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