106 lines
2.7 KiB
Common Lisp
106 lines
2.7 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 (:async :scopes/util/async)
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(:shape :scopes/shape)
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(:util :scopes/util))
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(:export #:start #:stop #:create #:send
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#:message #:content #:customer #:set-content
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#:*logger* #:*root*
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#:echo #:inc #:lgi
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#:calculator #:plus #:minus #:show #:send-value))
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(in-package :scopes/core/actor)
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(eval-when (:compile-toplevel :load-toplevel :execute)
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(async:init))
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;;;; basic message implementation
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(defgeneric content (msg)
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(:method (msg) msg))
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(defgeneric customer (msg)
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(:method (msg) nil))
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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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(defgeneric set-content (msg fn)
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(:method (msg fn) (funcall fn msg))
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(:method ((msg message) fn)
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(message (funcall fn (content msg)) (customer msg))))
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;;;; actor loop (listener)
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(eval-when (:compile-toplevel :load-toplevel :execute)
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(when (not (boundp '+quit-message+))
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(defconstant +quit-message+ (gensym "QUIT"))))
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(defun start (mb bhv &key foreground)
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(if foreground
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(ac-loop mb bhv)
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(let ((ch (async:make-ch)))
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(async:submit-task ch (lambda () (ac-loop mb bhv)))
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ch)))
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(defun stop (mb)
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(send mb +quit-message+))
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(defun ac-loop (mb bhv)
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(let ((msg (async:rcv mb)))
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(unless (eq (content msg) +quit-message+)
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(ac-loop mb (or (funcall bhv msg) bhv)))))
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;;;; the core (classical, i.e. Hewitt) actor API
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;;; there is no `become` operation: the behavior just returns the new behavior
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(defun create (bhv)
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(let ((mb (async:make-mb)))
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(values mb (start mb bhv))))
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(defun send (mb msg)
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;(util:lgi msg)
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(async:snd mb msg))
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;;;; predefined behaviors
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(defun no-op (msg))
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(defun lgi (msg)
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(util:lgi (content msg)))
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(defun echo (msg)
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(send (customer msg) msg))
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;;;; predefined global actors
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(defvar *logger* (create #'lgi))
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(defun root-bhv (ac msg)
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(send *logger* msg))
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(defvar *root* (create #'root-bhv))
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;;;; example behavior: calculator
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(defun calculator (&optional (val 0))
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(lambda (msg)
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;(format t "calc ~a ~a~%" val (content msg))
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(destructuring-bind (fn &optional param) (content msg)
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(funcall fn msg val param))))
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(defun plus (msg val param)
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(calculator (+ val param)))
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(defun minus (msg val param)
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(calculator (- val param)))
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(defun show (msg val param)
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(send (or (customer msg) *logger*) (message val)))
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(defun send-value (msg val param)
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(send (customer msg) (message val)))
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