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58 lines
1.3 KiB
PHP
58 lines
1.3 KiB
PHP
<?php
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/*
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* This file is part of the Predis package.
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*
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* (c) Daniele Alessandri <suppakilla@gmail.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Predis\Cluster;
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use Predis\Cluster\Hash\CRC16;
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use Predis\Cluster\Hash\HashGeneratorInterface;
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use Predis\NotSupportedException;
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/**
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* Default class used by Predis to calculate hashes out of keys of
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* commands supported by redis-cluster.
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*
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* @author Daniele Alessandri <suppakilla@gmail.com>
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*/
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class RedisStrategy extends ClusterStrategy
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{
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protected $hashGenerator;
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/**
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* @param HashGeneratorInterface $hashGenerator Hash generator instance.
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*/
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public function __construct(HashGeneratorInterface $hashGenerator = null)
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{
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parent::__construct();
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$this->hashGenerator = $hashGenerator ?: new CRC16();
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}
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/**
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* {@inheritdoc}
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*/
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public function getSlotByKey($key)
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{
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$key = $this->extractKeyTag($key);
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$slot = $this->hashGenerator->hash($key) & 0x3FFF;
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return $slot;
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}
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/**
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* {@inheritdoc}
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*/
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public function getDistributor()
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{
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throw new NotSupportedException(
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'This cluster strategy does not provide an external distributor'
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);
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}
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}
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