Everywhere!

$ drupal list | grep plugin | wc -l
21

$ drupal dpl | wc -l
53

?

Define

Plugins designed as easy to embed objects into system

Write meta-information

define()

Plug & Play

/**
 * @DataType(
 *   id = "list",
 *   label = @Translation("List of items"),
 *   definition_class = "\Drupal\Core\TypedData\ListDataDefinition"
 * )
 */
class ItemList extends TypedData ... {
  ...
}

Place it in a magic 🔮 folder

example: MY_MODULE/src/Plugin/DataType

1

2

Plugins always needs a manager

define()

The Law of Demeter?

class DefaultPluginManager extends PluginManagerBase 
implements PluginManagerInterface, ... {
  ...
}
  

interface PluginManagerInterface extends 
  DiscoveryInterface, 
  FactoryInterface,
  MapperInterface{
}

interface DiscoveryInterface {
  getDefinition($plugin_id, $exception_on_invalid = TRUE);
  getDefinitions();
  hasDefinition($plugin_id);
}

interface FactoryInterface {
  createInstance($plugin_id, array $configuration = []);
}

interface MapperInterface {
  getInstance(array $options);
}

define()

Interface