e5477c6c6c
It better reflects the purpose of the parameter and provides better type-safety. Signed-off-by: Vladimir Krivopalov <vladimir@scylladb.com> Message-Id: <10a4fc16dafa0fb3234969041f68f9e7bfc61312.1525899669.git.vladimir@scylladb.com>
121 lines
3.3 KiB
C++
121 lines
3.3 KiB
C++
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* Copyright (C) 2015 ScyllaDB
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*
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* Modified by ScyllaDB
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*
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* This file contains code from a variety of .java files from the
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* Cassandra project, adapted to our needs.
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "i_filter.hh"
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#include "utils/murmur_hash.hh"
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#include "utils/large_bitset.hh"
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#include <vector>
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namespace utils {
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namespace filter {
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class bloom_filter: public i_filter {
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public:
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using bitmap = large_bitset;
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private:
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bitmap _bitset;
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int _hash_count;
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filter_format _format;
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public:
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int num_hashes() { return _hash_count; }
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bitmap& bits() { return _bitset; }
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bloom_filter(int hashes, bitmap&& bs, filter_format format)
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: _bitset(std::move(bs))
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, _hash_count(hashes)
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, _format(format)
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{}
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virtual void add(const bytes_view& key) override;
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virtual bool is_present(const bytes_view& key) override;
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virtual bool is_present(hashed_key key) override;
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virtual void clear() override {
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_bitset.clear();
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}
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virtual void close() override { }
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virtual size_t memory_size() override {
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return sizeof(_hash_count) + _bitset.memory_size();
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}
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};
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struct murmur3_bloom_filter: public bloom_filter {
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murmur3_bloom_filter(int hashes, bitmap&& bs, filter_format format)
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: bloom_filter(hashes, std::move(bs), format)
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{}
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};
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struct always_present_filter: public i_filter {
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virtual bool is_present(const bytes_view& key) override {
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return true;
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}
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virtual bool is_present(hashed_key key) override {
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return true;
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}
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virtual void add(const bytes_view& key) override { }
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virtual void clear() override { }
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virtual void close() override { }
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virtual size_t memory_size() override {
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return 0;
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}
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};
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filter_ptr create_filter(int hash, large_bitset&& bitset, filter_format format);
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filter_ptr create_filter(int hash, int64_t num_elements, int buckets_per, filter_format format);
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}
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}
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