6e9fbeb27c
Summary: We want to keep Env a think layer for better portability. Less platform dependent codes should be moved out of Env. In this patch, I create a wrapper of file readers and writers, and put rate limiting, write buffering, as well as most perf context instrumentation and random kill out of Env. It will make it easier to maintain multiple Env in the future. Test Plan: Run all existing unit tests. Reviewers: anthony, kradhakrishnan, IslamAbdelRahman, yhchiang, igor Reviewed By: igor Subscribers: leveldb, dhruba Differential Revision: https://reviews.facebook.net/D42321
79 lines
2.8 KiB
C++
79 lines
2.8 KiB
C++
// Copyright (c) 2013, 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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//
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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 <stdint.h>
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#include <memory>
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#include <string>
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#include "rocksdb/flush_block_policy.h"
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#include "rocksdb/table.h"
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#include "db/dbformat.h"
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namespace rocksdb {
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struct EnvOptions;
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using std::unique_ptr;
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class BlockBasedTableBuilder;
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class BlockBasedTableFactory : public TableFactory {
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public:
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explicit BlockBasedTableFactory(
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const BlockBasedTableOptions& table_options = BlockBasedTableOptions());
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~BlockBasedTableFactory() {}
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const char* Name() const override { return "BlockBasedTable"; }
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Status NewTableReader(const ImmutableCFOptions& ioptions,
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const EnvOptions& soptions,
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const InternalKeyComparator& internal_comparator,
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unique_ptr<RandomAccessFileReader>&& file,
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uint64_t file_size,
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unique_ptr<TableReader>* table_reader) const override {
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return NewTableReader(ioptions, soptions, internal_comparator,
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std::move(file), file_size, table_reader,
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/*prefetch_index_and_filter=*/true);
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}
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// This is a variant of virtual member function NewTableReader function with
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// added capability to disable pre-fetching of blocks on BlockBasedTable::Open
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Status NewTableReader(const ImmutableCFOptions& ioptions,
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const EnvOptions& soptions,
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const InternalKeyComparator& internal_comparator,
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unique_ptr<RandomAccessFileReader>&& file,
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uint64_t file_size,
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unique_ptr<TableReader>* table_reader,
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bool prefetch_index_and_filter) const;
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TableBuilder* NewTableBuilder(
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const TableBuilderOptions& table_builder_options,
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WritableFileWriter* file) const override;
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// Sanitizes the specified DB Options.
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Status SanitizeOptions(const DBOptions& db_opts,
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const ColumnFamilyOptions& cf_opts) const override;
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std::string GetPrintableTableOptions() const override;
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const BlockBasedTableOptions& GetTableOptions() const;
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private:
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BlockBasedTableOptions table_options_;
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};
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extern const std::string kHashIndexPrefixesBlock;
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extern const std::string kHashIndexPrefixesMetadataBlock;
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extern const std::string kPropTrue;
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extern const std::string kPropFalse;
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} // namespace rocksdb
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