Moved cache drivers outside core to extensions (plugins)

plugins/cache-redis/Predis/Response/Status.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\Response;
+
+/**
+ * Represents a status response returned by Redis.
+ *
+ * @author Daniele Alessandri <suppakilla@gmail.com>
+ */
+class Status implements ResponseInterface
+{
+    private static $OK;
+    private static $QUEUED;
+
+    private $payload;
+
+    /**
+     * @param string $payload Payload of the status response as returned by Redis.
+     */
+    public function __construct($payload)
+    {
+        $this->payload = $payload;
+    }
+
+    /**
+     * Converts the response object to its string representation.
+     *
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->payload;
+    }
+
+    /**
+     * Returns the payload of status response.
+     *
+     * @return string
+     */
+    public function getPayload()
+    {
+        return $this->payload;
+    }
+
+    /**
+     * Returns an instance of a status response object.
+     *
+     * Common status responses such as OK or QUEUED are cached in order to lower
+     * the global memory usage especially when using pipelines.
+     *
+     * @param string $payload Status response payload.
+     *
+     * @return string
+     */
+    public static function get($payload)
+    {
+        switch ($payload) {
+            case 'OK':
+            case 'QUEUED':
+                if (isset(self::$$payload)) {
+                    return self::$$payload;
+                }
+
+                return self::$$payload = new self($payload);
+
+            default:
+                return new self($payload);
+        }
+    }
+}