Moved cache drivers outside core to extensions (plugins)

plugins/cache-redis/Predis/Cluster/StrategyInterface.php

@@ -0,0 +1,53 @@
+<?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\Command\CommandInterface;
+
+/**
+ * Interface for classes defining the strategy used to calculate an hash out of
+ * keys extracted from supported commands.
+ *
+ * This is mostly useful to support clustering via client-side sharding.
+ *
+ * @author Daniele Alessandri <suppakilla@gmail.com>
+ */
+interface StrategyInterface
+{
+    /**
+     * Returns a slot for the given command used for clustering distribution or
+     * NULL when this is not possible.
+     *
+     * @param CommandInterface $command Command instance.
+     *
+     * @return int
+     */
+    public function getSlot(CommandInterface $command);
+
+    /**
+     * Returns a slot for the given key used for clustering distribution or NULL
+     * when this is not possible.
+     *
+     * @param string $key Key string.
+     *
+     * @return int
+     */
+    public function getSlotByKey($key);
+
+    /**
+     * Returns a distributor instance to be used by the cluster.
+     *
+     * @return DistributorInterface
+     */
+    public function getDistributor();
+}