EntityDefinitionUpdateManager::getChangeList

protected EntityDefinitionUpdateManager::getChangeList()

protected function getChangeList() {
  $this->entityManager->useCaches(FALSE);
  $change_list = array();

  foreach ($this->entityManager->getDefinitions() as $entity_type_id => $entity_type) {
    $original = $this->entityManager->getLastInstalledDefinition($entity_type_id);

    // @todo Support non-storage-schema-changing definition updates too:
    //   https://www.drupal.org/node/2336895.
    if (!$original) {
      $change_list[$entity_type_id]['entity_type'] = static::DEFINITION_CREATED;
    }
    else {
      if ($this->requiresEntityStorageSchemaChanges($entity_type, $original)) {
        $change_list[$entity_type_id]['entity_type'] = static::DEFINITION_UPDATED;
      }

      if ($this->entityManager->getStorage($entity_type_id) instanceof DynamicallyFieldableEntityStorageInterface) {
        $field_changes = array();
        $storage_definitions = $this->entityManager->getFieldStorageDefinitions($entity_type_id);
        $original_storage_definitions = $this->entityManager->getLastInstalledFieldStorageDefinitions($entity_type_id);

        // Detect created field storage definitions.
        foreach (array_diff_key($storage_definitions, $original_storage_definitions) as $field_name => $storage_definition) {
          $field_changes[$field_name] = static::DEFINITION_CREATED;
        }

        // Detect deleted field storage definitions.
        foreach (array_diff_key($original_storage_definitions, $storage_definitions) as $field_name => $original_storage_definition) {
          $field_changes[$field_name] = static::DEFINITION_DELETED;
        }

        // Detect updated field storage definitions.
        foreach (array_intersect_key($storage_definitions, $original_storage_definitions) as $field_name => $storage_definition) {
          // @todo Support non-storage-schema-changing definition updates too:
          //   https://www.drupal.org/node/2336895. So long as we're checking
          //   based on schema change requirements rather than definition
          //   equality, skip the check if the entity type itself needs to be
          //   updated, since that can affect the schema of all fields, so we
          //   want to process that update first without reporting false
          //   positives here.
          if (!isset($change_list[$entity_type_id]['entity_type']) && $this->requiresFieldStorageSchemaChanges($storage_definition, $original_storage_definitions[$field_name])) {
            $field_changes[$field_name] = static::DEFINITION_UPDATED;
          }
        }

        if ($field_changes) {
          $change_list[$entity_type_id]['field_storage_definitions'] = $field_changes;
        }
      }
    }
  }

  // @todo Support deleting entity definitions when we support base field
  //   purging. See https://www.drupal.org/node/2282119.

  $this->entityManager->useCaches(TRUE);

  return array_filter($change_list);
}