/**
* @param \Atrauzzi\PhpEventSourcing\AggregateRoot $aggregateRoot
* @throws \Atrauzzi\PhpEventSourcing\Exception\OptimisticConcurrency
*/
public function save(AggregateRoot $aggregateRoot)
{
foreach ($aggregateRoot->getUncommittedEvents() as $event) {
$this->eventStore->beginTransaction();
$sequenceKey = sprintf('%s%s', $aggregateRoot->getType(), $aggregateRoot->getId());
/** @var \Atrauzzi\PhpEventSourcing\GoogleCloudDatastore\EventSequence|null $sequence */
$sequence = $this->sequenceStore->fetchByName($sequenceKey);
if ($sequence) {
$currentSequence = $sequence->getValue();
$desiredSequence = $aggregateRoot->getLastSequence() + 1;
if ($currentSequence >= $desiredSequence) {
throw new OptimisticConcurrencyException($aggregateRoot, $event);
}
$sequence->setValue($desiredSequence);
} else {
$sequence = new EventSequence();
$sequence->setValue(0);
}
$this->sequenceStore->upsert($sequence);
$this->eventStore->upsert($this->createGdsEvent($aggregateRoot, $event));
}
}
