public async Task <T> GetAsync(TKey id, CancellationToken cancellationToken)
{
if (Aggregates.ContainsKey(id))
{
var aggregate = Aggregates[id];
if (!aggregate.IsVersionSync)
{
return(aggregate);
}
return(await GetAsync(aggregate, cancellationToken));
}
var snapshoot = await SnapshootRepository.GetSnapshootAsync(id, cancellationToken);
if (snapshoot != null)
{
return(await GetAsync(snapshoot, cancellationToken));
}
var events = await EventStore.GetAggregateEvents(AggregateType, id, cancellationToken).ToListAsync(cancellationToken);
var instance = Activator.CreateInstance(typeof(T), new object[] { id, events }) as T;
Aggregates[id] = instance;
EventStore.TryAddEventContainer(instance);
return(instance);
}
public void Handle(UpdateItemCommand command)
{
var itemEvents = EventStore.GetAggregateEvents <ItemBaseEvent>(command.Id);
var item = new Item();
item.LoadFromHistory(itemEvents);
item.Update(command.Name, command.Quantity);
var events = item.GetUncommittedEvents();
EventStore.Persist(events);
foreach (var @event in events)
{
EventBus.Send(@event);
}
}
public void Handle(DeleteItemCommand command)
{
var itemEvents = EventStore.GetAggregateEvents <ItemBaseEvent>(command.Id);
var item = new Item();
item.LoadFromHistory(itemEvents);
item.Delete();
var uncommitedEvents = item.GetUncommittedEvents();
EventStore.Persist(uncommitedEvents);
foreach (var @event in uncommitedEvents)
{
EventBus.Send(@event);
}
}
public async Task <T> GetAsync(T snapshoot, CancellationToken cancellationToken)
{
if (!snapshoot.IsVersionSync)
{
throw new VersionNotAccurateException();
}
var snapshootVersion = snapshoot.Version;
var lastVersion = await EventStore.GetAggregateLastVersionAsync(AggregateType, snapshoot.Id, cancellationToken);
if (snapshootVersion < lastVersion)
{
var events = await EventStore.GetAggregateEvents(AggregateType, snapshoot.Id, snapshootVersion, cancellationToken).ToListAsync(cancellationToken);
snapshoot.UpdateFromStore(events);
}
Aggregates.TryAdd(snapshoot.Id, snapshoot);
EventStore.TryAddEventContainer(snapshoot);
return(snapshoot);
}