os2-tcp-test-bytewise-echo.rkt from 4 July 2012
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#lang racket/base
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;; A more different trivial example program demonstrating os2-tcp.rkt.
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(require racket/string)
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(require racket/set)
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(require racket/match)
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(require "os2.rkt")
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(require "os2-timer.rkt")
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(require "os2-tcp.rkt")
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(define ((connection-handler local-addr remote-addr) self-pid)
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(define (reader-role)
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(role 'echoer (topic-subscriber (tcp-channel remote-addr local-addr (wild)))
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#:state state
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[(tcp-channel remote _ (? bytes? bs))
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(transition state
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(send-tcp-credit remote-addr local-addr 16)
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(send-message (tcp-channel local-addr remote-addr bs)))]
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[(tcp-channel remote _ (? eof-object?))
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(transition state
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(kill))]))
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(transition 'no-state
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(send-tcp-credit remote-addr local-addr 16)
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(reader-role)))
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(define (listener local-addr)
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(transition 'no-state
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(role 'inbound-handler (topic-subscriber (tcp-channel (wild) local-addr (wild)) #:monitor? #t)
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#:state state
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#:topic t
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#:on-presence (match t
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[(topic 'publisher (tcp-channel remote-addr (== local-addr) _) #f)
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(transition state (spawn (connection-handler local-addr remote-addr)))]))))
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(define (main port)
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(define (arm-timer)
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(role 'waiter (topic-subscriber (timer-expired (wild) (wild)))
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#:state state
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#:on-presence (transition state (send-message (set-timer 'label 500 'relative)))
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[(timer-expired _ _)
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(transition state (delete-role 'waiter) (arm-timer))]))
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(ground-vm
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(transition 'none
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(spawn tcp-spy)
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(spawn tcp-driver)
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(spawn timer-driver)
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(arm-timer)
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(spawn (listener (tcp-listener port))))))
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(main 5999)
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