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|
;;;;; -*-coding: iso-8859-1;-*-
;;;;;
;;;;; Copyright (C) 1991-2002 Lysator Academic Computer Association.
;;;;;
;;;;; This file is part of the LysKOM Emacs LISP client.
;;;;;
;;;;; LysKOM is free software; you can redistribute it and/or modify it
;;;;; under the terms of the GNU General Public License as published by
;;;;; the Free Software Foundation; either version 2, or (at your option)
;;;;; any later version.
;;;;;
;;;;; LysKOM is distributed in the hope that it will be useful, but WITHOUT
;;;;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
;;;;; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
;;;;; for more details.
;;;;;
;;;;; You should have received a copy of the GNU General Public License
;;;;; along with LysKOM; see the file COPYING. If not, write to
;;;;; Lysator, c/o ISY, Linkoping University, S-581 83 Linkoping, SWEDEN,
;;;;; or the Free Software Foundation, Inc., 675 Mass Ave, Cambridge,
;;;;; MA 02139, USA.
;;;;;
;;;;; Please mail bug reports to bug-lyskom@lysator.liu.se.
;;;;;
;;;; ================================================================
;;;; ================================================================
;;;;
;;;; File: prefetch.el
;;;;
;;;; The (new) prefetch system.
;;;;
(def-kom-var lyskom-prefetch-queue nil
"A queue where all prefetch requests are entered."
local)
(defvar lyskom-inhibit-prefetch nil
"When non-nil, disables the prefetch.")
(def-kom-var lyskom-pending-prefetch 0
"Variable counting the number of unfinished prefetch requests."
local)
(defun lyskom-setup-prefetch ()
"Set up the prefetch system"
(setq lyskom-prefetch-queue (lyskom-queue-create))
(setq lyskom-pending-prefetch 0)
(setq lyskom-inhibit-prefetch nil)
(setq lyskom-membership-is-read 0))
(defun lyskom-reset-prefetch ()
"Reset the prefetch system"
(lyskom-setup-prefetch))
(defsubst lyskom-membership-is-read ()
"Return t if the while membership list has been fetched, and nil otherwise."
(eq lyskom-membership-is-read 't))
(defun lyskom-fetch-start-of-map (conf-stat membership)
"Block fetching map for MEMBERSHIP until we see a text.
Start the prefetch for the remainder of the map."
(let* ((first-local (1+ (membership->last-text-read membership)))
(map (blocking-do 'local-to-global
(membership->conf-no membership)
first-local
lyskom-fetch-map-nos)))
(when map
(lyskom-enter-map-in-to-do-list map conf-stat membership)
(when (text-mapping->later-texts-exist map)
(lyskom-prefetch-map-using-conf-stat conf-stat
(text-mapping->range-end map)
membership)))))
(defun lyskom-prefetch-conf (conf-no)
"Prefetch the conf-stat for the conference with number CONF-NO."
(lyskom-queue-enter lyskom-prefetch-queue
`(initiate-get-conf-stat prefetch
lyskom-prefetch-handler
,conf-no))
(lyskom-continue-prefetch))
(defun lyskom-prefetch-pers (pers-no)
"Prefetch the pers-stat for person with number PERS-NO."
(lyskom-queue-enter lyskom-prefetch-queue
`(initiate-get-pers-stat prefetch
lyskom-prefetch-handler
,pers-no))
(lyskom-continue-prefetch))
(defun lyskom-prefetch-text (text-no)
"Prefetch the text-stat for the text with number TEXT-NO."
(lyskom-queue-enter lyskom-prefetch-queue
`(initiate-get-text-stat prefetch
lyskom-prefetch-handler
,text-no))
(lyskom-continue-prefetch))
(defun lyskom-prefetch-textmass (text-no)
"Prefetch the text mass for the text with number TEXT-NO."
(lyskom-queue-enter lyskom-prefetch-queue
`(initiate-get-text prefetch
lyskom-prefetch-handler
,text-no))
(lyskom-continue-prefetch))
(defun lyskom-prefetch-textauth (text-no)
"Prefetch the text stat and the author of text number TEXT-NO."
(lyskom-queue-enter lyskom-prefetch-queue
`(initiate-get-text-stat prefetch
lyskom-prefetch-textauth-handler
,text-no))
(lyskom-continue-prefetch))
(defun lyskom-prefetch-text-all (text-no)
"Prefetch all info about the text with number TEXT-NO."
(lyskom-queue-enter lyskom-prefetch-queue
`(initiate-get-text-stat prefetch
lyskom-prefetch-text-all-handler
,text-no))
(lyskom-continue-prefetch))
(defun lyskom-prefetch-text-stat-all (text-stat)
"Prefetch all info about the text with text stat TEXT-STAT."
(lyskom-prefetch-text-all-handler text-stat))
(defun lyskom-prefetch-texttree (text-no &optional only-new)
"Prefetch all info about the text with number TEXT-NO and descends recursively.
