8055008909
Summary: How it works: * GetUpdatesSince takes a SequenceNumber. * A LogFile with the first SequenceNumber nearest and lesser than the requested Sequence Number is found. * Seek in the logFile till the requested SeqNumber is found. * Return an iterator which contains logic to return record's one by one. Test Plan: * Test case included to check the good code path. * Will update with more test-cases. * Feedback required on test-cases. Reviewers: dhruba, emayanke Reviewed By: dhruba CC: leveldb Differential Revision: https://reviews.facebook.net/D7119
51 lines
1.5 KiB
C++
51 lines
1.5 KiB
C++
// 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/types.h"
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#include "leveldb/write_batch.h"
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namespace leveldb {
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class MemTable;
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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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// 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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static void Append(WriteBatch* dst, const WriteBatch* src);
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};
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} // namespace leveldb
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#endif // STORAGE_LEVELDB_DB_WRITE_BATCH_INTERNAL_H_
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