Support caching with Redis (#1009)

rainloop/v/0.0.0/app/libraries/Predis/Cluster/PredisStrategy.php

@@ -0,0 +1,79 @@
+<?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.
+ */
+
+namespace Predis\Cluster;
+
+use Predis\Cluster\Distributor\DistributorInterface;
+use Predis\Cluster\Distributor\HashRing;
+
+/**
+ * Default cluster strategy used by Predis to handle client-side sharding.
+ *
+ * @author Daniele Alessandri <suppakilla@gmail.com>
+ */
+class PredisStrategy extends ClusterStrategy
+{
+    protected $distributor;
+
+    /**
+     * @param DistributorInterface $distributor Optional distributor instance.
+     */
+    public function __construct(DistributorInterface $distributor = null)
+    {
+        parent::__construct();
+
+        $this->distributor = $distributor ?: new HashRing();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getSlotByKey($key)
+    {
+        $key = $this->extractKeyTag($key);
+        $hash = $this->distributor->hash($key);
+        $slot = $this->distributor->getSlot($hash);
+
+        return $slot;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function checkSameSlotForKeys(array $keys)
+    {
+        if (!$count = count($keys)) {
+            return false;
+        }
+
+        $currentKey = $this->extractKeyTag($keys[0]);
+
+        for ($i = 1; $i < $count; ++$i) {
+            $nextKey = $this->extractKeyTag($keys[$i]);
+
+            if ($currentKey !== $nextKey) {
+                return false;
+            }
+
+            $currentKey = $nextKey;
+        }
+
+        return true;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getDistributor()
+    {
+        return $this->distributor;
+    }
+}