private static Commit BuildCommit(CommitAttempt attempt)
{
return(new Commit(attempt.BucketId,
attempt.StreamId,
//attempt.ConcurrencyToken,
attempt.StreamRevision,
attempt.CommitStamp,
attempt.Headers,
attempt.Body,
attempt.Events,
isDispatched: false));
}
public async Task <ICommit> CommitAsync(CommitAttempt attempt, CancellationToken cancellation)
{
StreamHead streamHead;
if (attempt.StreamRevision == 1)
{
streamHead = await AddStreamHeadAsync(attempt.BucketId,
attempt.StreamId,
headRevision : 0,
snapshotRevision : 0,
dispatchedRevision : 0,
cancellation);
}
else
{
streamHead = await _database.GetOneAsync <StreamHead>(p => p.BucketId.Equals(attempt.BucketId) &&
p.StreamId.Equals(attempt.StreamId), cancellation);
}
if (streamHead.HeadRevision >= attempt.StreamRevision)
{
return(null);
}
var commit = BuildCommit(attempt);
try
{
if (!await _database.AddAsync(commit, cancellation))
{
return(null);
}
}
catch (OperationCanceledException) when(cancellation.IsCancellationRequested && attempt.StreamRevision == 1)
{
// TODO: Are we allowed to delete the stream head here? Another one may add the first commit to the stream concurrently.
//await TryWriteOperation(() => _streamHeads.DeleteOneAsync(head => head.BucketId.Equals(attempt.BucketId) && head.StreamId.Equals(attempt.StreamId)));
throw;
}
await UpdateStreamHeadRevisionAsync(streamHead, commit.StreamRevision, cancellation);
return(commit);
}
