fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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139 lines
5.5 KiB
139 lines
5.5 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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#pragma once
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#include <stddef.h>
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#include <stdint.h>
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#include <memory>
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#include <string>
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#include <vector>
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#include "db/dbformat.h"
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#include "rocksdb/options.h"
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#include "rocksdb/slice.h"
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#include "rocksdb/slice_transform.h"
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#include "table/block_based/filter_block_reader_common.h"
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#include "table/block_based/parsed_full_filter_block.h"
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#include "util/hash.h"
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namespace ROCKSDB_NAMESPACE {
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class FilterPolicy;
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class FilterBitsBuilder;
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class FilterBitsReader;
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// A FullFilterBlockBuilder is used to construct a full filter for a
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// particular Table. It generates a single string which is stored as
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// a special block in the Table.
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// The format of full filter block is:
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// +----------------------------------------------------------------+
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// | full filter for all keys in sst file |
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// +----------------------------------------------------------------+
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// The full filter can be very large. At the end of it, we put
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// num_probes: how many hash functions are used in bloom filter
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//
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class FullFilterBlockBuilder : public FilterBlockBuilder {
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public:
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explicit FullFilterBlockBuilder(const SliceTransform* prefix_extractor,
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bool whole_key_filtering,
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FilterBitsBuilder* filter_bits_builder);
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// No copying allowed
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FullFilterBlockBuilder(const FullFilterBlockBuilder&) = delete;
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void operator=(const FullFilterBlockBuilder&) = delete;
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// bits_builder is created in filter_policy, it should be passed in here
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// directly. and be deleted here
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~FullFilterBlockBuilder() {}
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virtual bool IsBlockBased() override { return false; }
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virtual void StartBlock(uint64_t /*block_offset*/) override {}
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virtual void Add(const Slice& key) override;
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virtual size_t NumAdded() const override { return num_added_; }
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virtual Slice Finish(const BlockHandle& tmp, Status* status) override;
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using FilterBlockBuilder::Finish;
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protected:
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virtual void AddKey(const Slice& key);
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std::unique_ptr<FilterBitsBuilder> filter_bits_builder_;
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virtual void Reset();
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void AddPrefix(const Slice& key);
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const SliceTransform* prefix_extractor() { return prefix_extractor_; }
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private:
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// important: all of these might point to invalid addresses
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// at the time of destruction of this filter block. destructor
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// should NOT dereference them.
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const SliceTransform* prefix_extractor_;
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bool whole_key_filtering_;
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bool last_whole_key_recorded_;
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std::string last_whole_key_str_;
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bool last_prefix_recorded_;
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std::string last_prefix_str_;
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uint32_t num_added_;
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std::unique_ptr<const char[]> filter_data_;
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};
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// A FilterBlockReader is used to parse filter from SST table.
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// KeyMayMatch and PrefixMayMatch would trigger filter checking
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class FullFilterBlockReader
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: public FilterBlockReaderCommon<ParsedFullFilterBlock> {
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public:
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FullFilterBlockReader(const BlockBasedTable* t,
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CachableEntry<ParsedFullFilterBlock>&& filter_block);
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static std::unique_ptr<FilterBlockReader> Create(
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const BlockBasedTable* table, FilePrefetchBuffer* prefetch_buffer,
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bool use_cache, bool prefetch, bool pin,
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BlockCacheLookupContext* lookup_context);
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bool IsBlockBased() override { return false; }
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bool KeyMayMatch(const Slice& key, const SliceTransform* prefix_extractor,
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uint64_t block_offset, const bool no_io,
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const Slice* const const_ikey_ptr, GetContext* get_context,
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BlockCacheLookupContext* lookup_context) override;
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bool PrefixMayMatch(const Slice& prefix,
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const SliceTransform* prefix_extractor,
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uint64_t block_offset, const bool no_io,
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const Slice* const const_ikey_ptr,
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GetContext* get_context,
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BlockCacheLookupContext* lookup_context) override;
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void KeysMayMatch(MultiGetRange* range,
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const SliceTransform* prefix_extractor,
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uint64_t block_offset, const bool no_io,
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BlockCacheLookupContext* lookup_context) override;
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void PrefixesMayMatch(MultiGetRange* range,
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const SliceTransform* prefix_extractor,
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uint64_t block_offset, const bool no_io,
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BlockCacheLookupContext* lookup_context) override;
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size_t ApproximateMemoryUsage() const override;
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bool RangeMayExist(const Slice* iterate_upper_bound, const Slice& user_key,
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const SliceTransform* prefix_extractor,
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const Comparator* comparator,
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const Slice* const const_ikey_ptr, bool* filter_checked,
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bool need_upper_bound_check, bool no_io,
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BlockCacheLookupContext* lookup_context) override;
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private:
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bool MayMatch(const Slice& entry, bool no_io, GetContext* get_context,
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BlockCacheLookupContext* lookup_context) const;
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void MayMatch(MultiGetRange* range, bool no_io,
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const SliceTransform* prefix_extractor,
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BlockCacheLookupContext* lookup_context) const;
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bool IsFilterCompatible(const Slice* iterate_upper_bound, const Slice& prefix,
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const Comparator* comparator) const;
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private:
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bool full_length_enabled_;
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size_t prefix_extractor_full_length_;
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};
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} // namespace ROCKSDB_NAMESPACE
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