55 lines
2.1 KiB
C++
55 lines
2.1 KiB
C++
/*
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* Copyright (C) 2016 ScyllaDB
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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_partitioner.hh"
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#include "bytes.hh"
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#include "sstables/key.hh"
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namespace dht {
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class random_partitioner final : public i_partitioner {
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unsigned _shard_count;
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public:
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random_partitioner(unsigned shard_count = smp::count, unsigned ignore_msb = 0) : _shard_count(shard_count) {}
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virtual const sstring name() { return "org.apache.cassandra.dht.RandomPartitioner"; }
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virtual token get_token(const schema& s, partition_key_view key) override;
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virtual token get_token(const sstables::key_view& key) override;
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virtual token get_random_token() override;
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virtual bool preserves_order() override { return false; }
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virtual std::map<token, float> describe_ownership(const std::vector<token>& sorted_tokens) override;
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virtual data_type get_token_validator() override { return varint_type; }
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virtual bytes token_to_bytes(const token& t) const override;
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virtual int tri_compare(const token& t1, const token& t2) const override;
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virtual token midpoint(const token& t1, const token& t2) const;
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virtual sstring to_sstring(const dht::token& t) const override;
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virtual dht::token from_sstring(const sstring& t) const override;
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virtual dht::token from_bytes(bytes_view bytes) const override;
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virtual unsigned shard_of(const token& t) const override;
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virtual token token_for_next_shard(const token& t) const override;
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private:
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token get_token(bytes data);
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};
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}
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