Drupal\graphql\Plugin\GraphQL\PluggableSchemaBuilder

Complexity

Total Complexity

28

Size/Duplication

Total Lines	182
Duplicated Lines	0 %

Coupling/Cohesion

Components	1
Dependencies	1

Importance

Changes

0

7 Methods

Rating	Name	Duplication	Size	Complexity
A	__construct()	0	3	1
A	getInstance()	0	19	4
C	find()	0	42	11
B	findByName()	0	28	6
A	getCacheIdentifier()	0	8	2
A	sortRecursive()	0	10	3
A	__sleep()	0	4	1

<?php

namespace Drupal\graphql\Plugin\GraphQL;

use Drupal\Component\Plugin\Exception\InvalidPluginDefinitionException;
use Drupal\Core\DependencyInjection\DependencySerializationTrait;

class PluggableSchemaBuilder implements PluggableSchemaBuilderInterface {
  use DependencySerializationTrait {
    __sleep as sleepDependencies;
  }

  /**
   * The type system plugin manager aggregator service.
   *
   * @var \Drupal\graphql\Plugin\GraphQL\TypeSystemPluginManagerAggregator
   */
  protected $pluginManagers;

  /**
   * Static cache of type system plugin instances.
   *
   * @var \Drupal\graphql\Plugin\GraphQL\TypeSystemPluginInterface
   */
  protected $instances = [];

  /**
   * PluggableSchemaBuilder constructor.
   *
   * @param \Drupal\graphql\Plugin\GraphQL\TypeSystemPluginManagerAggregator $pluginManagers
   *   Type system plugin manager aggregator service.
   */
  public function __construct(TypeSystemPluginManagerAggregator $pluginManagers) {
    $this->pluginManagers = $pluginManagers;
  }

  /**
   * {@inheritdoc}
   */
  public function getInstance($pluginType, $pluginId, array $pluginConfiguration = []) {
    $cid = $this->getCacheIdentifier($pluginType, $pluginId, $pluginConfiguration);
    if (!isset($this->instances[$cid])) {
      $manager = $this->pluginManagers->getPluginManager($pluginType);
      if (empty($manager)) {
        throw new \LogicException(sprintf('Could not find %s plugin manager for plugin %s.', $pluginType, $pluginId));
      }

      // We do not allow plugin configuration for now.
      $instance = $manager->createInstance($pluginId, $pluginConfiguration);
      if (empty($instance)) {
        throw new \LogicException(sprintf('Failed to instantiate plugin %s of type %s.', $pluginId, $pluginType));
      }

      $this->instances[$cid] = $instance;
    }

    return $this->instances[$cid];
  }

  /**
   * {@inheritdoc}
   */
  public function find(callable $selector, array $types) {
    $items = [];

    /** @var \Drupal\graphql\Plugin\GraphQL\TypeSystemPluginManagerInterface $manager */
    foreach ($this->pluginManagers as $type => $manager) {
      if (!in_array($type, $types)) {
        continue;
      }

      foreach ($manager->getDefinitions() as $id => $definition) {
        $name = $definition['name'];

        if (!array_key_exists($name, $items) || $items[$name]['weight'] < $definition['weight']) {
          if (($priority = $selector($definition)) !== NULL) {
            $items[$name] = [
              'weight' => $definition['weight'],
              'id' => $id,
              'type' => $type,
              'priority' => (int) $priority,
            ];
          }
        }
      }
    }

    // Sort the plugins so that the ones with higher weight come first.
    usort($items, function (array $a, array $b) {
      if ($a['priority'] === $b['priority']) {
        if ($a['weight'] === $b['weight']) {
          return 0;
        }

        return ($a['weight'] < $b['weight']) ? 1 : -1;
      }

      return ($a['priority'] < $b['priority']) ? 1 : -1;
    });

    return array_map(function (array $item) {
      return $this->getInstance($item['type'], $item['id']);
    }, $items);
  }

  /**
   * {@inheritdoc}
   */
  public function findByName($name, array $types) {
    $parts = explode(':', $name);
    $chain = array_reverse(array_reduce($parts, function ($carry, $current) {
      return $carry + [implode(':', array_filter([end($carry), $current]))];
    }, []), TRUE);

    $result = $this->find(function($definition) use ($name, $chain) {
      if (!empty($definition['type'])) {
        foreach ($chain as $priority => $part) {
          if ($definition['type'] === $part) {
            return $priority + 1;
          }
        }
      }

      if ($definition['name'] === $name) {
        return 0;
      }

      return NULL;
    }, $types);

    if (empty($result)) {
      return $this->getInstance('scalar', 'undefined');
    }

    return array_pop($result);
  }

  /**
   * Creates a plugin instance cache identifier.
   *
   * @param string $pluginType
   *   The plugin type.
   * @param string $pluginId
   *   The plugin id.
   * @param array $pluginConfiguration
   *   The plugin configuration.
   *
   * @return string
   */
  protected function getCacheIdentifier($pluginType, $pluginId, array $pluginConfiguration) {
    if (empty($pluginConfiguration)) {
      return "$pluginType:::$pluginId";
    }

    $configCid = md5(serialize($this->sortRecursive($pluginConfiguration)));
    return "$pluginType:::$pluginId:::$configCid";
  }

  /**
   * Recursively sorts an array.
   *
   * Useful for generating a cache identifiers.
   *
   * @param array $subject
   *   The array to sort.
   *
   * @return array
   *   The sorted array.
   */
  protected function sortRecursive(array $subject) {
    asort($subject);
    foreach ($subject as $key => $item) {
      if (is_array($item)) {
        $subject[$key] = $this->sortRecursive($item);
      }
    }

    return $subject;
  }

  /**
   * {@inheritdoc}
   */
  public function __sleep() {
    // Don't write the plugin instances into the cache.
    return array_diff($this->sleepDependencies(), ['instances']);
  }

}