If ONLY-NEW is non-nil and the text-stat in question is already
prefetched the prefetch is not done."
(unless (and only-new (cache-get-text-stat text-no))
(lyskom-queue-enter lyskom-prefetch-queue
`(initiate-get-text-stat prefetch
lyskom-prefetch-texttree-handler
,text-no)))
(lyskom-continue-prefetch))
(defun lyskom-prefetch-membership (pers-no)
"Prefetch memberships for PERS-NO."
(lyskom-queue-enter lyskom-prefetch-queue
(list (lambda (pers-no)
(if (numberp lyskom-membership-is-read)
(initiate-get-part-of-membership
'prefetch 'lyskom-prefetch-membership-handler
pers-no lyskom-membership-is-read
lyskom-fetch-membership-length
pers-no)
(lyskom-prefetch-handler)))
pers-no))
(lyskom-continue-prefetch))
(defun lyskom-prefetch-one-membership (conf-no pers-no)
"Prefetch the membership in CONF-NO for PERS-NO."
(lyskom-queue-enter lyskom-prefetch-queue
`(initiate-query-read-texts prefetch
lyskom-prefetch-read-texts-handler
,pers-no
,conf-no
t
,lyskom-max-int
,conf-no))
(lyskom-continue-prefetch))
(defun lyskom-prefetch-map (conf-no membership)
"Prefetches a map for conf CONF-NO."
(lyskom-prefetch-map-from conf-no
(1+ (membership->last-text-read membership))
membership))
(defun lyskom-prefetch-map-from (conf-no first-local membership)
"Prefetches a map for conf CONFNO starting att FIRST-LOCAL."
(lyskom-queue-enter lyskom-prefetch-queue
`(initiate-get-conf-stat prefetch
lyskom-prefetch-confstatformap-handler
,conf-no
,first-local
,membership))
(lyskom-continue-prefetch))
(defun lyskom-prefetch-map-using-conf-stat (conf-stat first-local membership)
"Prefetches a map for conf CONFSTAT starting att FIRST-LOCAL."
(lyskom-queue-enter lyskom-prefetch-queue
`(initiate-local-to-global prefetch
lyskom-prefetch-map-handler
,(conf-stat->conf-no conf-stat)
,first-local
,lyskom-fetch-map-nos
,conf-stat
,first-local
,membership))
(lyskom-continue-prefetch))
(defun lyskom-prefetch-texts (texts)
"Prefetches a list of texts."
(when texts
(lyskom-queue-enter lyskom-prefetch-queue
`(initiate-get-text-stat prefetch
lyskom-prefetch-texts-handler
,(car texts)
,(cdr texts))))
(lyskom-continue-prefetch))
(defun lyskom-prefetch-cancel-prefetch-map (conf-no &optional queue))
;;; ================================================================
;;; Internal prefetch functions
(defun lyskom-stop-prefetch ()
"Stop the prefetch process temporarily."
)
(defun lyskom-start-prefetch ()
"Start the whole prefetch process"
(lyskom-continue-prefetch))
(defun lyskom-continue-prefetch ()
"Called after each prefetch is finished and also when the whole prefetch
process is started. Used to keep prefetch going."
(unless lyskom-inhibit-prefetch
(let ((lyskom-inhibit-prefetch t))
(while (and (< lyskom-pending-prefetch lyskom-prefetch-limit)
(lyskom-prefetch-one-item)
(++ lyskom-pending-prefetch))))))
(defun lyskom-prefetch-one-item ()
"Get the first element of the prefetch data structure and fetch it.
Return t if an element was prefetched, otherwise return nil."
(let ((item (lyskom-queue-delete-first lyskom-prefetch-queue)))
(cond ((null item) nil)
((functionp (car item)) (apply (car item) (cdr item)) t)
(t (signal 'lyskom-internal-error
(list "unknown prefetch key" (car item)))))))
;;; ================================================================
;;; Handlers
;;;
(defun lyskom-prefetch-textauth-handler (text-stat)
"Prefetch the conf-stat of the author of the text TEXT-STAT."
(-- lyskom-pending-prefetch)
(lyskom-stop-prefetch)
(when text-stat
(lyskom-prefetch-conf (text-stat->author text-stat)))
(lyskom-start-prefetch))
(defun lyskom-prefetch-text-all-handler (text-stat)
"Prefetch all info neccessary to write the text with text-stat TEXT-STAT."
(-- lyskom-pending-prefetch)
(lyskom-stop-prefetch)
(lyskom-prefetch-conf (text-stat->author text-stat))
(lyskom-prefetch-textmass (text-stat->text-no text-stat))
(lyskom-traverse misc (text-stat->misc-info-list text-stat)
(let ((type (misc-info->type misc)))
(cond
((memq type lyskom-recpt-types-list)
(lyskom-prefetch-conf (misc-info->recipient-no misc)))
((eq type 'COMM-IN)
(lyskom-prefetch-textauth (misc-info->comm-in misc)))
((eq type 'FOOTN-IN)
(lyskom-prefetch-textauth (misc-info->footn-in misc)))
((eq type 'COMM-TO)
(lyskom-prefetch-textauth (misc-info->comm-to misc)))
((eq type 'FOOTN-TO)
(lyskom-prefetch-textauth (misc-info->footn-to misc)))
(t nil))))
(lyskom-start-prefetch))
(defun lyskom-prefetch-texttree-handler (text-stat)
"Prefetch all info neccessary to write the text with text-stat TEXT-STAT.
