public async Task <long> SaveAsync(AggregateBase aggregate, params KeyValuePair <string, string>[] extraHeaders)
{
var streamName = $"{aggregate.Identifier}-{aggregate.Id}";
var pendingEvents = aggregate.GetPendingEvents();
var originalVersion = (uint)aggregate.Version - (uint)pendingEvents.Count;
//TODO: hamárvanilyenstream-akkorszálljonel-kezelés, StreamState enum ?
try
{
IWriteResult result;
var commitHeaders = CreateCommitHeaders(aggregate, extraHeaders);
var eventsToSave = pendingEvents.Select(x => ToEventData(Guid.NewGuid(), x, commitHeaders));
result = await _eventStoreConnection.AppendToStreamAsync(streamName, originalVersion, eventsToSave);
aggregate.ClearPendingEvents();
return(result.NextExpectedVersion);
}
catch (WrongExpectedVersionException ex)
{
throw new /*Concurrency*/ Exception("concurrency exception", ex);
}
}
private static IDictionary <string, string> CreateCommitHeaders(AggregateBase aggregate, KeyValuePair <string, string>[] extraHeaders)
{
var commitId = Guid.NewGuid();
var commitHeaders = new Dictionary <string, string>
{
{ MetadataKeys.CommitIdHeader, commitId.ToString() },
{ MetadataKeys.AggregateClrTypeHeader, aggregate.GetType().AssemblyQualifiedName },
{ MetadataKeys.UserIdentityHeader, Thread.CurrentThread.Name }, // TODO - was Thread.CurrentPrincipal?.Identity?.Name
{ MetadataKeys.ServerNameHeader, "DefaultServerNameHEader" }, // TODO - was Environment.MachineName
{ MetadataKeys.ServerClockHeader, DateTime.UtcNow.ToString("o") }
};
foreach (var extraHeader in extraHeaders)
{
commitHeaders[extraHeader.Key] = extraHeader.Value;
}
return(commitHeaders);
}