54 lines
1.3 KiB
Common Lisp
54 lines
1.3 KiB
Common Lisp
;;;; cl-scopes/core/actor - basic actor definitions
|
|
|
|
(defpackage :scopes/core/actor
|
|
(:use :common-lisp)
|
|
(:local-nicknames (:util :scopes/util))
|
|
(:export #:actor #:become #:create #:send
|
|
#:echo #:inc #:lgi))
|
|
|
|
(in-package :scopes/core/actor)
|
|
|
|
;;;; basic message and actor implementations
|
|
|
|
(defclass message ()
|
|
((content :reader content :initarg :content :initform nil)
|
|
(customer :reader customer :initarg :customer :initform nil)))
|
|
|
|
(defun message (content customer)
|
|
(make-instance 'message :content content :customer customer))
|
|
|
|
(defclass actor ()
|
|
((behavior :accessor behavior :initarg :behavior :initform #'no-op)))
|
|
|
|
(defgeneric deliver (ac msg)
|
|
(:method ((ac actor) msg)
|
|
(funcall (behavior ac) ac msg)))
|
|
|
|
;;;; the core (Hewitt) actor API
|
|
|
|
(defun become (ac bhv)
|
|
(setf (behavior ac) bhv))
|
|
|
|
(defun create (bhv &optional (cls 'actor))
|
|
(make-instance cls :behavior bhv))
|
|
|
|
(defun send (addr content &key customer)
|
|
(let ((ac addr) (msg (message content customer)))
|
|
(deliver ac msg)))
|
|
|
|
;;;; predefined behaviors
|
|
|
|
(defun no-op (ac msg))
|
|
|
|
(defun lgi (ac msg)
|
|
(util:lgi (content msg)))
|
|
|
|
(defun echo (ac msg)
|
|
(send (customer msg) msg))
|
|
|
|
(defun inc (&optional (val 0))
|
|
#'(lambda (ac msg)
|
|
(let ((c (content msg)))
|
|
(if (eq c :show)
|
|
(send (create #'lgi) val)
|
|
(become ac (inc (+ c val)))))))
|