public async Task SaveEventsAsync <TAggregateRoot>(TAggregateRoot aggregateRoot) where TAggregateRoot : AggregateRoot
{
var events = aggregateRoot.UncommittedEvent;
var version = aggregateRoot.Version;
const string INSERT_SQL = "INSERT INTO events_storage (Id,AggregateId,Event,EventType,Version) VALUES (@id,@aggregateId,@event,@eventType,@version)";
using (var connection = connectionFactory.Create(ConnectionType.EventSourcing))
{
connection.Open();
using (var transaction = connection.BeginTransaction())
{
try
{
foreach (var @event in events)
{
version++;
@event.Version = version;
//每1024个事件创建一个快照
if (version % 1024 == 0)
{
var memento = aggregateRoot.GetMemento();
memento.Version = version;
await mementoStorage.SaveMementoAsync(memento);
}
var json = JsonConvert.SerializeObject(@event);
var type = @event.GetType();
await connection.ExecuteAsync(INSERT_SQL, new
{
Id = Guid.NewGuid().ToString(),
aggregateId = aggregateRoot.Id.ToString(),
Event = json,
EventType = type.FullName,
Version = version
}, transaction);
}
transaction.Commit();
}
catch (Exception ex)
{
logger.LogError(ex, ex.Message);
transaction.Rollback();
}
}
connection.Close();
}
}
public async Task SaveEventsAsync <TAggregateRoot>(TAggregateRoot aggregateRoot) where TAggregateRoot : AggregateRoot
{
var queue = events.GetOrAdd(aggregateRoot.Id, id => new ConcurrentQueue <Event>());
var version = aggregateRoot.Version;
foreach (var @event in aggregateRoot.UncommittedEvent)
{
version++;
@event.Version = version;
if (version % 1024 == 0)
{
var memento = aggregateRoot.GetMemento();
memento.Version = version;
await mementoStorage.SaveMementoAsync(memento);
}
queue.Enqueue(@event);
}
}
