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Commit 90ea4765 authored by Rinus Plasmeijer's avatar Rinus Plasmeijer
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threadhandler refactored

parent 378f4659
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libraries/iTasks/InternaliTasksThreadHandling.dcl
View file @ 90ea4765
......@@ -30,6 +30,8 @@ import InternaliTasksCommon
instance == ThreadKind
startAjaxApplication :: !Int !GlobalInfo !(Task a) !*TSt -> ((!Bool,!Int,TaskNr,!String,![TaskNr]),!*TSt) // determines which threads to execute and calls them..
// Setting of global information for a particular user
setPUserNr :: !Int !(Int -> Int) !*HSt -> (!GlobalInfo,!*HSt)
......@@ -41,7 +43,6 @@ showThreadNr :: !TaskNr -> String
showThreadTable :: !*TSt -> (!HtmlCode,!*TSt) // watch it: the actual threadnumber stored is one level deaper, so [-1:nr] instead of nr !!
// Thread creation
administrateNewThread :: !UserId !*TSt -> *TSt
mkTaskThread :: !SubPage !(Task a) -> Task a | iData a
......@@ -56,14 +57,7 @@ evalTaskThread :: !TaskThread -> Task a // execute the thr
insertNewThread :: !TaskThread !*TSt -> *TSt // insert new thread in table
deleteSubTasksAndThreads :: !TaskNr !*TSt -> *TSt
// Thread storages
ThreadTableStorage :: !(ThreadTable -> ThreadTable) -> (Task !ThreadTable) // used to store Tasknr of callbackfunctions / threads
// Copying thread tables from server to client and vica versa
copyThreadTableToClient :: !*TSt -> !*TSt // copies all threads for this user from server to client thread table
copyThreadTableFromClient :: !GlobalInfo !*TSt -> !*TSt // copies all threads for this user from client to server thread table
libraries/iTasks/InternaliTasksThreadHandling.icl
View file @ 90ea4765
......@@ -88,6 +88,108 @@ where
defaultGlobalInfo = { versionNr = 0, newThread = False, deletedThreads = []}
// ******************************************************************************************************
// Event handling for Ajax calls and Sapl handling on the client
// ******************************************************************************************************
// The following functions are defined to support "Ajax technologie" and Client site evaluation of i-Tasks.
// To make this possible, a part of the iTask task tree must be assigened to be a thread such that it can be evaluated as a stand-alone i-Task.
// The programmer has to decide which iTask should become a thread.
// For each event (iData triplet), the system will search for the thread to handle it.
// If a thread task is finished, the parent thread task is activated, and so on.
// Any action requiering the calculation of the Task Tree from scratch will be done one the server
// Watch it: the Client cannot create new Server threads
startAjaxApplication :: !Int !GlobalInfo !(Task a) !*TSt -> ((!Bool,!Int,TaskNr,!String,![TaskNr]),!*TSt) // determines which threads to execute and calls them..
startAjaxApplication thisUser versioninfo maintask tst=:{tasknr,options,html,trace,userId}
# tst = copyThreadTableFromClient versioninfo tst // synchronize thread tables of client and server, if applicable
// first determine whether we should start calculating the task tree from scratch starting at the root
# (mbevent,tst) = getTripletTaskNrs tst // see if there are any events, i.e. triplets received
| isNothing mbevent // no events
= startFromRoot versioninfo tasknr [tasknr] "No events, page refreshed" maintask tst
# event = fromJust mbevent // event found
# (table,tst) = ThreadTableStorage id tst // read thread table
| isEmpty table // events, but no threads, evaluate main application from scratch
= startFromRoot versioninfo event [tasknr] "No threads, page refreshed" maintask tst
# (mbthread,tst) = findParentThread event tst // look for thread to evaluate
| isEmpty mbthread // no thread can be found, happens e.g. when one switches from tasks
= startFromRoot versioninfo event [tasknr] "No matching thread, page refreshed" maintask tst
# thread = hd mbthread // thread found
| isMember thread.thrTaskNr versioninfo.deletedThreads // thread has been deleted is some past, version conflict
# tst = copyThreadTableToClient tst // copy thread table to client
= ((True,defaultUser,event,"Task does not exist anymore, please refresh",[tasknr]), tst)
| versioninfo.newThread // newthread added by someone
