public void handle(TIdentity?id, ICommand <TState> command, Action <IEnumerable <EventInfo <TIdentity, TState> > > success,
Action <Exception> failure)
{
if (null == id)
{
try {
var evts = _aggregate.Exec(_aggregate.Zero, command);
var newId = _generator.Generate();
var newEvents = evts.Zip(Enumerable.Range(0, evts.Count),
(ev, v) => EventInfo <TIdentity, TState> .NewBuilder(ev, newId, v).Build());
success.Invoke(newEvents);
}
catch (Exception e) {
failure.Invoke(e);
}
}
else
{
try {
_eventStore.load(id.Value, (evts => {
var state = evts.OrderBy(x => x.Version)
.Select(x => x.Event)
.Aggregate(_aggregate.Zero, (r, e) => _aggregate.Apply(r, e));
var lastVer = evts.Last().Version;
var results = _aggregate.Exec(state, command);
var infos = results.Zip(Enumerable.Range(lastVer + 1, lastVer + results.Count),
(e, v) => EventInfo <TIdentity, TState> .NewBuilder(e, id.Value, v).Build());
success.Invoke(infos);
}), failure);
}
catch (Exception e) {
failure.Invoke(e);
}
}
}