rocksdb/file/readahead_raf.h
sdong b931f84e56 Divide file_reader_writer.h and .cc (#5803)
Summary:
file_reader_writer.h and .cc contain several files and helper function, and it's hard to navigate. Separate it to multiple files and put them under file/
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5803

Test Plan: Build whole project using make and cmake.

Differential Revision: D17374550

fbshipit-source-id: 10efca907721e7a78ed25bbf74dc5410dea05987
2019-09-16 10:33:51 -07:00

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1.2 KiB
C++

// 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 <atomic>
#include "rocksdb/env.h"
namespace rocksdb {
// 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<RandomAccessFile> NewReadaheadRandomAccessFile(
std::unique_ptr<RandomAccessFile>&& file, size_t readahead_size);
} // namespace rocksdb