api-8.x-1.x-dev/modules/api_search_api_solr_defaults/api_search_api_solr_defaults.install

<?php

/**
 * @file
 * Install and uninstall functions for the API Solr Search-API Defaults module.
 */

/**
 * Implements hook_requirements().
 */
function api_search_api_solr_defaults_requirements($phase) {
  $requirements = [];

  if ($phase == 'install') {
    if (\Drupal::moduleHandler()->moduleExists('search_api_solr')) {
      $entities_to_check = [
        'search_api_index' => 'default_api_solr_index',
        'search_api_server' => 'default_solr_server',
        'view' => 'api_search_api_solr',
      ];

      /** @var \Drupal\Core\Entity\EntityTypeManager $entity_type_manager */
      $entity_type_manager = \Drupal::service('entity_type.manager');
      foreach ($entities_to_check as $entity_type => $entity_id) {
        // Find out if the entity is already in place. If so, fail to install
        // the module.
        $entity_storage = $entity_type_manager->getStorage($entity_type);
        $entity_storage->resetCache();
        $entity = $entity_storage->load($entity_id);

        if ($entity) {
          $requirements['api_search_api_solr_defaults:defaults_exist'] = [
            'severity' => REQUIREMENT_ERROR,
            'description' => t('It looks like the default setup provided by this module already exists on your site. Cannot re-install module.'),
          ];
          break;
        }
      }
    }
  }

  return $requirements;
}

/**
 * Implements hook_install().
 */
function api_search_api_solr_defaults_install() {
  // Clear the display plugin cache after installation so the plugin for the new
  // view (display) gets found.
  \Drupal::service('plugin.manager.search_api.display')
    ->clearCachedDefinitions();
}