= startFromRoot versioninfo event [tasknr] "New tasks added, page refreshed" maintask tst
| not (isEmpty versioninfo.deletedThreads) // some thread has been deleted
= startFromRoot versioninfo event [tasknr] "Tasks deleted, page refreshed" maintask tst
| thread.thrUserId <> thisUser // updating becomes too complicated
= startFromRoot versioninfo event [tasknr] ("Thread of user " <+++ thread.thrUserId <+++ ", page refreshed") maintask tst
// ok, we have found a matching thread
# (_,tst=:{activated}) = evalTaskThread thread {tst & html = BT []} // evaluate the thread
| not activated // thread / task not yet finished
# tst = copyThreadTableToClient tst // copy thread table to client
= ((False,thisUser,event,"",[thread.thrTaskNr]),tst) // no further evaluation, aks user for more input
# (mbthread,tst) = findParentThread (tl thread.thrTaskNr) tst // look for thread to evaluate
= doParent mbthread maintask event [thread.thrTaskNr] {tst & html = BT [], options = options} // more to evaluate, call thread one level higher
where
doParent [] maintask event accu tst // no more parents of current event, do main task
= startFromRoot versioninfo event [tasknr:accu] "No more threads, page refreshed" maintask {tst & html = BT []}
doParent [parent:next] maintask event accu tst // do parent of current thread
| parent.thrUserId <> thisUser // updating becomes too complicated
= startFromRoot versioninfo event [tasknr:accu] ("Parent thread of user " <+++ parent.thrUserId <+++ ", page refreshed") maintask {tst & html = BT []}
# (_,tst=:{activated}) = evalTaskThread parent {tst & html = BT []} // start parent
| not activated // parent thread not yet finished
# tst = copyThreadTableToClient tst // copy thread table to client
= ((False,thisUser,event, "",[parent.thrTaskNr:accu]),tst) // no further evaluation, aks user for more input
# (mbthread,tst) = findParentThread (tl parent.thrTaskNr) tst // look for thread to evaluate
= doParent mbthread maintask event [parent.thrTaskNr:accu] {tst & options = options}// continue with grand parent ...
getTripletTaskNrs :: !*TSt -> *(Maybe TaskNr,*TSt) // get list of tasknr belonging to events received
getTripletTaskNrs tst=:{hst = hst=:{states}}
# (triplets,states) = getAllTriplets states
= (lowestTaskNr [mkTasknr (getDigits s) \\ ((s,_,_),_) <- triplets | s%(0,5) == "iTask_"],{tst & hst = {hst & states = states}})
where
getDigits s = takeWhile ((<>) '-') (stl (dropWhile ((<>) '_') (mkList s)))
mkTasknr list = reverse (map digitToInt [c \\ c <- list | isDigit c])
lowestTaskNr [] = Nothing
lowestTaskNr [x:xs] = Just (lowest x xs) // lowest number gives highest position in tree
lowest :: TaskNr [TaskNr] -> TaskNr
lowest x [] = x
lowest x [y:ys]
| x < y = lowest x ys
= lowest y ys
startFromRoot :: !GlobalInfo !TaskNr ![TaskNr] !String !(Task a) !*TSt -> ((!Bool,!Int,TaskNr,!String,![TaskNr]),*TSt)
startFromRoot versioninfo eventnr tasknrs message maintask tst
= IF_ClientServer // we are running client server
(IF_ClientTasks
(stopClient eventnr tasknrs message) // client cannot evaluate from root of task tree, give it up
(evaluateFromRoot versioninfo eventnr tasknrs message maintask) tst // sever can evaluate from scratch
)
(evaluateFromRoot versioninfo eventnr tasknrs message maintask tst) // ajax can evaluate from scratch as well
where
stopClient :: !TaskNr ![TaskNr] !String !*TSt -> ((!Bool,!Int,TaskNr,!String,![TaskNr]),*TSt)
stopClient eventnr tasknrs message tst
= ((True,defaultUser,eventnr,message,tasknrs), tst)
evaluateFromRoot :: !GlobalInfo !TaskNr ![TaskNr] !String !(Task a) !*TSt -> ((!Bool,!Int,TaskNr,!String,![TaskNr]),*TSt)
evaluateFromRoot versioninfo eventnr tasknrs message maintask tst
# tst = deleteAllSubTasks versioninfo.deletedThreads tst // delete subtasks being obsolute
# (_,tst) = maintask tst // evaluate main application from scratch
# tst=:{activated} = copyThreadTableToClient tst // copy thread table to client, if applicable
# message = if activated "iTask application finished" message
= (((True,defaultUser,eventnr,message,tasknrs), {tst & activated = activated}))
// ******************************************************************************************************
// Thread Creation and Deletion
// ******************************************************************************************************
......
