1 ;;; fuel-connection.el -- asynchronous comms with the fuel listener
3 ;; Copyright (C) 2008 Jose Antonio Ortega Ruiz
4 ;; See http://factorcode.org/license.txt for BSD license.
6 ;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
7 ;; Keywords: languages, fuel, factor
8 ;; Start date: Thu Dec 11, 2008 03:10
12 ;; Handling communications via a comint buffer running a factor
18 ;;; Default connection:
20 (make-variable-buffer-local
21 (defvar fuel-con--connection nil))
23 (defun fuel-con--get-connection (buffer/proc)
24 (if (processp buffer/proc)
25 (fuel-con--get-connection (process-buffer buffer/proc))
26 (with-current-buffer buffer/proc
27 (or fuel-con--connection
28 (setq fuel-con--connection
29 (fuel-con--setup-connection buffer/proc))))))
32 ;;; Request and connection datatypes:
34 (defun fuel-con--connection-queue-request (c r)
35 (let ((reqs (assoc :requests c)))
36 (setcdr reqs (append (cdr reqs) (list r)))))
38 (defun fuel-con--make-request (str cont &optional sender-buffer)
39 (list :fuel-connection-request
42 (cons :continuation cont)
43 (cons :buffer (or sender-buffer (current-buffer)))))
45 (defsubst fuel-con--request-p (req)
46 (and (listp req) (eq (car req) :fuel-connection-request)))
48 (defsubst fuel-con--request-id (req)
49 (cdr (assoc :id req)))
51 (defsubst fuel-con--request-string (req)
52 (cdr (assoc :string req)))
54 (defsubst fuel-con--request-continuation (req)
55 (cdr (assoc :continuation req)))
57 (defsubst fuel-con--request-buffer (req)
58 (cdr (assoc :buffer req)))
60 (defsubst fuel-con--request-deactivate (req)
61 (setcdr (assoc :continuation req) nil))
63 (defsubst fuel-con--request-deactivated-p (req)
64 (null (cdr (assoc :continuation req))))
66 (defsubst fuel-con--make-connection (buffer)
67 (list :fuel-connection
70 (cons :completed (make-hash-table :weakness 'value))
71 (cons :buffer buffer)))
73 (defsubst fuel-con--connection-p (c)
74 (and (listp c) (eq (car c) :fuel-connection)))
76 (defsubst fuel-con--connection-requests (c)
77 (cdr (assoc :requests c)))
79 (defsubst fuel-con--connection-current-request (c)
80 (cdr (assoc :current c)))
82 (defun fuel-con--connection-clean-current-request (c)
83 (let* ((cell (assoc :current c))
86 (puthash (fuel-con--request-id req) req (cdr (assoc :completed c)))
89 (defsubst fuel-con--connection-completed-p (c id)
90 (gethash id (cdr (assoc :completed c))))
92 (defsubst fuel-con--connection-buffer (c)
93 (cdr (assoc :buffer c)))
95 (defun fuel-con--connection-pop-request (c)
96 (let ((reqs (assoc :requests c))
97 (current (assoc :current c)))
98 (setcdr current (prog1 (cadr reqs) (setcdr reqs (cddr reqs))))
99 (if (and current (fuel-con--request-deactivated-p current))
100 (fuel-con--connection-pop-request c)
104 ;;; Connection setup:
106 (defun fuel-con--setup-connection (buffer)
108 (let ((conn (fuel-con--make-connection buffer)))
109 (fuel-con--setup-comint)
110 (setq fuel-con--connection conn)))
112 (defun fuel-con--setup-comint ()
113 (add-hook 'comint-redirect-filter-functions
114 'fuel-con--comint-redirect-filter t t))
117 ;;; Requests handling:
119 (defun fuel-con--process-next (con)
120 (when (not (fuel-con--connection-current-request con))
121 (let* ((buffer (fuel-con--connection-buffer con))
122 (req (fuel-con--connection-pop-request con))
123 (str (and req (fuel-con--request-string req))))
124 (when (and buffer req str)
126 (comint-redirect-send-command str
127 (get-buffer-create "*factor messages*")
131 (defun fuel-con--comint-redirect-filter (str)
132 (if (not fuel-con--connection)
133 (format "\nERROR: No connection in buffer (%s)\n" str)
134 (let ((req (fuel-con--connection-current-request fuel-con--connection)))
135 (if (not req) (format "\nERROR: No current request (%s)\n" str)
136 (let ((cont (fuel-con--request-continuation req))
137 (id (fuel-con--request-id req))
138 (rstr (fuel-con--request-string req))
139 (buffer (fuel-con--request-buffer req)))
142 (format "\nWARNING: Droping result for request %s:%S (%s)\n"
145 (with-current-buffer (or buffer (current-buffer))
147 (format "\nINFO: %s:%S processed\nINFO: %s\n" id rstr str))
148 (error (format "\nERROR: continuation failed %s:%S \nERROR: %s\n"
150 (fuel-con--connection-clean-current-request fuel-con--connection)))))))
153 ;;; Message sending interface:
155 (defun fuel-con--send-string (buffer/proc str cont &optional sender-buffer)
157 (let ((con (fuel-con--get-connection buffer/proc)))
159 (error "FUEL: couldn't find connection"))
160 (let ((req (fuel-con--make-request str cont sender-buffer)))
161 (fuel-con--connection-queue-request con req)
162 (fuel-con--process-next con)
165 (defvar fuel-connection-timeout 30000
166 "Time limit, in msecs, blocking on synchronous evaluation requests")
168 (defun fuel-con--send-string/wait (buffer/proc str cont &optional timeout sbuf)
170 (let* ((con (fuel-con--get-connection buffer/proc))
171 (req (fuel-con--send-string buffer/proc str cont sbuf))
172 (id (and req (fuel-con--request-id req)))
173 (time (or timeout fuel-connection-timeout))
176 (while (and (> time 0)
177 (not (fuel-con--connection-completed-p con id)))
179 (setq time (- time step)))
181 (fuel-con--request-deactivate req)
185 (provide 'fuel-connection)
186 ;;; fuel-connection.el ends here