118 lines
2.7 KiB
PHP
118 lines
2.7 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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require __DIR__.'/shared.php';
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// Developers can implement Predis\Distribution\DistributorInterface to create
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// their own distributors used by the client to distribute keys among a cluster
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// of servers.
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use Predis\Cluster\Distributor\DistributorInterface;
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use Predis\Cluster\Hash\HashGeneratorInterface;
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use Predis\Cluster\PredisStrategy;
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use Predis\Connection\Aggregate\PredisCluster;
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class NaiveDistributor implements DistributorInterface, 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($this->nodes);
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}
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public function getSlot($hash)
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{
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return $this->nodesCount > 1 ? abs($hash % $this->nodesCount) : 0;
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}
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public function getBySlot($slot)
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{
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return isset($this->nodes[$slot]) ? $this->nodes[$slot] : null;
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}
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public function getByHash($hash)
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{
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if (!$this->nodesCount) {
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throw new RuntimeException('No connections.');
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}
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$slot = $this->getSlot($hash);
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$node = $this->getBySlot($slot);
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return $node;
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}
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public function get($value)
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{
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$hash = $this->hash($value);
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$node = $this->getByHash($hash);
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return $node;
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}
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public function hash($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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$distributor = new NaiveDistributor();
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$strategy = new PredisStrategy($distributor);
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$cluster = new PredisCluster($strategy);
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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 = $client->getClientFor('second')->info();
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if (isset($server1['Keyspace'], $server2['Keyspace'])) {
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$server1 = $server1['Keyspace'];
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$server2 = $server2['Keyspace'];
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}
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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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