/// <summary>
/// Initializes an event source's routing and recording behavior.
/// </summary>
protected AggregateRootEntity()
{
_recorder = new EventRecorder();
_router = new EventRouter();
_expectedVersion = ExpectedVersion.NoStream;
}
internal void RegisterChild(ChildEntity childAggregate, out Action <object> raise, out EventRouter router)
{
Ensure.NotNull(childAggregate, nameof(childAggregate));
raise = Raise;
router = Router;
}