libraries/iTasks/iTasksHandler.dcl
View file @ 90ea4765
......@@ -35,6 +35,8 @@ derive write Void
| MyHeader HtmlCode // wil replace standard iTask information line
:: HtmlCode :== ![BodyTag] // most programmers will only write bodytags
defaultUser :== 0 // the system starts with this user id...
// Additional global options for tasks, see iData options for the others...
:: GarbageCollect = Collect // garbage collect iTask administration
......
libraries/iTasks/iTasksHandler.icl
View file @ 90ea4765
......@@ -38,8 +38,6 @@ where
// Initial values
defaultUser :== 0 // default id of user
initTst :: !UserId !Lifespan !Lifespan !*HSt -> *TSt
initTst thisUser itaskstorage threadstorage hst
= { tasknr = [-1]
......@@ -376,91 +374,6 @@ where
| thisuser == taskuser = (mkDiv id html,accu)
= ([],accu)
// ******************************************************************************************************
// Event handling for Ajax calls and Sapl handling on the client
// ******************************************************************************************************
// The following functions are defined to support "Ajax technologie" and Client site evaluation of i-Tasks.
// To make this possible, a part of the iTask task tree must be assigened to be a thread such that it can be evaluated as a stand-alone i-Task.
// The programmer has to decide which iTask should become a thread.
// For each event (iData triplet), the system will search for the thread to handle it.
// If a thread task is finished, the parent thread task is activated, and so on.
// Any action requiering the calculation of the Task Tree from scratch will be done one the server
// Watch it: the Client cannot create new Server threads
startAjaxApplication :: !Int !GlobalInfo !(Task a) !*TSt -> ((!Bool,!Int,TaskNr,!String,![TaskNr]),*TSt) // determines which threads to execute and calls them..
startAjaxApplication thisUser versioninfo maintask tst=:{tasknr,options,html,trace,userId}
# tst = copyThreadTableFromClient versioninfo tst // synchronize thread tables of client and server, if applicable
// first determine whether we should start calculating the task tree from scratch starting at the root
# (mbevent,tst) = getTripletTaskNrs tst // see if there are any events, i.e. triplets received
| isNothing mbevent // no events
= startFromRoot versioninfo tasknr [tasknr] "No events, page refreshed" maintask tst
# event = fromJust mbevent // event found
# (table,tst) = ThreadTableStorage id tst // read thread table
| isEmpty table // events, but no threads, evaluate main application from scratch
= startFromRoot versioninfo event [tasknr] "No threads, page refreshed" maintask tst
# (mbthread,tst) = findParentThread event tst // look for thread to evaluate
| isEmpty mbthread // no thread can be found, happens e.g. when one switches from tasks
= startFromRoot versioninfo event [tasknr] "No matching thread, page refreshed" maintask tst
# thread = hd mbthread // thread found
| isMember thread.thrTaskNr versioninfo.deletedThreads // thread has been deleted is some past, version conflict
# tst = copyThreadTableToClient tst // copy thread table to client
= ((True,defaultUser,event,"Task does not exist anymore, please refresh",[tasknr]), tst)
| versioninfo.newThread // newthread added by someone
= startFromRoot versioninfo event [tasknr] "New tasks added, page refreshed" maintask tst
| not (isEmpty versioninfo.deletedThreads) // some thread has been deleted
= startFromRoot versioninfo event [tasknr] "Tasks deleted, page refreshed" maintask tst
| thread.thrUserId <> thisUser // updating becomes too complicated
= startFromRoot versioninfo event [tasknr] ("Thread of user " <+++ thread.thrUserId <+++ ", page refreshed") maintask tst
// ok, we have found a matching thread
# (_,tst=:{activated}) = evalTaskThread thread {tst & html = BT []} // evaluate the thread
| not activated // thread / task not yet finished
