/
CustomDistributionStrategy.php
82 lines (65 loc) · 2.03 KB
/
CustomDistributionStrategy.php
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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.
*/
require 'SharedConfigurations.php';
// Developers can customize the distribution strategy used by the client
// to distribute keys among a cluster of servers simply by creating a class
// that implements Predis\Distribution\DistributionStrategyInterface.
use Predis\Distribution\DistributionStrategyInterface;
use Predis\Connection\PredisCluster;
class NaiveDistributionStrategy implements DistributionStrategyInterface
{
private $nodes;
private $nodesCount;
public function __constructor()
{
$this->nodes = array();
$this->nodesCount = 0;
}
public function add($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 get($key)
{
$count = $this->nodesCount;
if ($count === 0) {
throw new RuntimeException('No connections');
}
return $this->nodes[$count > 1 ? abs(crc32($key) % $count) : 0];
}
public function hash($value)
{
return crc32($value);
}
}
$options = array(
'cluster' => function() {
$distributor = new NaiveDistributionStrategy();
return new PredisCluster($distributor);
},
);
$client = new Predis\Client($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->getClientFor('first')->info();
$server2 = $client->getClientFor('second')->info();
printf("Server '%s' has %d keys while server '%s' has %d keys.\n",
'first', $server1['db15']['keys'], 'second', $server2['db15']['keys']
);