merge branch 'override_cache_backend' into dennis-8.x-2.x

Author: marcelovani

src/MemcacheServiceProvider.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace Drupal\memcache;
+
+use Drupal\Core\DependencyInjection\ContainerBuilder;
+use Drupal\Core\DependencyInjection\ServiceProviderBase;
+
+/**
+ * When Memcache module is enabled, set the backend cache to memcache.
+ */
+class MemcacheServiceProvider extends ServiceProviderBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function alter(ContainerBuilder $container) {
+    $definition = $container->getDefinition('cache.backend.chainedfast');
+    $arguments = $definition->getArguments();
+    $arguments[1] = 'cache.backend.memcache';
+    $definition->setArguments($arguments);
+    $container->setDefinition('cache.backend.chainedfast', $definition);
+  }
+}