Drupal 8: Dependency injection in Service, Controller, Plugin, Deriver.

Controller.php

<?php
/**
 * Controller. Implements ContainerInjectionInterface
 */
namespace Drupal\gurei\Controller;

use Drupal\Core\Controller\ControllerBase;
use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
use Drupal\gurei\Service\CompanyService;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Class CompanyController.
 */
class CompanyController extends ControllerBase implements ContainerInjectionInterface {

  /**
   * CompanyController constructor.
   */
  public function __construct(private CompanyService $companyManager) {}

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static(
      $container->get('gurei.company_manager')
    );
  }
}

dependency_injection.md

Service

gurei.services.yml

services:
  gurei.company_manager:
    class: Drupal\gurei\Service\CompanyService
    arguments:
      - '@entity_type.manager'

CompanyService.php

<?php

namespace Drupal\gurei\Service;

use Drupal\Core\Entity\EntityTypeManagerInterface;

/**
 * Class CompanyService.
 */
class CompanyService {

  /**
   * Entity type manager.
   *
   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
   */
  protected $entityTypeManager;

  /**
   * CompanyService constructor.
   */
  public function __construct(EntityTypeManagerInterface $entity_type_manager) {
    $this->entityTypeManager = $entity_type_manager;
  }

}

Deriver.php

<?php
namespace Drupal\gurei\Plugin\Deriver;

use Drupal\Component\Plugin\Derivative\DeriverBase;
use Drupal\Core\Plugin\Discovery\ContainerDeriverInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

class SearchIndexStatusPageDeriver extends DeriverBase implements ContainerDeriverInterface {

  /**
   * @inheritDoc
   */
  public static function create(
    ContainerInterface $container,
    $base_plugin_id
  ) {
    // TODO: Implement create() method.
  }

}

EntityAccessControlHandler.php

<?php

class SponsorChildAccessControlHandler extends EntityAccessControlHandler implements EntityHandlerInterface {

  /**
   * SponsorChildAccessControlHandler constructor.
   */
  public function __construct(
    EntityTypeInterface $entity_type,
    private EntityTypeManagerInterface $entityTypeManager
  ) {
    parent::__construct($entity_type);
  }

  /**
   * {@inheritDoc}
   */
  public static function createInstance(
    ContainerInterface $container,
    EntityTypeInterface $entity_type
  ) {
    return new static(
      $entity_type,
      $container->get('entity_type.manager')
    );
  }
}

Form.php

<?php
class PriceListItemImportForm extends FormBase {

  public function __construct(private EntityFieldManagerInterface $entityFieldManager, private EntityTypeManagerInterface $entityTypeManager) {
  }

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static(
      $container->get('entity_field.manager'),
      $container->get('entity_type.manager')
    );
  }
}

Plugin.php

<?php
/**
 * Plugin. Implements ContainerFactoryPluginInterface
 */
namespace Drupal\drupal\Plugin\Block;

use Drupal\Core\Block\BlockBase;
use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Drupal\gurei\Service\CompanyService;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Defines a fallback plugin for missing block plugins.
 *
 * @Block(
 *   id = "company_block",
 *   admin_label = @Translation("Company block"),
 *   category = @Translation("Block"),
 * )
 */
class CompanyBlock extends BlockBase implements ContainerFactoryPluginInterface {

  /**
   * CompanyBlock constructor.
   */
  public function __construct(array $configuration, $plugin_id, $plugin_definition, private CompanyService $companyManager) {
    parent::__construct($configuration, $plugin_id, $plugin_definition);
  }

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
    return new static(
      $configuration,
      $plugin_id,
      $plugin_definition,
      $container->get('gurei.company_manager')
    );
  }

  /**
   * {@inheritdoc}
   */
  public function build() {
    return [
      '#markup' => $this->t('Company block'),
    ];
  }
}