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73 linhas
2.1 KiB
73 linhas
2.1 KiB
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#ifndef STORAGE_LEVELDB_DB_WRITE_BATCH_INTERNAL_H_
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#define STORAGE_LEVELDB_DB_WRITE_BATCH_INTERNAL_H_
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#include "leveldb/write_batch.h"
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namespace leveldb {
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// WriteBatchInternal provides static methods for manipulating a
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// WriteBatch that we don't want in the public WriteBatch interface.
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class WriteBatchInternal {
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public:
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static void PutLargeValueRef(WriteBatch* batch,
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const Slice& key,
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const LargeValueRef& large_ref);
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// Return the number of entries in the batch.
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static int Count(const WriteBatch* batch);
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// Set the count for the number of entries in the batch.
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static void SetCount(WriteBatch* batch, int n);
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// Return the seqeunce number for the start of this batch.
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static SequenceNumber Sequence(const WriteBatch* batch);
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// Store the specified number as the seqeunce number for the start of
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// this batch.
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static void SetSequence(WriteBatch* batch, SequenceNumber seq);
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static Slice Contents(const WriteBatch* batch) {
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return Slice(batch->rep_);
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}
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static size_t ByteSize(const WriteBatch* batch) {
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return batch->rep_.size();
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}
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static void SetContents(WriteBatch* batch, const Slice& contents);
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static Status InsertInto(const WriteBatch* batch, MemTable* memtable);
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// Iterate over the contents of a write batch.
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class Iterator {
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public:
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explicit Iterator(const WriteBatch& batch);
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bool Done() const { return done_; }
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void Next();
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ValueType op() const { return op_; }
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const Slice& key() const { return key_; }
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const Slice& value() const { return value_; }
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SequenceNumber sequence_number() const { return seq_; }
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Status status() const { return status_; }
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private:
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void GetNextEntry();
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Slice input_;
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bool done_;
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ValueType op_;
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Slice key_;
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Slice value_;
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SequenceNumber seq_;
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Status status_;
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};
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};
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}
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#endif // STORAGE_LEVELDB_DB_WRITE_BATCH_INTERNAL_H_
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