Hi I watched the Cadence talks and read through the golang code a while back and love what you're doing with cadence. Really glad to see you're moving from Thrift/TChannel to protobuf/grpc - that was a blocker before.

If anyone could help me understand the following I'd appreciate it...

I understand that the event history is cached at worker nodes and the whole history of events is only delivered to workers if needed (ie if out of cache) and that normally cadence manages to deliver events for the same workflow to the same worker.

My question relates to what exactly happens within a single worker process.

On each new event, does the worker process loop through all events in the history - starting from the beginning - in order to get back its internal state, and then process the new event, and then shutdown ready to repeat this for the next event.

Or... does cadence keep the internal state around by keeping the goroutine alive waiting on a channel midway through it's workflow logic and waiting for the next event to continue execution.

Thanks