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

core/lib/Drupal/Core/Executable/ExecutableException.php

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+<?php
+/**
+ * @file
+ * Contains \Drupal\Core\Executable\ExecutableException.
+ */
+
+namespace Drupal\Core\Executable;
+
+use Drupal\Component\Plugin\Exception\ExceptionInterface;
+
+/**
+ * Generic executable plugin exception class.
+ */
+class ExecutableException extends \Exception implements ExceptionInterface {}

core/lib/Drupal/Core/Executable/ExecutableInterface.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Core\Executable\ExecutableInterface.
+ */
+
+namespace Drupal\Core\Executable;
+
+/**
+ * An interface for executable plugins.
+ *
+ * @ingroup plugin_api
+ */
+interface ExecutableInterface {
+
+  /**
+   * Executes the plugin.
+   */
+  public function execute();
+
+}

core/lib/Drupal/Core/Executable/ExecutableManagerInterface.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Core\Executable\ExecutableManagerInterface.
+ */
+
+namespace Drupal\Core\Executable;
+
+use Drupal\Component\Plugin\PluginManagerInterface;
+
+/**
+ * An interface for managers of executable plugins.
+ */
+interface ExecutableManagerInterface extends PluginManagerInterface {
+
+  /**
+   * Executes an executable plugin.
+   *
+   * @param \Drupal\Core\Executable\ExecutableInterface $plugin
+   *   An executable plugin instance managed by the implementing manager.
+   *
+   * @throws \Drupal\Core\Executable\ExecutableException
+   *   If the plugin could not be executed.
+   *
+   * @return mixed
+   *   The returned data varies by plugin implementation, e.g. conditions return
+   *   the boolean evaluation result.
+   */
+  public function execute(ExecutableInterface $plugin);
+
+}

core/lib/Drupal/Core/Executable/ExecutablePluginBase.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Core\Executable\ExecutablePluginBase.
+ */
+
+namespace Drupal\Core\Executable;
+
+use Drupal\Core\Plugin\ContextAwarePluginBase;
+use Symfony\Component\Validator\Validation;
+use Drupal\Component\Plugin\Exception\PluginException;
+
+/**
+ * Provides the basic architecture for executable plugins.
+ */
+abstract class ExecutablePluginBase extends ContextAwarePluginBase implements ExecutableInterface {
+
+  /**
+   * Gets an array of definitions of available configuration options.
+   *
+   * @todo: This needs to go into an interface.
+   *
+   * @return array
+   *   An array of typed data definitions describing available configuration
+   *   options, keyed by option name.
+   */
+  public function getConfigDefinitions() {
+    $definition = $this->getPluginDefinition();
+    if (!empty($definition['configuration'])) {
+      return $definition['configuration'];
+    }
+    return array();
+  }
+
+  /**
+   * Gets the definition of a configuration option.
+   *
+   * @todo: This needs to go into an interface.
+   *
+   * @return array
+   *   The typed data definition describing the configuration option, or FALSE
+   *   if the option does not exist.
+   */
+  public function getConfigDefinition($key) {
+    $definition = $this->getPluginDefinition();
+    if (!empty($definition['configuration'][$key])) {
+      return $definition['configuration'][$key];
+    }
+    return FALSE;
+  }
+
+  /**
+   * Gets all configuration values.
+   *
+   * @todo: This needs to go into an interface.
+   *
+   * @return array
+   *   The array of all configuration values, keyed by configuration option
+   *   name.
+   */
+  public function getConfig() {
+    return $this->configuration;
+  }
+
+  /**
+   * Sets the value of a particular configuration option.
+   *
+   * @param string $name
+   *   The name of the configuration option to set.
+   * @param mixed $value
+   *   The value to set.
+   *
+   * @todo This doesn't belong here. Move this into a new base class in
+   *   https://www.drupal.org/node/1764380.
+   * @todo This does not set a value in \Drupal::config(), so the name is confusing.
+   *
+   * @return \Drupal\Core\Executable\ExecutablePluginBase.
+   *   The executable object for chaining.
+   */
+  public function setConfig($key, $value) {
+    if ($definition = $this->getConfigDefinition($key)) {
+      $typed_data = \Drupal::typedDataManager()->create($definition, $value);
+
+      if ($typed_data->validate()->count() > 0) {
+        throw new PluginException("The provided configuration value does not pass validation.");
+      }
+    }
+    $this->configuration[$key] = $value;
+    return $this;
+  }
+}
+