We will stream events both directions over the connection joining the two halves of the Parse plugin. We recognize this as an application of the Half Object Plus Protocol pattern.
Open ⇒ ( Started | Stopped | Finished )
Start ⇒ Started → Accepted* → Finished
Stop ⇒ Stopped
Discard ⇒
There will be at most one Start per item id. The server will maintain the status of that start.
Closing a connection does not stop a run.
Opening a closed connection (or a second connection) resumes the flow of events for the id.
Stopping a run saves cpu resources but does not release storage.
Discarding a run releases storage, possibly after reference counting.