trait LoggerChannelTrait in Drupal 8

trait LoggerChannelTrait {

  /**
   * The logger channel factory service.
   *
   * @var \Drupal\Core\Logger\LoggerChannelFactoryInterface
   */
  protected $loggerFactory;

  /**
   * Gets the logger for a specific channel.
   *
   * @param string $channel
   *   The name of the channel. Can be any string, but the general practice is
   *   to use the name of the subsystem calling this.
   *
   * @return \Psr\Log\LoggerInterface
   *   The logger for the given channel.
   *
   * @todo Require the use of injected services:
   *   https://www.drupal.org/node/2733703
   */
  protected function getLogger($channel) {
    if (!$this->loggerFactory) {
      $this->loggerFactory = \Drupal::service('logger.factory');
    }
    return $this->loggerFactory
      ->get($channel);
  }

  /**
   * Injects the logger channel factory.
   *
   * @param \Drupal\Core\Logger\LoggerChannelFactoryInterface $logger_factory
   *   The logger channel factory service.
   *
   * @return $this
   */
  public function setLoggerFactory(LoggerChannelFactoryInterface $logger_factory) {
    $this->loggerFactory = $logger_factory;
    return $this;
  }

}