diff core/lib/Drupal/Core/Cache/UseCacheBackendTrait.php @ 0:4c8ae668cc8c

Initial import (non-working)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/lib/Drupal/Core/Cache/UseCacheBackendTrait.php	Wed Nov 29 16:09:58 2017 +0000
@@ -0,0 +1,75 @@
+<?php
+
+namespace Drupal\Core\Cache;
+
+/**
+ * Provides methods to use a cache backend while respecting a 'use caches' flag.
+ */
+trait UseCacheBackendTrait {
+
+  /**
+   * Cache backend instance.
+   *
+   * @var \Drupal\Core\Cache\CacheBackendInterface
+   */
+  protected $cacheBackend;
+
+  /**
+   * Flag whether caches should be used or skipped.
+   *
+   * @var bool
+   */
+  protected $useCaches = TRUE;
+
+  /**
+   * Fetches from the cache backend, respecting the use caches flag.
+   *
+   * @param string $cid
+   *   The cache ID of the data to retrieve.
+   *
+   * @return object|false
+   *   The cache item or FALSE on failure.
+   *
+   * @see \Drupal\Core\Cache\CacheBackendInterface::get()
+   */
+  protected function cacheGet($cid) {
+    if ($this->useCaches && $this->cacheBackend) {
+      return $this->cacheBackend->get($cid);
+    }
+    return FALSE;
+  }
+
+  /**
+   * Stores data in the persistent cache, respecting the use caches flag.
+   *
+   * @param string $cid
+   *   The cache ID of the data to store.
+   * @param mixed $data
+   *   The data to store in the cache.
+   *   Some storage engines only allow objects up to a maximum of 1MB in size to
+   *   be stored by default. When caching large arrays or similar, take care to
+   *   ensure $data does not exceed this size.
+   * @param int $expire
+   *   One of the following values:
+   *   - CacheBackendInterface::CACHE_PERMANENT: Indicates that the item should
+   *     not be removed unless it is deleted explicitly.
+   *   - A Unix timestamp: Indicates that the item will be considered invalid
+   *     after this time, i.e. it will not be returned by get() unless
+   *     $allow_invalid has been set to TRUE. When the item has expired, it may
+   *     be permanently deleted by the garbage collector at any time.
+   * @param array $tags
+   *   An array of tags to be stored with the cache item. These should normally
+   *   identify objects used to build the cache item, which should trigger
+   *   cache invalidation when updated. For example if a cached item represents
+   *   a node, both the node ID and the author's user ID might be passed in as
+   *   tags. For example array('node' => array(123), 'user' => array(92)).
+   *
+   * @see \Drupal\Core\Cache\CacheBackendInterface::set()
+   */
+  protected function cacheSet($cid, $data, $expire = Cache::PERMANENT, array $tags = []) {
+    if ($this->cacheBackend && $this->useCaches) {
+      $this->cacheBackend->set($cid, $data, $expire, $tags);
+    }
+  }
+
+}