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30 lines
1.3 KiB
30 lines
1.3 KiB
1 year ago
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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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//
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// 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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#pragma once
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#include <memory>
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#include "rocksdb/rocksdb_namespace.h"
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namespace ROCKSDB_NAMESPACE {
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class FSRandomAccessFile;
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// This file provides the following main abstractions:
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// SequentialFileReader : wrapper over Env::SequentialFile
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// RandomAccessFileReader : wrapper over Env::RandomAccessFile
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// WritableFileWriter : wrapper over Env::WritableFile
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// In addition, it also exposed NewReadaheadRandomAccessFile, NewWritableFile,
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// and ReadOneLine primitives.
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// NewReadaheadRandomAccessFile provides a wrapper over RandomAccessFile to
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// always prefetch additional data with every read. This is mainly used in
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// Compaction Table Readers.
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std::unique_ptr<FSRandomAccessFile> NewReadaheadRandomAccessFile(
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std::unique_ptr<FSRandomAccessFile>&& file, size_t readahead_size);
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} // namespace ROCKSDB_NAMESPACE
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