# tst = copyThreadTableToClient tst // copy thread table to client
= ((False,thisUser,event,"",[thread.thrTaskNr]),tst) // no further evaluation, aks user for more input
# (mbthread,tst) = findParentThread (tl thread.thrTaskNr) tst // look for thread to evaluate
= doParent mbthread maintask event [thread.thrTaskNr] {tst & html = BT [], options = options} // more to evaluate, call thread one level higher
where
doParent [] maintask event accu tst // no more parents of current event, do main task
= startFromRoot versioninfo event [tasknr:accu] "No more threads, page refreshed" maintask {tst & html = BT []}
doParent [parent:next] maintask event accu tst // do parent of current thread
| parent.thrUserId <> thisUser // updating becomes too complicated
= startFromRoot versioninfo event [tasknr:accu] ("Parent thread of user " <+++ parent.thrUserId <+++ ", page refreshed") maintask {tst & html = BT []}
# (_,tst=:{activated}) = evalTaskThread parent {tst & html = BT []} // start parent
| not activated // parent thread not yet finished
# tst = copyThreadTableToClient tst // copy thread table to client
= ((False,thisUser,event, "",[parent.thrTaskNr:accu]),tst) // no further evaluation, aks user for more input
# (mbthread,tst) = findParentThread (tl parent.thrTaskNr) tst // look for thread to evaluate
= doParent mbthread maintask event [parent.thrTaskNr:accu] {tst & options = options}// continue with grand parent ...
startFromRoot :: !GlobalInfo !TaskNr ![TaskNr] !String !(Task a) !*TSt -> ((!Bool,!Int,TaskNr,!String,![TaskNr]),*TSt)
startFromRoot versioninfo eventnr tasknrs message maintask tst
= IF_ClientServer // we are running client server
(IF_ClientTasks
(stopClient eventnr tasknrs message) // client cannot evaluate from root of task tree, give it up
(evaluateFromRoot versioninfo eventnr tasknrs message maintask) tst // sever can evaluate from scratch
)
(evaluateFromRoot versioninfo eventnr tasknrs message maintask tst) // ajax can evaluate from scratch as well
where
stopClient :: !TaskNr ![TaskNr] !String !*TSt -> ((!Bool,!Int,TaskNr,!String,![TaskNr]),*TSt)
stopClient eventnr tasknrs message tst
= ((True,defaultUser,eventnr,message,tasknrs), tst)
evaluateFromRoot :: !GlobalInfo !TaskNr ![TaskNr] !String !(Task a) !*TSt -> ((!Bool,!Int,TaskNr,!String,![TaskNr]),*TSt)
evaluateFromRoot versioninfo eventnr tasknrs message maintask tst
# tst = deleteAllSubTasks versioninfo.deletedThreads tst // delete subtasks being obsolute
# (_,tst) = maintask tst // evaluate main application from scratch
# tst=:{activated} = copyThreadTableToClient tst // copy thread table to client, if applicable
# message = if activated "iTask application finished" message
= (((True,defaultUser,eventnr,message,tasknrs), {tst & activated = activated}))
// ******************************************************************************************************
// Html Printing Utilities...
// ******************************************************************************************************
......@@ -504,21 +417,4 @@ setSVersionNr user f hst
# (form,hst) = mkStoreForm (Init, nFormId (usersessionVersionNr user) 0 <@ NoForm) f hst
= (form.value,hst)
getTripletTaskNrs :: !*TSt -> *(Maybe TaskNr,*TSt) // get list of tasknr belonging to events received
getTripletTaskNrs tst=:{hst = hst=:{states}}
# (triplets,states) = getAllTriplets states
= (lowestTaskNr [mkTasknr (getDigits s) \\ ((s,_,_),_) <- triplets | s%(0,5) == "iTask_"],{tst & hst = {hst & states = states}})
where
getDigits s = takeWhile ((<>) '-') (stl (dropWhile ((<>) '_') (mkList s)))
mkTasknr list = reverse (map digitToInt [c \\ c <- list | isDigit c])
lowestTaskNr [] = Nothing
lowestTaskNr [x:xs] = Just (lowest x xs) // lowest number gives highest position in tree
lowest :: TaskNr [TaskNr] -> TaskNr
lowest x [] = x
lowest x [y:ys]
| x < y = lowest x ys
= lowest y ys
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