104 lines
2.7 KiB
Common Lisp
104 lines
2.7 KiB
Common Lisp
;;;; cl-scopes/core/actor - basic actor definitions
|
|
|
|
(defpackage :scopes/core/actor
|
|
(:use :common-lisp)
|
|
(:local-nicknames (:async :scopes/util/async)
|
|
(:shape :scopes/shape)
|
|
(:util :scopes/util))
|
|
(:export #:start #:stop #:create #:send
|
|
#:message #:content #:customer #:set-content
|
|
#:*logger* #:*root*
|
|
#:echo #:inc #:lgi
|
|
#:calculator #:plus #:minus #:show))
|
|
|
|
(in-package :scopes/core/actor)
|
|
|
|
;;;; basic message implementation
|
|
|
|
(defgeneric content (msg)
|
|
(:method (msg) msg))
|
|
|
|
(defgeneric customer (msg)
|
|
(:method (msg) nil))
|
|
|
|
(defclass message ()
|
|
((content :reader content :initarg :content :initform nil)
|
|
(customer :reader customer :initarg :customer :initform nil)))
|
|
|
|
(defun message (content &optional customer)
|
|
(make-instance 'message :content content :customer customer))
|
|
|
|
(defgeneric set-content (msg fn)
|
|
(:method (msg fn) (funcall fn msg))
|
|
(:method ((msg message) fn)
|
|
(message (funcall fn (content msg)) (customer msg))))
|
|
|
|
;;;; actor loop (listener)
|
|
|
|
(eval-when (:compile-toplevel :load-toplevel :execute)
|
|
(when (not (boundp '+quit-message+))
|
|
(defconstant +quit-message+ (gensym "QUIT"))))
|
|
|
|
(defun start (mb bhv &key foreground (listener #'ac-loop))
|
|
(if foreground
|
|
(ac-loop mb bhv)
|
|
(async:submit-task mb listener mb bhv)))
|
|
|
|
(defun stop (mb)
|
|
(send mb +quit-message+))
|
|
|
|
(defun ac-loop (mb bhv)
|
|
(let ((msg (async:rcv mb)))
|
|
(unless (eq (content msg) +quit-message+)
|
|
(ac-loop mb (or (funcall bhv msg) bhv)))))
|
|
|
|
(defun ac-vloop (mb bhv)
|
|
(multiple-value-bind (msg ok) (async:try-rcv mb)
|
|
(if ok
|
|
(if (eq (content msg) +quit-message+)
|
|
nil
|
|
(ac-vloop mb (or (funcall bhv msg) bhv)))
|
|
bhv)))
|
|
|
|
;;;; the core (classical, i.e. Hewitt) actor API
|
|
;;; there is no `become` operation: the behavior just returns the new behavior
|
|
|
|
(defun create (bhv)
|
|
(let ((mb (async:make-mb)))
|
|
(start mb bhv)
|
|
(start mb bhv :listener #'ac-vloop)
|
|
mb))
|
|
|
|
(defun send (mb msg)
|
|
;(util:lgi msg)
|
|
(async:snd mb msg)
|
|
(multiple-value-bind (bhv done) (async:try-receive-result mb)
|
|
(util:lgi done)
|
|
(if (and done bhv)
|
|
(async:submit-task mb (lambda () (ac-vloop mb bhv))))))
|
|
|
|
;;;; predefined behaviors
|
|
|
|
(defun no-op (msg))
|
|
|
|
(defun lgi (msg)
|
|
(util:lgi (content msg)))
|
|
|
|
(defun echo (msg)
|
|
(send (customer msg) msg))
|
|
|
|
;;;; example behavior: calculator
|
|
|
|
(defun calculator (&optional (val 0))
|
|
(lambda (msg)
|
|
;(format t "calc ~a ~a~%" val (content msg))
|
|
(destructuring-bind (fn &optional param) (content msg)
|
|
(funcall fn msg val param))))
|
|
|
|
(defun plus (msg val param)
|
|
(calculator (+ val param)))
|
|
(defun minus (msg val param)
|
|
(calculator (- val param)))
|
|
(defun show (msg val param)
|
|
(send (customer msg ) (message val)))
|
|
|