Create Predis\Cluster namespace and move related classes / interfaces.

lib/Predis/Cluster/Hash/HashGeneratorInterface.php

@@ -0,0 +1,29 @@
+<?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\Hash;
+
+/**
+ * A generator of node keys implements the logic used to calculate the hash of
+ * a key to distribute the respective operations among nodes.
+ *
+ * @author Daniele Alessandri <suppakilla@gmail.com>
+ */
+interface HashGeneratorInterface
+{
+    /**
+     * Generates an hash that is used by the distributor algorithm
+     *
+     * @param string $value Value used to generate the hash.
+     * @return int
+     */
+    public function hash($value);
+}