|
return batch->rep_.size();
|
|
}
|
|
|
|
static void SetContents(WriteBatch* batch, const Slice& contents);
|
|
|
|
static Status InsertInto(const WriteBatch* batch, MemTable* memtable);
|
|
|
|
// Iterate over the contents of a write batch.
|
|
class Iterator {
|
|
public:
|
|
explicit Iterator(const WriteBatch& batch);
|
|
bool Done() const { return done_; }
|
|
void Next();
|
|
ValueType op() const { return op_; }
|
|
const Slice& key() const { return key_; }
|
|
const Slice& value() const { return value_; }
|
|
SequenceNumber sequence_number() const { return seq_; }
|
|
Status status() const { return status_; }
|
|
|
|
private:
|
|
void GetNextEntry();
|
|
|
|
Slice input_;
|
|
bool done_;
|
|
ValueType op_;
|
|
Slice key_;
|
|
Slice value_;
|
|
SequenceNumber seq_;
|
|
Status status_;
|
|
};
|
|
};
|
|
|
|
}
|
|
|
|
|
|
#endif // STORAGE_LEVELDB_DB_WRITE_BATCH_INTERNAL_H_
|