a1dcddd300
these unused includes were identified by clangd. see https://clangd.llvm.org/guides/include-cleaner#unused-include-warning for more details on the "Unused include" warning. Signed-off-by: Kefu Chai <kefu.chai@scylladb.com> Closes scylladb/scylladb#16833
87 lines
2.5 KiB
C++
87 lines
2.5 KiB
C++
/*
|
|
* Copyright (C) 2015-present ScyllaDB
|
|
*
|
|
* Modified by ScyllaDB
|
|
*/
|
|
|
|
/*
|
|
* SPDX-License-Identifier: (AGPL-3.0-or-later and Apache-2.0)
|
|
*/
|
|
|
|
#include "i_filter.hh"
|
|
#include "bytes.hh"
|
|
#include <seastar/core/shared_ptr.hh>
|
|
#include <seastar/core/align.hh>
|
|
#include <seastar/core/loop.hh>
|
|
#include "utils/large_bitset.hh"
|
|
#include <array>
|
|
#include <cstdlib>
|
|
#include "utils/bloom_calculations.hh"
|
|
#include "bloom_filter.hh"
|
|
|
|
namespace utils {
|
|
namespace filter {
|
|
|
|
thread_local bloom_filter::stats bloom_filter::_shard_stats;
|
|
|
|
template<typename Func>
|
|
void for_each_index(hashed_key hk, int count, int64_t max, filter_format format, Func&& func) {
|
|
auto h = hk.hash();
|
|
int64_t base = (format == filter_format::k_l_format) ? h[0] : h[1];
|
|
int64_t inc = (format == filter_format::k_l_format) ? h[1] : h[0];
|
|
for (int i = 0; i < count; i++) {
|
|
if (func(std::abs(base % max)) == stop_iteration::yes) {
|
|
break;
|
|
}
|
|
base = static_cast<int64_t>(static_cast<uint64_t>(base) + static_cast<uint64_t>(inc));
|
|
}
|
|
}
|
|
|
|
bloom_filter::bloom_filter(int hashes, bitmap&& bs, filter_format format) noexcept
|
|
: _bitset(std::move(bs))
|
|
, _hash_count(hashes)
|
|
, _format(format)
|
|
{
|
|
_stats.memory_size += memory_size();
|
|
}
|
|
|
|
bloom_filter::~bloom_filter() noexcept {
|
|
_stats.memory_size -= memory_size();
|
|
}
|
|
|
|
bool bloom_filter::is_present(hashed_key key) {
|
|
bool result = true;
|
|
for_each_index(key, _hash_count, _bitset.size(), _format, [this, &result] (auto i) {
|
|
if (!_bitset.test(i)) {
|
|
result = false;
|
|
return stop_iteration::yes;
|
|
}
|
|
return stop_iteration::no;
|
|
});
|
|
return result;
|
|
}
|
|
|
|
void bloom_filter::add(const bytes_view& key) {
|
|
for_each_index(make_hashed_key(key), _hash_count, _bitset.size(), _format, [this] (auto i) {
|
|
_bitset.set(i);
|
|
return stop_iteration::no;
|
|
});
|
|
}
|
|
|
|
bool bloom_filter::is_present(const bytes_view& key) {
|
|
return is_present(make_hashed_key(key));
|
|
}
|
|
|
|
filter_ptr create_filter(int hash, large_bitset&& bitset, filter_format format) {
|
|
return std::make_unique<murmur3_bloom_filter>(hash, std::move(bitset), format);
|
|
}
|
|
|
|
filter_ptr create_filter(int hash, int64_t num_elements, int buckets_per, filter_format format) {
|
|
int64_t num_bits = (num_elements * buckets_per) + bloom_calculations::EXCESS;
|
|
num_bits = align_up<int64_t>(num_bits, 64); // Seems to be implied in origin
|
|
large_bitset bitset(num_bits);
|
|
return std::make_unique<murmur3_bloom_filter>(hash, std::move(bitset), format);
|
|
}
|
|
}
|
|
}
|