/**
* Should a snapshot be created?
*
* @param AggregateRoot $root
* @return bool
*/
public function shouldCreateSnapshot(AggregateRoot $root)
{
if ($root->hasChanges()) {
$lastSnapshot = $this->store->get($root->getIdentity());
$threshold = new \DateTime(date('c', strtotime('-' . $this->threshold)));
if ($lastSnapshot->getCreationDate() > $threshold) {
return true;
}
}
return false;
}
/**
* Save the aggregate state as single snapshot instead of multiple history events
*
* @param \Domain\Aggregates\AggregateRoot $aggregate
* @return type
* @throws \Exception when no snapshotStore was attached
*/
public function saveSnapshot(AggregateRoot $aggregate)
{
if (is_null($this->snapshotStore)) {
throw new \Exception('Unable to create snapshot; No store attached');
}
if ($aggregate->hasChanges()) {
$aggregate = $aggregate::reconstituteFrom(new CommittedEvents($aggregate->getIdentity(), $aggregate->getChanges()->getEvents()));
}
return $this->snapshotStore->save($aggregate);
}