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@@ -0,0 +1,65 @@
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+<?php
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+require '../lib/Predis.php';
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+
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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 the Predis\Distribution\IDistributionAlgorithm interface.
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+
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+class NaiveDistributionStrategy
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+ implements Predis\Distribution\IDistributionStrategy {
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+
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+ private $_nodes, $_nodesCount;
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+
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+ public function __constructor() {
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+ $this->_nodes = array();
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+ $this->_nodesCount = 0;
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+ }
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+
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+ public function add($node, $weight = null) {
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+ $this->_nodes[] = $node;
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+ $this->_nodesCount++;
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+ }
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+
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+ public function remove($node) {
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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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+
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+ public function get($key) {
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+ $count = $this->_nodesCount;
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+ if ($count === 0) {
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+ throw new RuntimeException('No connections');
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+ }
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+ return $this->_nodes[$count > 1 ? abs(crc32($key) % $count) : 0];
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+ }
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+
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+ public function generateKey($value) {
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+ return crc32($value);
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+ }
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+}
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+
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+$servers = array(
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+ 'redis://127.0.0.1:6379?alias=first',
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+ 'redis://127.0.0.1:6380?alias=second',
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+);
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+
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+$options = array(
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+ 'key_distribution' => new NaiveDistributionStrategy(),
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+);
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+
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+$redis = new Predis\Client($servers, $options);
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+
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+for ($i = 0; $i < 100; $i++) {
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+ $redis->set("key:$i", str_pad($i, 4, '0', 0));
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+ $redis->get("key:$i");
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+}
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+
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+$server1 = $redis->getClientFor('first')->info();
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+$server2 = $redis->getClientFor('second')->info();
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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['db0']['keys'], 'second', $server2['db0']['keys']
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+);
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+?>
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