Consider implementing Unit of Work like pattern to isolate complex tasks and their execution

[Thoronir42]

I feel that it could be usefull to provide pattern like

class NotifyContestantsJob implements ExecutableJob {
  private $templateMails;

  public function validateParameters() {
    $parameters = func_get_args();
    // check if $parameters[0] is array of Person
    // check if $parameters[1] is a Contest
  }

  public function getJobProperties() {
    return [
      'transaction-atomic',
    ];
  }

  public function run(Person[] $contestants, Contests $contest) {
    foreach ($contestants as $contestant) {
        $this->templateMails->sendContestMail($contestants, $contest);
    }
  }
}

This could be used in two ways:

// either directly:
$notifyContestantJob->run($contestants, $contest);

// or with some other context
JobExecutor::schedule($notifyContestantJob, $contestants, $contest);

Also it might be nice to specify bulk/single logic?