Build a caching repository decorator for settings

src/Core/Settings/CachedSettingsRepository.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace Flarum\Core\Settings;
+
+class CachedSettingsRepository implements SettingsRepository
+{
+    protected $inner;
+
+    protected $isCached;
+
+    protected $cache = [];
+
+    public function __construct(SettingsRepository $inner)
+    {
+        $this->inner = $inner;
+    }
+
+    public function all()
+    {
+        if (!$this->isCached) {
+            $this->cache = $this->inner->all();
+            $this->isCached = true;
+        }
+
+        return $this->cache;
+    }
+
+    public function get($key, $default = null)
+    {
+        if (array_key_exists($key, $this->cache)) {
+            return $this->cache[$key];
+        } else if (!$this->isCached) {
+            return array_get($this->all(), $key, $default);
+        }
+
+        return $default;
+    }
+
+    public function set($key, $value)
+    {
+        $this->cache[$key] = $value;
+
+        $this->inner->set($key, $value);
+    }
+}