;;;; remote-mailbox-packet.scm
;;;; Kon Lovett, Sep '17

;; Issues;;
;; - struct vs vector

(module remote-mailbox-packet

(;export
  make-remote-mailbox-packet
  remote-mailbox-packet?
  remote-mailbox-packet-key
  remote-mailbox-packet-value )

(import scheme (chicken base) (chicken fixnum) (chicken type))

(define-type mailbox-packet-id fixnum)

(define-type mailbox-packet (vector mailbox-packet-id * *))

(: make-remote-mailbox-packet (symbol * -> mailbox-packet))
(: remote-mailbox-packet? (* -> boolean : mailbox-packet))
(: remote-mailbox-packet-key (mailbox-packet -> symbol))
(: remote-mailbox-packet-value (mailbox-packet -> *))

;;; Remote Mailbox Packet

(define-constant REMOTE-MAILBOX-TAG most-positive-fixnum)

(define (make-remote-mailbox-packet key val)
  (vector REMOTE-MAILBOX-TAG key val) )

(define (remote-mailbox-packet? obj)
  (and (vector? obj)
       (= 3 (vector-length obj))
       (eq? REMOTE-MAILBOX-TAG (vector-ref obj 0))) )

(define (remote-mailbox-packet-key rmp) (vector-ref rmp 1))
(define (remote-mailbox-packet-value rmp) (vector-ref rmp 2))

) ;module remote-mailbox-packet