apply method
Apply event
to current state.
If successful the event is added to
changes and current version is
incremented by 1.
Implementation
AggregateStateResult<TEvent, TValue, TId, TState> apply(TEvent event) {
final previous = _current;
_current = previous.when<TEvent, TState>(event);
if (_current == previous) {
return AggregateStateNoOp(
_current,
);
}
_changes.add(event);
return AggregateStateResult.ok(
current: _current,
previous: previous,
);
}