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