Summary: Closes https://github.com/facebook/rocksdb/pull/2226 Differential Revision: D4967547 Pulled By: siying fbshipit-source-id: dd3b58ae1e7a106ab6bb6f37ab5c88575b125ab4
194 lines
6.2 KiB
C++
194 lines
6.2 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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// This source code is also licensed under the GPLv2 license found in the
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// COPYING file in the root directory of this source tree.
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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 <atomic>
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#include <string>
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#include "port/port.h"
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#include "rocksdb/env.h"
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#include "util/aligned_buffer.h"
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namespace rocksdb {
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class Statistics;
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class HistogramImpl;
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std::unique_ptr<RandomAccessFile> NewReadaheadRandomAccessFile(
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std::unique_ptr<RandomAccessFile>&& file, size_t readahead_size);
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class SequentialFileReader {
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private:
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std::unique_ptr<SequentialFile> file_;
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std::atomic<size_t> offset_; // read offset
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public:
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explicit SequentialFileReader(std::unique_ptr<SequentialFile>&& _file)
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: file_(std::move(_file)), offset_(0) {}
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SequentialFileReader(SequentialFileReader&& o) ROCKSDB_NOEXCEPT {
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*this = std::move(o);
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}
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SequentialFileReader& operator=(SequentialFileReader&& o) ROCKSDB_NOEXCEPT {
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file_ = std::move(o.file_);
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return *this;
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}
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SequentialFileReader(const SequentialFileReader&) = delete;
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SequentialFileReader& operator=(const SequentialFileReader&) = delete;
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Status Read(size_t n, Slice* result, char* scratch);
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Status Skip(uint64_t n);
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SequentialFile* file() { return file_.get(); }
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bool use_direct_io() const { return file_->use_direct_io(); }
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protected:
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Status DirectRead(size_t n, Slice* result, char* scratch);
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};
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class RandomAccessFileReader {
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private:
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std::unique_ptr<RandomAccessFile> file_;
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Env* env_;
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Statistics* stats_;
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uint32_t hist_type_;
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HistogramImpl* file_read_hist_;
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public:
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explicit RandomAccessFileReader(std::unique_ptr<RandomAccessFile>&& raf,
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Env* env = nullptr,
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Statistics* stats = nullptr,
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uint32_t hist_type = 0,
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HistogramImpl* file_read_hist = nullptr)
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: file_(std::move(raf)),
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env_(env),
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stats_(stats),
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hist_type_(hist_type),
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file_read_hist_(file_read_hist) {}
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RandomAccessFileReader(RandomAccessFileReader&& o) ROCKSDB_NOEXCEPT {
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*this = std::move(o);
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}
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RandomAccessFileReader& operator=(RandomAccessFileReader&& o) ROCKSDB_NOEXCEPT{
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file_ = std::move(o.file_);
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env_ = std::move(o.env_);
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stats_ = std::move(o.stats_);
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hist_type_ = std::move(o.hist_type_);
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file_read_hist_ = std::move(o.file_read_hist_);
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return *this;
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}
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RandomAccessFileReader(const RandomAccessFileReader&) = delete;
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RandomAccessFileReader& operator=(const RandomAccessFileReader&) = delete;
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Status Read(uint64_t offset, size_t n, Slice* result, char* scratch) const;
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Status Prefetch(uint64_t offset, size_t n) const {
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return file_->Prefetch(offset, n);
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}
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RandomAccessFile* file() { return file_.get(); }
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bool use_direct_io() const { return file_->use_direct_io(); }
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protected:
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Status DirectRead(uint64_t offset, size_t n, Slice* result,
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char* scratch) const;
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};
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// Use posix write to write data to a file.
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class WritableFileWriter {
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private:
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std::unique_ptr<WritableFile> writable_file_;
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AlignedBuffer buf_;
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size_t max_buffer_size_;
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// Actually written data size can be used for truncate
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// not counting padding data
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uint64_t filesize_;
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// This is necessary when we use unbuffered access
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// and writes must happen on aligned offsets
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// so we need to go back and write that page again
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uint64_t next_write_offset_;
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bool pending_sync_;
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uint64_t last_sync_size_;
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uint64_t bytes_per_sync_;
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RateLimiter* rate_limiter_;
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Statistics* stats_;
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public:
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WritableFileWriter(std::unique_ptr<WritableFile>&& file,
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const EnvOptions& options, Statistics* stats = nullptr)
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: writable_file_(std::move(file)),
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buf_(),
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max_buffer_size_(options.writable_file_max_buffer_size),
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filesize_(0),
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next_write_offset_(0),
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pending_sync_(false),
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last_sync_size_(0),
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bytes_per_sync_(options.bytes_per_sync),
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rate_limiter_(options.rate_limiter),
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stats_(stats) {
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buf_.Alignment(writable_file_->GetRequiredBufferAlignment());
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buf_.AllocateNewBuffer(use_direct_io()
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? max_buffer_size_
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: std::min((size_t)65536, max_buffer_size_));
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}
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WritableFileWriter(const WritableFileWriter&) = delete;
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WritableFileWriter& operator=(const WritableFileWriter&) = delete;
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~WritableFileWriter() { Close(); }
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Status Append(const Slice& data);
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Status Flush();
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Status Close();
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Status Sync(bool use_fsync);
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// Sync only the data that was already Flush()ed. Safe to call concurrently
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// with Append() and Flush(). If !writable_file_->IsSyncThreadSafe(),
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// returns NotSupported status.
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Status SyncWithoutFlush(bool use_fsync);
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uint64_t GetFileSize() { return filesize_; }
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Status InvalidateCache(size_t offset, size_t length) {
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return writable_file_->InvalidateCache(offset, length);
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}
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WritableFile* writable_file() const { return writable_file_.get(); }
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bool use_direct_io() { return writable_file_->use_direct_io(); }
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private:
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// Used when os buffering is OFF and we are writing
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// DMA such as in Direct I/O mode
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#ifndef ROCKSDB_LITE
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Status WriteDirect();
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#endif // !ROCKSDB_LITE
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// Normal write
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Status WriteBuffered(const char* data, size_t size);
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Status RangeSync(uint64_t offset, uint64_t nbytes);
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size_t RequestToken(size_t bytes, bool align);
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Status SyncInternal(bool use_fsync);
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};
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extern Status NewWritableFile(Env* env, const std::string& fname,
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unique_ptr<WritableFile>* result,
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const EnvOptions& options);
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} // namespace rocksdb
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