Then prefetch all info (texttree) of comments."
(-- lyskom-pending-prefetch)
(when text-stat
(lyskom-stop-prefetch)
(lyskom-prefetch-conf (text-stat->author text-stat))
(lyskom-prefetch-textmass (text-stat->text-no text-stat))
(lyskom-traverse misc (text-stat->misc-info-list text-stat)
(let ((type (misc-info->type misc)))
(cond
((memq type lyskom-recpt-types-list)
(lyskom-prefetch-conf (misc-info->recipient-no misc)))
((eq type 'COMM-IN)
(lyskom-prefetch-texttree (misc-info->comm-in misc) t))
((eq type 'FOOTN-IN)
(lyskom-prefetch-texttree (misc-info->footn-in misc) t))
((eq type 'COMM-TO)
(lyskom-prefetch-textauth (misc-info->comm-to misc)))
((eq type 'FOOTN-TO)
(lyskom-prefetch-textauth (misc-info->footn-to misc)))
(t nil)))))
(lyskom-start-prefetch))
(defun lyskom-prefetch-read-texts-handler (membership pers-no)
(-- lyskom-pending-prefetch)
(lyskom-stop-prefetch)
(when membership
(let ((old-mship (lyskom-try-get-membership
(membership->conf-no membership) t)))
(if old-mship
(set-membership->read-texts old-mship
(membership->read-texts membership))
(lyskom-add-memberships-to-membership (list membership)))
(when (and (lyskom-visible-membership membership)
(lyskom-prefetch-map (membership->conf-no membership)
membership))))
(lyskom-start-prefetch)))
(defun lyskom-prefetch-membership-handler (memberships pers-no)
"Handle the return of the membership prefetch call."
(-- lyskom-pending-prefetch)
(lyskom-stop-prefetch)
(lyskom-add-memberships-to-membership memberships)
(if (and (numberp lyskom-membership-is-read)
(< (length memberships) lyskom-fetch-membership-length))
(setq lyskom-membership-is-read t)
(setq lyskom-membership-is-read (+ lyskom-membership-is-read
lyskom-fetch-membership-length))
(lyskom-prefetch-membership pers-no))
(lyskom-start-prefetch))
(defun lyskom-prefetch-confstatformap-handler (conf-stat first-local membership)
"Now that we have the conf-stat we can fetch the map."
(-- lyskom-pending-prefetch)
(lyskom-stop-prefetch)
(lyskom-prefetch-map-using-conf-stat conf-stat first-local membership)
(lyskom-start-prefetch))
(defun lyskom-prefetch-map-handler (map conf-stat first-local membership)
"Handle the return of the membership prefetch call.
Maps are `cached' in lyskom-to-do-list."
(-- lyskom-pending-prefetch)
(lyskom-stop-prefetch)
(let ((next-start (and map (text-mapping->range-end map))))
(when map
(when (text-mapping->later-texts-exist map)
(lyskom-prefetch-map-using-conf-stat conf-stat
next-start
membership))
(lyskom-enter-map-in-to-do-list map conf-stat membership)))
(lyskom-start-prefetch)
(lyskom-update-prompt)
(lyskom-set-mode-line))
(defun lyskom-prefetch-texts-handler (text-stat texts queue)
"Prefetch all info neccessary to write the text with text-stat TEXT-STAT."
(-- lyskom-pending-prefetch)
(lyskom-stop-prefetch)
(lyskom-prefetch-conf (text-stat->author text-stat))
(lyskom-prefetch-textmass (text-stat->text-no text-stat))
(lyskom-traverse misc (text-stat->misc-info-list text-stat)
(let ((type (misc-info->type misc)))
(cond ((memq type lyskom-recpt-types-list)
(lyskom-prefetch-conf (misc-info->recipient-no misc)))
((eq type 'COMM-IN)
(lyskom-prefetch-textauth (misc-info->comm-in misc)))
((eq type 'FOOTN-IN)
(lyskom-prefetch-textauth (misc-info->footn-in misc)))
((eq type 'COMM-TO)
(lyskom-prefetch-textauth (misc-info->comm-to misc)))
((eq type 'FOOTN-TO)
(lyskom-prefetch-textauth (misc-info->footn-to misc)))
(t nil))))
(lyskom-prefetch-texts texts)
(lyskom-start-prefetch))
(defun lyskom-prefetch-handler (&rest data)
"Handler called after each simple prefetch request is done."
(-- lyskom-pending-prefetch)
(lyskom-continue-prefetch))
|
