mirror of https://github.com/facebook/rocksdb.git
111 lines
3.4 KiB
C++
111 lines
3.4 KiB
C++
// Copyright (c) 2019-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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#include "env/composite_env_wrapper.h"
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#include "rocksdb/file_system.h"
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#include "options/db_options.h"
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#include "rocksdb/utilities/object_registry.h"
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namespace rocksdb {
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FileSystem::FileSystem() {}
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FileSystem::~FileSystem() {}
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Status FileSystem::Load(const std::string& value,
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std::shared_ptr<FileSystem>* result) {
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Status s;
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#ifndef ROCKSDB_LITE
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s = ObjectRegistry::NewInstance()->NewSharedObject<FileSystem>(value, result);
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#else
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(void)result;
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s = Status::NotSupported("Cannot load FileSystem in LITE mode: ", value);
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#endif
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return s;
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}
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FileOptions FileSystem::OptimizeForLogRead(
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const FileOptions& file_options) const {
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FileOptions optimized_file_options(file_options);
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optimized_file_options.use_direct_reads = false;
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return optimized_file_options;
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}
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FileOptions FileSystem::OptimizeForManifestRead(
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const FileOptions& file_options) const {
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FileOptions optimized_file_options(file_options);
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optimized_file_options.use_direct_reads = false;
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return optimized_file_options;
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}
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FileOptions FileSystem::OptimizeForLogWrite(const FileOptions& file_options,
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const DBOptions& db_options) const {
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FileOptions optimized_file_options(file_options);
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optimized_file_options.bytes_per_sync = db_options.wal_bytes_per_sync;
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optimized_file_options.writable_file_max_buffer_size =
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db_options.writable_file_max_buffer_size;
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return optimized_file_options;
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}
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FileOptions FileSystem::OptimizeForManifestWrite(
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const FileOptions& file_options) const {
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return file_options;
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}
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FileOptions FileSystem::OptimizeForCompactionTableWrite(
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const FileOptions& file_options,
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const ImmutableDBOptions& db_options) const {
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FileOptions optimized_file_options(file_options);
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optimized_file_options.use_direct_writes =
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db_options.use_direct_io_for_flush_and_compaction;
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return optimized_file_options;
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}
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FileOptions FileSystem::OptimizeForCompactionTableRead(
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const FileOptions& file_options,
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const ImmutableDBOptions& db_options) const {
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FileOptions optimized_file_options(file_options);
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optimized_file_options.use_direct_reads = db_options.use_direct_reads;
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return optimized_file_options;
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}
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Status ReadFileToString(FileSystem* fs, const std::string& fname,
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std::string* data) {
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FileOptions soptions;
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data->clear();
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std::unique_ptr<FSSequentialFile> file;
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Status s = fs->NewSequentialFile(fname, soptions, &file, nullptr);
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if (!s.ok()) {
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return s;
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}
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static const int kBufferSize = 8192;
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char* space = new char[kBufferSize];
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while (true) {
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Slice fragment;
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s = file->Read(kBufferSize, IOOptions(), &fragment, space,
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nullptr);
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if (!s.ok()) {
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break;
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}
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data->append(fragment.data(), fragment.size());
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if (fragment.empty()) {
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break;
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}
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}
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delete[] space;
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return s;
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}
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#ifdef OS_WIN
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std::shared_ptr<FileSystem> FileSystem::Default() {
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static LegacyFileSystemWrapper default_fs(Env::Default());
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static std::shared_ptr<LegacyFileSystemWrapper> default_fs_ptr(
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&default_fs, [](LegacyFileSystemWrapper*) {});
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return default_fs_ptr;
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}
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#endif
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} // namespace rocksdb
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