Add array cache repository to reduce load on cache backend

lib/Alchemy/Phrasea/Databox/ArrayCacheDataboxRepository.php

@@ -0,0 +1,73 @@
+<?php
+
+namespace Alchemy\Phrasea\Databox;
+
+class ArrayCacheDataboxRepository implements DataboxRepository
+{
+    /**
+     * @var DataboxRepository
+     */
+    private $repository;
+
+    /**
+     * @var bool
+     */
+    private $loaded = false;
+
+    /**
+     * @var \databox[]
+     */
+    private $databoxes = [];
+
+    /**
+     * @param DataboxRepository $repository
+     */
+    public function __construct(DataboxRepository $repository)
+    {
+        $this->repository = $repository;
+    }
+
+    /**
+     * @param int $id
+     * @return \databox
+     */
+    public function find($id)
+    {
+        $this->load();
+
+        if (! isset($this->databoxes[$id])) {
+            return null;
+        }
+
+        return $this->databoxes[$id];
+    }
+
+    /**
+     * @return \databox[]
+     */
+    public function findAll()
+    {
+        $this->load();
+
+        return $this->databoxes;
+    }
+
+    /**
+     * @param \databox $databox
+     */
+    public function save(\databox $databox)
+    {
+        $this->loaded = false;
+        $this->databoxes = [];
+
+        return $this->repository->save($databox);
+    }
+
+    private function load()
+    {
+        if (! $this->loaded) {
+            $this->databoxes = $this->repository->findAll();
+            $this->loaded = true;
+        }
+    }
+}