public function shouldCreateSnapshot(AggregateRoot $root)
{
if ($root->hasChanges()) {
$lastEvent = $root->getChanges()[count($root->getChanges()) - 1];
$lastVersion = $lastEvent->getVersion();
for ($i = $root->getVersion(); $i <= $lastVersion; $i++) {
if ($i % $this->interval == 0) {
return true;
}
}
}
return false;
}
/**
* To store the updates made to an Aggregate, we only need to
* commit the latest recorded events to the EventStore.
*
* An eventbus can handle eventual or direct consistency.
*
* Snapsnots could be made if the policy allows it and this repo is
* constructed with a storage for storing snapshots.
*
* @param AggregateRoot $aggregate
* @return CommittedEvents
*/
public function save(AggregateRoot $aggregate)
{
$uncommitted = $aggregate->getChanges();
$committedStream = $this->eventStore->commit($uncommitted);
// consider eventual consistency
if (!is_null($this->eventBus)) {
$this->eventBus->publish($committedStream);
}
// do we need to create a snapshot at this point?
if (!is_null($this->snapshotStore) && $this->snapshottingPolicy->shouldCreateSnapshot($aggregate)) {
$this->saveSnapshot($aggregate);
}
// remove changes on aggregate from memory
$aggregate->clearChanges();
return $committedStream;
}
