public async Task HandleMessage(
StreamMessage message,
IProcessedStreamState state,
Func <StreamMessage, CancellationToken, Task> executeProjectMessage,
ConnectedProjectionIdentifier projection,
CancellationToken cancellationToken)
{
if (await IsCloseToStreamEnd(message, cancellationToken))
{
throw new StreamGapDetectedException(state.DetermineGapPositions(message), projection);
}
_logger.LogWarning(
"Expected messages at positions [{UnprocessedPositions}] were not processed for {Projection}.",
string.Join(", ", state.DetermineGapPositions(message)),
projection);
await executeProjectMessage(message, cancellationToken);
}
private static ProcessMessageAction DetermineProcessMessageAction(
StreamMessage message,
IProcessedStreamState lastProcessedPosition)
{
if (message.Position <= lastProcessedPosition.Position)
{
return(ProcessMessageAction.Skip);
}
if (message.Position == lastProcessedPosition.ExpectedNextPosition)
{
return(ProcessMessageAction.Process);
}
if (message.Position > lastProcessedPosition.ExpectedNextPosition)
{
return(ProcessMessageAction.HandleGap);
}
return(ProcessMessageAction.Unknown);
}