All classes that implement MapperInterface in Plug 7
- class \Drupal\Component\Plugin\PluginManagerBase implements PluginManagerInterface uses DiscoveryTrait
- class \Drupal\Core\Plugin\DefaultPluginManager implements CachedDiscoveryInterface, PluginManagerInterface uses DiscoveryCachedTrait
- class \Drupal\plug_example\FruitPluginManager
- class \Drupal\plug_example\NamePluginManager