public async Task ProcessEventsAsync(PartitionContext context, IEnumerable <EventData> messages)
{
TaskMarker.OnStarted();
try
{
EventData lastMessage = null;
EventData lastCheckpointMessage = null;
var skipLastCheckpoint = false;
foreach (var message in messages)
{
if (!TaskMarker.CanRun)
{
break;
}
lastMessage = message;
if (OnSubmit(message, context))
{
lastCheckpointMessage = await CheckpointSafe(message, context);
if (!ReferenceEquals(lastCheckpointMessage, message))
{
// something went wrong (not all messages were processed with success)
// ToDo: add retry support
//skipLastCheckpoint = !ReferenceEquals(lastCheckpointMessage, message);
//skipLastCheckpoint = false;
}
}
}
if (!skipLastCheckpoint)
{
// checkpoint the last messages
if ((!ReferenceEquals(lastCheckpointMessage, lastMessage) && lastMessage != null))
{
await CheckpointSafe(lastMessage, context);
}
}
}
finally
{
TaskMarker.OnFinished();
}
}
