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