void AppendToStream(IIdentity id, string envelopeId, Applied then, string explanation)
{
var stream = _factory.GetOrCreateStream(IdentityConvert.ToStream(id));
var b = new EnvelopeBuilder("unknown");
b.AddString("caused-by", envelopeId);
if (!String.IsNullOrEmpty(explanation))
{
b.AddString("explain", explanation);
}
foreach (var e in then.Events)
{
b.AddItem((object)e);
}
var data = _streamer.SaveEnvelopeData(b.Build());
Context.Debug("?? Append {0} at v{3} to '{1}' in thread {2}", then.Events.Count,
IdentityConvert.ToStream(id),
Thread.CurrentThread.ManagedThreadId,
then.Version);
if (!stream.TryAppend(data, TapeAppendCondition.VersionIs(then.Version)))
{
throw new InvalidOperationException("Failed to update the stream - it has been changed concurrently");
}
}
void Dispatch(string id, IEnumerable <ICommand> commands)
{
var stream = _factory.GetOrCreateStream(id);
var records = stream.ReadRecords(0, int.MaxValue).ToList();
var events = records
.Select(tr => _streamer.ReadAsEnvelopeData(tr.Data))
.SelectMany(i => i.Items)
.Select(i => (IEvent)i.Content)
.ToList();
var then = AggregateFactory
.LoadProject(events, commands)
.Select(e => new MessageBuilder(e.GetType(), e)).ToList();
if (then.Count == 0)
{
return;
}
// events are stored here as envelopes )
var b = new EnvelopeBuilder("unknown");
foreach (var e in then)
{
b.Items.Add(e);
}
var version = records.Count == 0 ? 0 : records.Last().Version;
var data = _streamer.SaveEnvelopeData(b.Build());
var result = stream.TryAppend(data, TapeAppendCondition.VersionIs(version));
if (!result)
{
throw new InvalidOperationException(
"Data was modified concurrently, and we don't have merging implemented, yet");
}
var args = _path.Split(':');
IQueueWriterFactory factory;
if (!_queue.TryGet(args[0], out factory))
{
throw new InvalidOperationException("Not found " + _path);
}
var arVersion = events.Count + 1;
var arName = id;
for (int i = 0; i < then.Count; i++)
{
var name = string.Format("{0}/{1}/{2}", arName, arVersion, i);
var builder = new EnvelopeBuilder(name);
builder.Items.Add(then[i]);
builder.AddString("from-entity", arName);
factory.GetWriteQueue(args[1]).PutMessage(builder.Build());
}
}
