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<?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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require 'SharedConfigurations.php';
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// Developers can customize the distribution strategy used by the client
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// to distribute keys among a cluster of servers simply by creating a class
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// that implements Predis\Distribution\DistributionStrategyInterface.
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use Predis\Connection\PredisCluster;
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use Predis\Cluster\Distribution\DistributionStrategyInterface;
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use Predis\Cluster\Hash\HashGeneratorInterface;
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class NaiveDistributionStrategy implements DistributionStrategyInterface, HashGeneratorInterface
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{
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private $nodes;
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private $nodesCount;
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public function __construct()
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{
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$this->nodes = array();
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$this->nodesCount = 0;
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}
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public function add($node, $weight = null)
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{
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$this->nodes[] = $node;
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$this->nodesCount++;
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}
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public function remove($node)
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{
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$this->nodes = array_filter($this->nodes, function ($n) use ($node) {
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return $n !== $node;
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});
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$this->nodesCount = count($this->nodes);
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}
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public function get($key)
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{
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if (0 === $count = $this->nodesCount) {
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throw new RuntimeException('No connections');
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}
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return $this->nodes[$count > 1 ? abs($key % $count) : 0];
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}
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public function hash($value)
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{
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return crc32($value);
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}
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public function getHashGenerator()
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{
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return $this;
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}
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}
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$options = array(
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'cluster' => function () {
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$distributor = new NaiveDistributionStrategy();
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$cluster = new PredisCluster($distributor);
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return $cluster;
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},
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);
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$client = new Predis\Client($multiple_servers, $options);
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for ($i = 0; $i < 100; $i++) {
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$client->set("key:$i", str_pad($i, 4, '0', 0));
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$client->get("key:$i");
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}
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$server1 = $client->getClientFor('first')->info();
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$server2 = $client->getClientFor('second')->info();
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printf("Server '%s' has %d keys while server '%s' has %d keys.\n",
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'first', $server1['db15']['keys'], 'second', $server2['db15']['keys']
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);
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