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59 lines
1.9 KiB
C++
59 lines
1.9 KiB
C++
/*
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* Copyright (C) 2015 Cloudius Systems, Ltd.
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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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#include "byte_ordered_partitioner.hh"
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#include "utils/class_registrator.hh"
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namespace dht {
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token byte_ordered_partitioner::get_random_token()
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{
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bytes b(bytes::initialized_later(), 16);
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*unaligned_cast<uint64_t>(b.begin()) = dht::get_random_number<uint64_t>();
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*unaligned_cast<uint64_t>(b.begin() + 8) = dht::get_random_number<uint64_t>();
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return token(token::kind::key, std::move(b));
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}
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std::map<token, float> byte_ordered_partitioner::describe_ownership(const std::vector<token>& sorted_tokens)
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{
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throw std::runtime_error("not implemented");
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}
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token byte_ordered_partitioner::midpoint(const token& t1, const token& t2) const
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{
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throw std::runtime_error("not implemented");
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}
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unsigned
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byte_ordered_partitioner::shard_of(const token& t) const {
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if (t._data.empty()) {
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return 0;
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}
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// treat first byte as a fraction in the range [0, 1) and divide it evenly:
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return (uint8_t(t._data[0]) * smp::count) >> 8;
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}
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using registry = class_registrator<i_partitioner, byte_ordered_partitioner>;
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static registry registrator("org.apache.cassandra.dht.ByteOrderedPartitioner");
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static registry registrator_short_name("ByteOrderedPartitioner");
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}
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