public async Task Execute <TIdent>(IEventStoreAsync eventStorage, TIdent id, Action <TAggregateRoot> execute) where TIdent : IIdentity
{
if (eventStorage == null)
{
throw new ArgumentNullException("eventStorage");
}
if (id == null || id.Equals(default(TIdent)))
{
throw new ArgumentException("id is null or default value", "id");
}
// Load event stream from the store
var stream = await eventStorage.LoadEventStream(id);
// create new Customer aggregate from the history
var aggregate = new TAggregateRoot();
aggregate.LoadsFromHistory(stream.Events);
// execute delegated action
Logger.DebugFormat("Executing Update on aggregate {0}", aggregate);
execute(aggregate);
// append resulting changes to the stream, expect the same version loaded before applying ddd logic
if (aggregate.Changes.Any())
{
Logger.DebugFormat("Saving {0} uncommited events on aggregate {1}", aggregate.Changes.Count, aggregate);
await eventStorage.AppendToStream(id, stream.Version, aggregate.Changes);
}
Logger.DebugFormat("Finished Update on {0}", aggregate);
}
public async Task Execute <TIdent, TResult, TIdentCreated>(IEventStoreAsync eventStorage, TIdent id, Func <TResult, TAggregateRoot> execute, TIdentCreated createId)
where TIdent : IIdentity
where TResult : IAggregate, new()
where TIdentCreated : IIdentity
{
if (eventStorage == null)
{
throw new ArgumentNullException("eventStorage");
}
if (id == null || id.Equals(default(TIdent)))
{
throw new ArgumentException("id is null or default value", "id");
}
if (createId == null || createId.Equals(default(TIdentCreated)))
{
throw new ArgumentException("createid is null or default value", "createId");
}
EventStream stream = await eventStorage.LoadEventStream(id);
// create new Customer aggregate from the history
var aggregate = new TResult();
aggregate.LoadsFromHistory(stream.Events);
// execute delegated action
Logger.DebugFormat("Executing UpdateAndCreateAggregate on aggregate {0}", aggregate);
TAggregateRoot res = execute(aggregate);
if (aggregate.Changes.Any())
{
throw new Exception("You cannot modify more than one aggregate per command!");
}
if (res != null && res.Changes.Any())
{
Logger.DebugFormat("Saving {0} uncommited events on result aggregate {1}", res.Changes.Count, res);
await eventStorage.AppendToStream(createId, 0, res.Changes);
Logger.DebugFormat("Finished Create on {0}", aggregate);
return;
}
throw new InvalidOperationException("No aggregate created on execute");
}
