diff --git a/core/lib/Drupal/Core/Cache/Static/StaticCache.php b/core/lib/Drupal/Core/Cache/Static/StaticCache.php
new file mode 100644
index 0000000..cabc8a1
--- /dev/null
+++ b/core/lib/Drupal/Core/Cache/Static/StaticCache.php
@@ -0,0 +1,63 @@
+<?php
+
+namespace Drupal\Core\Cache\Static;
+
+use Drupal\Core\Cache\MemoryBackend;
+
+/**
+ * Defines a static cache implementation.
+ *
+ * Stores cache items in memory using a PHP array.
+ *
+ * @ingroup cache
+ */
+class StaticCache extends MemoryBackend implements StaticCacheInterface {
+
+  /**
+   * Prepares a cached item.
+   *
+   * Checks that items are either permanent or did not expire, and returns data
+   * as appropriate.
+   *
+   * @param object $cache
+   *   An item loaded from cache_get() or cache_get_multiple().
+   * @param bool $allow_invalid
+   *   (optional) If TRUE, cache items may be returned even if they have expired
+   *   or been invalidated.
+   *
+   * @return mixed
+   *   The item with data as appropriate or FALSE if there is no
+   *   valid item to load.
+   */
+  protected function prepareItem($cache, $allow_invalid) {
+    if (!isset($cache->data)) {
+      return FALSE;
+    }
+    // Check expire time.
+    $cache->valid = $cache->expire == Cache::PERMANENT || $cache->expire >= $this->getRequestTime();
+
+    if (!$allow_invalid && !$prepared->valid) {
+      return FALSE;
+    }
+
+    return $cache;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function set($cid, $data, $expire = Cache::PERMANENT, array $tags = array()) {
+    assert('\Drupal\Component\Assertion\Inspector::assertAllStrings($tags)', 'Cache Tags must be strings.');
+    $tags = array_unique($tags);
+    // Sort the cache tags so that they are stored consistently in the database.
+    sort($tags);
+    $this->cache[$cid] = (object) array(
+      'cid' => $cid,
+      'data' => $data,
+      'created' => $this->getRequestTime(),
+      'expire' => $expire,
+      'tags' => $tags,
+    );
+  }
+
+}
diff --git a/core/lib/Drupal/Core/Cache/Static/StaticCacheInterface.php b/core/lib/Drupal/Core/Cache/Static/StaticCacheInterface.php
new file mode 100644
index 0000000..275ea13
--- /dev/null
+++ b/core/lib/Drupal/Core/Cache/Static/StaticCacheInterface.php
@@ -0,0 +1,18 @@
+<?php
+
+namespace Drupal\Core\Cache\Static;
+
+use Drupal\Core\Cache\CacheBackendInterface;
+use Drupal\Core\Cache\CacheTagsInvalidatorInterface;
+
+/**
+ * Defines an interface for static cache implementations.
+ *
+ * This has additional requirements over CacheBackendInterface and
+ * CacheTagsInvalidatorInterface. Objects stored must be the same instance when
+ * retrieved from cache, so that this can be used as a replacement for protected
+ * properties and similar.
+ *
+ * @ingroup cache
+ */
+interface StaticCacheInterface extends CacheBackendInterface, CacheTagsInvalidatorInterface {}