/**
* Determines a winner from the list of buzzes accumulated.
*
* Note: This method is destructive, and will clear the list of buzzes on completion.
* @return BuzzerResolution
*/
public function resolve()
{
if ($this->isEmpty()) {
return BuzzerResolution::createFailure();
}
/** @var BuzzReceivedEvent $winner */
$winner = $this->buzzes->reduce(function (BuzzReceivedEvent $carry, BuzzReceivedEvent $event) {
if ($event->getDifference() < $carry->getDifference()) {
return $event;
}
return $carry;
}, $this->buzzes->first());
$resolution = BuzzerResolution::createSuccess($winner->getContestant(), $winner->getDifference());
$this->buzzes = new Collection();
return $resolution;
}
/**
* We have resolved who buzzed in first, notify the relevant entities.
*
* @param BuzzerResolution $resolution
*/
public function onBuzzerResolution(BuzzerResolution $resolution)
{
// Is anyone subscribed to buzzer events right now?
if (!array_key_exists(self::BUZZER_TOPIC, $this->subscribedTopics)) {
return;
}
$this->subscribedTopics[self::BUZZER_TOPIC]->broadcast($resolution->toJson());
}