removed/moved newly added patterns

More/Repository/MemoryStorage.php

@@ -0,0 +1,54 @@
+<?php
+
+namespace DesignPatterns\Repository;
+
+/**
+ * Class MemoryStorage
+ * @package DesignPatterns\Repository
+ */
+class MemoryStorage implements Storage
+{
+
+    private $data;
+    private $lastId;
+
+    public function __construct()
+    {
+        $this->data = array();
+        $this->lastId = 0;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function persist($data)
+    {
+        $this->data[++$this->lastId] = $data;
+        return $this->lastId;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function retrieve($id)
+    {
+        return isset($this->data[$id]) ? $this->data[$id] : null;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function delete($id)
+    {
+        if(!isset($this->data[$id])){
+            return false;
+        }
+
+        $this->data[$id] = null;
+        unset($this->data[$id]);
+
+        return true;
+    }
+
+}
+