Issue #2039521 by Berdir, tim.plunkett: Convert FilterPluginManager to extend DefaultPluginManager.

core/lib/Drupal/Core/Plugin/DefaultPluginManager.php

@@ -52,6 +52,13 @@ class DefaultPluginManager extends PluginManagerBase implements PluginManagerInt
    */
   protected $cacheKey;
 
+  /**
+   * An array of cache tags to use for the cached definitions.
+   *
+   * @var array
+   */
+  protected $cacheTags = array();
+
   /**
    * Name of the alter hook if one should be invoked.
    *
@@ -116,12 +123,16 @@ public function __construct($subdir, \Traversable $namespaces, $annotation_names
    * @param string $cache_key_prefix
    *   Cache key prefix to use, the language code will be appended
    *   automatically.
+   * @param array $cache_tags
+   *   (optional) When providing a list of cache tags, the cached definitions
+   *   are tagged and are used to clear the cache.
    */
-  public function setCacheBackend(CacheBackendInterface $cache_backend, LanguageManager $language_manager, $cache_key_prefix) {
+  public function setCacheBackend(CacheBackendInterface $cache_backend, LanguageManager $language_manager, $cache_key_prefix, array $cache_tags = array()) {
     $this->languageManager = $language_manager;
     $this->cacheBackend = $cache_backend;
     $this->cacheKeyPrefix = $cache_key_prefix;
     $this->cacheKey = $cache_key_prefix . ':' . $language_manager->getLanguage(Language::TYPE_INTERFACE)->id;
+    $this->cacheTags = $cache_tags;
   }
 
   /**
@@ -169,12 +180,18 @@ public function getDefinitions() {
    */
   public function clearCachedDefinitions() {
     if ($this->cacheBackend) {
-      $cache_keys = array();
-      // @todo: Use $this->languageManager->languageList() after http://drupal.org/node/1862202 is in.
-      foreach (language_list() as $langcode => $language) {
-        $cache_keys[] = $this->cacheKeyPrefix . ':' .$langcode;
+      if ($this->cacheTags) {
+        // Use the cache tags to clear the cache.
+        $this->cacheBackend->deleteTags($this->cacheTags);
+      }
+      else {
+        $cache_keys = array();
+        // @todo: Use $this->languageManager->languageList() after http://drupal.org/node/1862202 is in.
+        foreach (language_list() as $langcode => $language) {
+          $cache_keys[] = $this->cacheKeyPrefix . ':' .$langcode;
+        }
+        $this->cacheBackend->deleteMultiple($cache_keys);
       }
-      $this->cacheBackend->deleteMultiple($cache_keys);
     }
     $this->definitions = NULL;
   }
@@ -203,7 +220,7 @@ protected function getCachedDefinitions() {
    */
   protected function setCachedDefinitions($definitions) {
     if ($this->cacheBackend) {
-      $this->cacheBackend->set($this->cacheKey, $definitions);
+      $this->cacheBackend->set($this->cacheKey, $definitions, CacheBackendInterface::CACHE_PERMANENT, $this->cacheTags);
     }
     $this->definitions = $definitions;
   }

core/modules/filter/filter.services.yml

@@ -16,4 +16,4 @@ services:
       - { name: access_check }
   plugin.manager.filter:
     class: Drupal\filter\FilterPluginManager
-    arguments: ['@container.namespaces']
+    arguments: ['@container.namespaces', '@cache.cache', '@language_manager', '@module_handler']

core/modules/filter/lib/Drupal/filter/FilterPluginManager.php

@@ -9,7 +9,10 @@
 
 use Drupal\Component\Plugin\PluginManagerBase;
 use Drupal\Core\Cache\CacheBackendInterface;
+use Drupal\Core\Extension\ModuleHandlerInterface;
 use Drupal\Core\Language\Language;
+use Drupal\Core\Language\LanguageManager;
+use Drupal\Core\Plugin\DefaultPluginManager;
 use Drupal\Core\Plugin\Discovery\AlterDecorator;
 use Drupal\Core\Plugin\Discovery\AnnotatedClassDiscovery;
 use Drupal\Core\Plugin\Discovery\CacheDecorator;
@@ -20,7 +23,7 @@
  *
  * @see hook_filter_info_alter()
  */
-class FilterPluginManager extends PluginManagerBase {
+class FilterPluginManager extends DefaultPluginManager {
 
   /**
    * Constructs a FilterPluginManager object.
@@ -28,16 +31,18 @@ class FilterPluginManager extends PluginManagerBase {
    * @param \Traversable $namespaces
    *   An object that implements \Traversable which contains the root paths
    *   keyed by the corresponding namespace to look for plugin implementations.
+   * @param \Drupal\Core\Cache\CacheBackendInterface $cache_backend
+   *   Cache backend instance to use.
+   * @param \Drupal\Core\Language\LanguageManager $language_manager
+   *   The language manager.
+   * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
+   *   The module handler to invoke the alter hook with.
    */
-  public function __construct(\Traversable $namespaces) {
+  public function __construct(\Traversable $namespaces, CacheBackendInterface $cache_backend, LanguageManager $language_manager, ModuleHandlerInterface $module_handler) {
     $annotation_namespaces = array('Drupal\filter\Annotation' => $namespaces['Drupal\filter']);
-    $this->discovery = new AnnotatedClassDiscovery('Plugin/Filter', $namespaces, $annotation_namespaces, 'Drupal\filter\Annotation\Filter');
-    $this->discovery = new AlterDecorator($this->discovery, 'filter_info');
-    $cache_key = 'filter_plugins:' . language(Language::TYPE_INTERFACE)->id;
-    $cache_tags = array('filter_formats' => TRUE);
-    $this->discovery = new CacheDecorator($this->discovery, $cache_key, 'cache', CacheBackendInterface::CACHE_PERMANENT, $cache_tags);
-
-    $this->factory = new ContainerFactory($this);
+    parent::__construct('Plugin/Filter', $namespaces, $annotation_namespaces, 'Drupal\filter\Annotation\Filter');
+    $this->alterInfo($module_handler, 'filter_info');
+    $this->setCacheBackend($cache_backend, $language_manager, 'filter_plugins', array('filter_formats' => TRUE));
   }
 
   /**

core/tests/Drupal/Tests/Core/Plugin/DefaultPluginManagerTest.php

@@ -156,4 +156,33 @@ public function testDefaultPluginManagerWithFilledCache() {
     $this->assertEquals($this->expectedDefinitions, $plugin_manager->getDefinitions());
   }
 
+  /**
+   * Tests the plugin manager cache clear with tags.
+   */
+  public function testCacheClearWithTags() {
+    $cid = $this->randomName();
+    $cache_backend = $this->getMockBuilder('Drupal\Core\Cache\MemoryBackend')
+      ->disableOriginalConstructor()
+      ->getMock();
+    $cache_backend
+      ->expects($this->once())
+      ->method('deleteTags')
+      ->with(array('tag' => TRUE));
+    $cache_backend
+      ->expects($this->never())
+      ->method('deleteMultiple');
+
+    $language = new Language(array('id' => 'en'));
+    $language_manager = $this->getMock('Drupal\Core\Language\LanguageManager');
+    $language_manager->expects($this->once())
+      ->method('getLanguage')
+      ->with(Language::TYPE_INTERFACE)
+      ->will($this->returnValue($language));
+
+    $plugin_manager = new TestPluginManager($this->namespaces, $this->expectedDefinitions);
+    $plugin_manager->setCacheBackend($cache_backend, $language_manager, $cid, array('tag' => TRUE));
+
+    $plugin_manager->clearCachedDefinitions();
+  }
+
 }