5937b1fa23
After fcb8d040 ("treewide: use Software Package Data Exchange
(SPDX) license identifiers"), many dual-licensed files were
left with empty comments on top. Remove them to avoid visual
noise.
Closes #10562
97 lines
2.1 KiB
C++
97 lines
2.1 KiB
C++
/*
|
|
* Copyright (C) 2015-present ScyllaDB
|
|
*
|
|
* Modified by ScyllaDB
|
|
*
|
|
* This file contains code from a variety of .java files from the
|
|
* Cassandra project, adapted to our needs.
|
|
*/
|
|
|
|
/*
|
|
* SPDX-License-Identifier: (AGPL-3.0-or-later and Apache-2.0)
|
|
*/
|
|
#pragma once
|
|
#include "i_filter.hh"
|
|
#include "utils/murmur_hash.hh"
|
|
#include "utils/large_bitset.hh"
|
|
|
|
#include <vector>
|
|
|
|
namespace utils {
|
|
namespace filter {
|
|
|
|
class bloom_filter: public i_filter {
|
|
public:
|
|
using bitmap = large_bitset;
|
|
|
|
private:
|
|
bitmap _bitset;
|
|
int _hash_count;
|
|
filter_format _format;
|
|
|
|
static thread_local struct stats {
|
|
uint64_t memory_size = 0;
|
|
} _shard_stats;
|
|
stats& _stats = _shard_stats;
|
|
|
|
public:
|
|
int num_hashes() { return _hash_count; }
|
|
bitmap& bits() { return _bitset; }
|
|
|
|
bloom_filter(int hashes, bitmap&& bs, filter_format format) noexcept;
|
|
~bloom_filter() noexcept;
|
|
|
|
virtual void add(const bytes_view& key) override;
|
|
|
|
virtual bool is_present(const bytes_view& key) override;
|
|
|
|
virtual bool is_present(hashed_key key) override;
|
|
|
|
virtual void clear() override {
|
|
_bitset.clear();
|
|
}
|
|
|
|
virtual void close() override { }
|
|
|
|
virtual size_t memory_size() override {
|
|
return sizeof(_hash_count) + _bitset.memory_size();
|
|
}
|
|
|
|
static const stats& get_shard_stats() noexcept {
|
|
return _shard_stats;
|
|
}
|
|
};
|
|
|
|
struct murmur3_bloom_filter: public bloom_filter {
|
|
|
|
murmur3_bloom_filter(int hashes, bitmap&& bs, filter_format format)
|
|
: bloom_filter(hashes, std::move(bs), format)
|
|
{}
|
|
};
|
|
|
|
struct always_present_filter: public i_filter {
|
|
|
|
virtual bool is_present(const bytes_view& key) override {
|
|
return true;
|
|
}
|
|
|
|
virtual bool is_present(hashed_key key) override {
|
|
return true;
|
|
}
|
|
|
|
virtual void add(const bytes_view& key) override { }
|
|
|
|
virtual void clear() override { }
|
|
|
|
virtual void close() override { }
|
|
|
|
virtual size_t memory_size() override {
|
|
return 0;
|
|
}
|
|
};
|
|
|
|
filter_ptr create_filter(int hash, large_bitset&& bitset, filter_format format);
|
|
filter_ptr create_filter(int hash, int64_t num_elements, int buckets_per, filter_format format);
|
|
}
|
|
}
|