Summary: This diff simplifies EnvOptions by treating it as POD, similar to Options. - virtual functions are removed and member fields are accessed directly. - StorageOptions is removed. - Options.allow_readahead and Options.allow_readahead_compactions are deprecated. - Unused global variables are removed: useOsBuffer, useFsReadAhead, useMmapRead, useMmapWrite Test Plan: make check; db_stress Reviewers: dhruba CC: leveldb Differential Revision: https://reviews.facebook.net/D11175main
Haobo Xu
12 years ago
parent
5679107b07
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bdf1085944
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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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//
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#ifndef STORAGE_LEVELDB_UTIL_STORAGE_OPTIONS_H_ |
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#define STORAGE_LEVELDB_UTIL_STORAGE_OPTIONS_H_ |
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#include <string> |
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#include <stdint.h> |
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#include "leveldb/env.h" |
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#include "leveldb/options.h" |
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namespace leveldb { |
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// Environment Options that are used to read files from storage
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class StorageOptions : public EnvOptions { |
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public: |
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/* implicit */ StorageOptions(const Options& opt) : |
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data_in_os_(opt.allow_os_buffer), |
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fs_readahead_(opt.allow_readahead), |
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readahead_compactions_(opt.allow_readahead_compactions), |
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use_mmap_reads_(opt.allow_mmap_reads), |
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use_mmap_writes_(opt.allow_mmap_writes), |
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set_fd_cloexec_(opt.is_fd_close_on_exec) { |
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} |
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// copy constructor with readaheads set to readahead_compactions_
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StorageOptions(const StorageOptions& opt) { |
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data_in_os_ = opt.UseOsBuffer(); |
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fs_readahead_ = opt.UseReadaheadCompactions(); |
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readahead_compactions_ = opt.UseReadaheadCompactions(); |
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use_mmap_reads_ = opt.UseMmapReads(); |
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use_mmap_writes_ = opt.UseMmapWrites(); |
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set_fd_cloexec_ = opt.IsFDCloseOnExec(); |
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} |
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// constructor with default options
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StorageOptions() { |
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Options opt; |
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data_in_os_ = opt.allow_os_buffer; |
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fs_readahead_ = opt.allow_readahead; |
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readahead_compactions_ = fs_readahead_; |
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use_mmap_reads_ = opt.allow_mmap_reads; |
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use_mmap_writes_ = opt.allow_mmap_writes; |
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set_fd_cloexec_ = opt.is_fd_close_on_exec; |
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} |
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virtual ~StorageOptions() {} |
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bool UseOsBuffer() const { return data_in_os_; }; |
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bool UseReadahead() const { return fs_readahead_; }; |
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bool UseMmapReads() const { return use_mmap_reads_; } |
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bool UseMmapWrites() const { return use_mmap_writes_; } |
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bool UseReadaheadCompactions() const { return readahead_compactions_;} |
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bool IsFDCloseOnExec() const { return set_fd_cloexec_;} |
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void DisableMmapWrites() { |
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use_mmap_writes_ = false; |
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} |
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private: |
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bool data_in_os_; |
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bool fs_readahead_; |
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bool readahead_compactions_; |
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bool use_mmap_reads_; |
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bool use_mmap_writes_; |
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bool set_fd_cloexec_; |
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}; |
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} // namespace leveldb
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#endif // STORAGE_LEVELDB_UTIL_STORAGE_OPTIONS_H_
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