public virtual void Commit(Commit attempt)
{
Logger.Debug(Messages.AttemptingToCommit, attempt.Events.Count, attempt.StreamId, attempt.CommitSequence);
TryMongo(() =>
{
BsonDocument commit = attempt.ToMongoCommit(_serializer);
try
{
// for concurrency / duplicate commit detection safe mode is required
PersistedCommits.Insert(commit, WriteConcern.Acknowledged);
UpdateStreamHeadAsync(attempt.BucketId, attempt.StreamId, attempt.StreamRevision, attempt.Events.Count);
Logger.Debug(Messages.CommitPersisted, attempt.CommitId);
}
catch (MongoException e)
{
if (!e.Message.Contains(ConcurrencyException))
{
throw;
}
Commit savedCommit = PersistedCommits.FindOne(attempt.ToMongoCommitIdQuery()).ToCommit(_serializer);
if (savedCommit.CommitId == attempt.CommitId)
{
throw new DuplicateCommitException();
}
Logger.Debug(Messages.ConcurrentWriteDetected);
throw new ConcurrencyException();
}
});
}
private ICommit PersistWithClientSideOptimisticLoop(CommitAttempt attempt)
{
return(TryMongo(() =>
{
BsonDocument commitDoc = attempt.ToMongoCommit(
_getNextCheckpointNumber(),
_serializer
);
bool retry = true;
while (retry)
{
try
{
// for concurrency / duplicate commit detection safe mode is required
PersistedCommits.Insert(commitDoc, _insertCommitWriteConcern);
retry = false;
UpdateStreamHeadAsync(attempt.BucketId, attempt.StreamId, attempt.StreamRevision, attempt.Events.Count);
Logger.Debug(Messages.CommitPersisted, attempt.CommitId);
}
catch (MongoException e)
{
if (!e.Message.Contains(ConcurrencyException))
{
throw;
}
// checkpoint index?
if (e.Message.Contains(MongoCommitIndexes.CheckpointNumberMMApV1) ||
e.Message.Contains(MongoCommitIndexes.CheckpointNumberWiredTiger))
{
commitDoc[MongoCommitFields.CheckpointNumber] = _getNextCheckpointNumber().LongValue;
}
else
{
ICommit savedCommit = PersistedCommits.FindOne(attempt.ToMongoCommitIdQuery()).ToCommit(_serializer);
if (savedCommit.CommitId == attempt.CommitId)
{
throw new DuplicateCommitException();
}
Logger.Debug(Messages.ConcurrentWriteDetected);
throw new ConcurrencyException();
}
}
}
return commitDoc.ToCommit(_serializer);
}));
}
