/**
* Apply the provided event. Applying events means they are added to the uncommitted event queue
* and forwarded to the {@link #handle(org.axonframework.domain.DomainEventMessage)} event handler
* method} for processing.
*
* <p>The event is applied on all entities part of this aggregate.
*
* @param eventPayload The payload of the event to apply
* @param metaData any meta-data that must be registered with the Event
*/
protected void apply(Object eventPayload, MetaData metaData) {
if (getIdentifier() == null) {
// workaround for aggregates that set the aggregate identifier in an Event Handler
if (getUncommittedEventCount() > 0 || getVersion() != null) {
throw new IncompatibleAggregateException(
"The Aggregate Identifier has not been initialized. "
+ "It must be initialized at the latest when the "
+ "first event is applied.");
}
handleRecursively(new GenericDomainEventMessage<Object>(null, 0, eventPayload, metaData));
registerEvent(metaData, eventPayload);
} else {
DomainEventMessage event = registerEvent(metaData, eventPayload);
handleRecursively(event);
}
}
/**
* {@inheritDoc}
*
* <p>This implementation is aware of a special type of <code>DomainEvents</code>: the <code>
* AggregateSnapshot</code>, which is a snapshot event, containing the actual aggregate inside.
*
* <p><code>AggregateSnapshot</code> events are used to initialize the aggregate with the correct
* version ({@link #getVersion()}).
*
* @throws IllegalStateException if this aggregate was already initialized.
*/
@Override
public void initializeState(DomainEventStream domainEventStream) {
Assert.state(getUncommittedEventCount() == 0, "Aggregate is already initialized");
long lastSequenceNumber = -1;
while (domainEventStream.hasNext()) {
DomainEventMessage event = domainEventStream.next();
lastSequenceNumber = event.getSequenceNumber();
handleRecursively(event);
}
initializeEventStream(lastSequenceNumber);
}
