Historical interest only: A Dataspace-like language and system that led to "Network Calculus" (ESOP 2014) and minimart-2014, in turn a predecessor to Syndicate. https://syndicate-lang.org/papers#gjthf-esop14
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#lang marketplace
(observe-publishers (tcp-channel ? (tcp-listener 5999) ?)
(match-conversation (tcp-channel from to _)
(on-presence (spawn (echoer from to)))))
(define (echoer from to)
(transition stateless
(publisher (tcp-channel to from ?))
(subscriber (tcp-channel from to ?)
(on-absence (quit))
(on-message
[(tcp-channel _ _ data)
(send-message (tcp-channel to from data))]))))