Beispiel #1
0
        async Task <TResult> ReadQueryCheckpoint <TResult>(FlowKey key, Func <TResult> getDefault, Func <ResolvedEvent, TResult> getCheckpoint)
        {
            var             stream = key.GetCheckpointStream();
            EventReadResult result = default(EventReadResult);

            try
            {
                result = await _context.Connection.ReadEventAsync(stream, StreamPosition.End, resolveLinkTos : false);
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }

            switch (result.Status)
            {
            case EventReadStatus.NoStream:
            case EventReadStatus.NotFound:
                return(getDefault());

            case EventReadStatus.Success:
                return(getCheckpoint(result.Event.Value));

            default:
                throw new Exception($"Unexpected result when reading {stream}: {result.Status}");
            }
        }
        public async Task <FlowResumeInfo> ReadFlowResumeInfo(FlowKey key)
        {
            var stream = key.GetCheckpointStream();

            var result = await _context.Connection.ReadEventAsync(stream, StreamPosition.End, resolveLinkTos : false);

            switch (result.Status)
            {
            case EventReadStatus.NoStream:
                return(await new ReadFlowWithoutCheckpointCommand(_context, key).Execute());

            case EventReadStatus.Success:
                return(await new ReadFlowWithCheckpointCommand(_context, key, result.Event?.Event).Execute());

            default:
                throw new Exception($"Unexpected result when reading {stream} to resume: {result.Status}");
            }
        }
Beispiel #3
0
        internal async Task <FlowInfo> Execute()
        {
            var stream = _key.GetCheckpointStream();

            var result = await _context.Connection.ReadEventAsync(stream, StreamPosition.End, resolveLinkTos : false);

            switch (result.Status)
            {
            case EventReadStatus.NoStream:
            case EventReadStatus.NotFound:
                return(new FlowInfo.NotFound());

            case EventReadStatus.Success:
                _checkpoint = result.Event.Value;
                _metadata   = _context.ReadCheckpointMetadata(_checkpoint);

                return(ReadFlow());

            default:
                throw new Exception($"Unexpected result when reading {stream}: {result.Status}");
            }
        }