fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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100 lines
3.5 KiB
100 lines
3.5 KiB
// Copyright (c) 2011-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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// 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 <memory>
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#include <string>
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#include <utility>
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#include <vector>
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#include "file/random_access_file_reader.h"
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#include "rocksdb/env.h"
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#include "rocksdb/options.h"
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#include "table/table_reader.h"
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namespace ROCKSDB_NAMESPACE {
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class Arena;
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class TableReader;
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struct ImmutableOptions;
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class CuckooTableReader : public TableReader {
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public:
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CuckooTableReader(const ImmutableOptions& ioptions,
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std::unique_ptr<RandomAccessFileReader>&& file,
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uint64_t file_size, const Comparator* user_comparator,
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uint64_t (*get_slice_hash)(const Slice&, uint32_t,
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uint64_t));
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~CuckooTableReader() {}
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std::shared_ptr<const TableProperties> GetTableProperties() const override {
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return table_props_;
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}
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Status status() const { return status_; }
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Status Get(const ReadOptions& readOptions, const Slice& key,
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GetContext* get_context, const SliceTransform* prefix_extractor,
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bool skip_filters = false) override;
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// Returns a new iterator over table contents
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// compaction_readahead_size: its value will only be used if for_compaction =
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// true
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InternalIterator* NewIterator(const ReadOptions&,
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const SliceTransform* prefix_extractor,
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Arena* arena, bool skip_filters,
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TableReaderCaller caller,
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size_t compaction_readahead_size = 0,
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bool allow_unprepared_value = false) override;
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void Prepare(const Slice& target) override;
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// Report an approximation of how much memory has been used.
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size_t ApproximateMemoryUsage() const override;
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// Following methods are not implemented for Cuckoo Table Reader
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uint64_t ApproximateOffsetOf(const ReadOptions& /*read_options*/,
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const Slice& /*key*/,
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TableReaderCaller /*caller*/) override {
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return 0;
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}
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uint64_t ApproximateSize(const ReadOptions& /* read_options */,
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const Slice& /*start*/, const Slice& /*end*/,
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TableReaderCaller /*caller*/) override {
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return 0;
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}
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void SetupForCompaction() override {}
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// End of methods not implemented.
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private:
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friend class CuckooTableIterator;
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void LoadAllKeys(std::vector<std::pair<Slice, uint32_t>>* key_to_bucket_id);
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std::unique_ptr<RandomAccessFileReader> file_;
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Slice file_data_;
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bool is_last_level_;
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bool identity_as_first_hash_;
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bool use_module_hash_;
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std::shared_ptr<const TableProperties> table_props_;
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Status status_;
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uint32_t num_hash_func_;
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std::string unused_key_;
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uint32_t key_length_;
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uint32_t user_key_length_;
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uint32_t value_length_;
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uint32_t bucket_length_;
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uint32_t cuckoo_block_size_;
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uint32_t cuckoo_block_bytes_minus_one_;
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uint64_t table_size_;
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const Comparator* ucomp_;
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uint64_t (*get_slice_hash_)(const Slice& s, uint32_t index,
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uint64_t max_num_buckets);
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};
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} // namespace ROCKSDB_NAMESPACE
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