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<?php
/*
* This file is part of the Predis package.
*
* (c) 2009-2020 Daniele Alessandri
* (c) 2021-2025 Till Krüss
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
require __DIR__ . '/shared.php';
// Developers can implement Predis\Distribution\DistributorInterface to create
// their own distributors used by the client to distribute keys among a cluster
// of servers.
use Predis\Cluster\Distributor\DistributorInterface;
use Predis\Cluster\Hash\HashGeneratorInterface;
use Predis\Cluster\PredisStrategy;
use Predis\Connection\Cluster\PredisCluster;
class NaiveDistributor implements DistributorInterface, HashGeneratorInterface
{
private $nodes;
private $nodesCount;
public function __construct()
{
$this->nodes = [];
$this->nodesCount = 0;
}
public function add($node, $weight = null)
{
$this->nodes[] = $node;
++$this->nodesCount;
}
public function remove($node)
{
$this->nodes = array_filter($this->nodes, function ($n) use ($node) {
return $n !== $node;
});
$this->nodesCount = count($this->nodes);
}
public function getSlot($hash)
{
return $this->nodesCount > 1 ? abs($hash % $this->nodesCount) : 0;
}
public function getBySlot($slot)
{
return $this->nodes[$slot] ?? null;
}
public function getByHash($hash)
{
if (!$this->nodesCount) {
throw new RuntimeException('No connections.');
}
$slot = $this->getSlot($hash);
$node = $this->getBySlot($slot);
return $node;
}
public function get($value)
{
$hash = $this->hash($value);
$node = $this->getByHash($hash);
return $node;
}
public function hash($value)
{
return crc32($value);
}
public function getHashGenerator()
{
return $this;
}
}
$options = [
'cluster' => function () {
$distributor = new NaiveDistributor();
$strategy = new PredisStrategy($distributor);
$cluster = new PredisCluster($strategy);
return $cluster;
},
];
$client = new Predis\Client($multiple_servers, $options);
for ($i = 0; $i < 100; ++$i) {
$client->set("key:$i", str_pad($i, 4, '0', 0));
$client->get("key:$i");
}
$server1 = $client->getClientBy('alias', 'first')->info();
$server2 = $client->getClientBy('alias', 'second')->info();
if (isset($server1['Keyspace'], $server2['Keyspace'])) {
$server1 = $server1['Keyspace'];
$server2 = $server2['Keyspace'];
}
printf("Server '%s' has %d keys while server '%s' has %d keys.\n",
'first', $server1['db15']['keys'], 'second', $server2['db15']['keys']
);
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