MC-33275: Stale cache implementation

Author: vzabaznov

lib/internal/Magento/Framework/Cache/Backend/RemoteSynchronizedCache.php

@@ -51,7 +51,6 @@ class RemoteSynchronizedCache extends \Zend_Cache_Backend implements \Zend_Cache
      */
     private const REMOTE_SYNC_LOCK_PREFIX = 'rsl::';
 
-
     /**
      * @inheritdoc
      */
@@ -398,10 +397,10 @@ private function unlock(string $id): bool
     /**
      * Calculate lock name.
      *
-     * @param $id
+     * @param string $id
      * @return string
      */
-    private function getLockName($id): string
+    private function getLockName(string $id): string
     {
         return self::REMOTE_SYNC_LOCK_PREFIX . $id;
     }
@@ -451,6 +450,9 @@ private function generateLockSign()
         return $sign;
     }
 
+    /**
+     * Function that notifies configured cache types to be switched off.
+     */
     private function notifyStaleCache(): void
     {
         $this->notifier = $this->notifier ??

setup/src/Magento/Setup/Model/ConfigOptionsList/Cache.php

@@ -22,7 +22,7 @@
 class Cache implements ConfigOptionsListInterface
 {
     const INPUT_VALUE_CACHE_REDIS = 'redis';
-    const CONFIG_VALUE_CACHE_REDIS = '\\Magento\\Framework\\Cache\\Backend\Redis';
+    const CONFIG_VALUE_CACHE_REDIS = \Magento\Framework\Cache\Backend\Redis::class;
 
     const INPUT_KEY_CACHE_BACKEND = 'cache-backend';
     const INPUT_KEY_CACHE_BACKEND_REDIS_SERVER = 'cache-backend-redis-server';
@@ -44,7 +44,6 @@ class Cache implements ConfigOptionsListInterface
     const CONFIG_PATH_CACHE_ID_PREFIX = 'cache/frontend/default/id_prefix';
     const CONFIG_PATH_ALLOW_PARALLEL_CACHE_GENERATION = 'cache/allow_parallel_generation';
 
-
     /**
      * @var array
      */
@@ -98,6 +97,7 @@ public function __construct(RedisConnectionValidator $redisValidator)
      */
     public function getOptions()
     {
+        $a = \Magento\Framework\Cache\Backend\Redis::class;
         return [
             new SelectConfigOption(
                 self::INPUT_KEY_CACHE_BACKEND,

setup/src/Magento/Setup/Model/ConfigOptionsList/PageCache.php

@@ -20,7 +20,7 @@
 class PageCache implements ConfigOptionsListInterface
 {
     const INPUT_VALUE_PAGE_CACHE_REDIS = 'redis';
-    const CONFIG_VALUE_PAGE_CACHE_REDIS = '\\Magento\\Framework\\Cache\\Backend\Redis';
+    const CONFIG_VALUE_PAGE_CACHE_REDIS = \Magento\Framework\Cache\Backend\Redis::class;
 
     const INPUT_KEY_PAGE_CACHE_BACKEND = 'page-cache';
     const INPUT_KEY_PAGE_CACHE_BACKEND_REDIS_SERVER = 'page-cache-redis-server';