Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/lib/Drupal/Component/Plugin/ConfigurablePluginInterface.php

@@ -0,0 +1,41 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Component\Plugin\ConfigurablePluginInterface.
+ */
+
+namespace Drupal\Component\Plugin;
+
+/**
+ * Provides an interface for a configurable plugin.
+ *
+ * @ingroup plugin_api
+ */
+interface ConfigurablePluginInterface extends DependentPluginInterface {
+
+  /**
+   * Gets this plugin's configuration.
+   *
+   * @return array
+   *   An array of this plugin's configuration.
+   */
+  public function getConfiguration();
+
+  /**
+   * Sets the configuration for this plugin instance.
+   *
+   * @param array $configuration
+   *   An associative array containing the plugin's configuration.
+   */
+  public function setConfiguration(array $configuration);
+
+  /**
+   * Gets default configuration for this plugin.
+   *
+   * @return array
+   *   An associative array with the default configuration.
+   */
+  public function defaultConfiguration();
+
+}