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Positively assert detected failures during continuous interest

pr/32
Tony Garnock-Jones 4 years ago
parent
commit
275b60310f
  1. 24
      racket/syndicate/examples/actor/rpc-with-error.rkt

24
racket/syndicate/examples/actor/rpc-with-error.rkt

@ -4,6 +4,7 @@
(require/activate syndicate/drivers/timestate)
(assertion-struct function (argument result))
(assertion-struct failed (argument))
(spawn #:name 'division-server
(during/spawn (observe (function `(divide ,$n ,$d) _))
@ -15,12 +16,30 @@
(react (assert (function `(divide ,n ,d) (/ n d)))
(on-start (printf "S: Computed ~a/~a\n" n d))))))
(spawn #:name 'failure-signaller
(during/spawn (observe (function $req _))
(on-start (printf "F: Noticed request ~a\n" req))
(on-stop (printf "F: Forgetting request ~a\n" req))
(on (retracted (advertise (function req _)))
(printf "F: Noticed failure for ~a\n" req)
(react (assert (failed req))
(on-start (printf "F: Asserted failure for ~a\n" req))
(on-stop (printf "F: Retracting failure for ~a\n" req))))))
(define (invert d #:on-answer [ks void] #:on-error [kf void])
(define req `(divide 1 ,d))
(printf "C: Requesting ~a\n" req)
(on (asserted (advertise (function req _)))
(printf "C: Answer in progress!\n"))
(stop-when (asserted (failed req))
;; Indirectly detect error: relies on failure-signaller.
;; We could comment out the next stop-when clause and rely
;; entirely on this one -- both here and in the cache.
;; Anywhere there's a client.
(printf "C: Received failure-detection signal!\n")
(kf))
(stop-when (retracted (advertise (function req _)))
;; Directly detect error
(printf "C: No answer was supplied!\n")
(kf))
(stop-when (asserted (function req $answer))
@ -42,7 +61,10 @@
(react (invert 0
#:on-error
(lambda ()
(printf "C: Done!\n"))))))))))
(react (invert 0
#:on-error
(lambda ()
(printf "C: Done!\n")))))))))))))
(spawn (on (asserted (observe (function $req _)))
(printf "X: Noticed request ~a\n" req)

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