[JBoss-user] [JBoss jBPM] - Re: How to suspend and resume a process

2006-02-09 Thread RAlfoeldi
Hi Raj,

don't do it :-)

jBPM implements concurrent execution in a business process sense, NOT in a Java 
Thread sense. As you have to lock on processInstance anyway there is no real 
benefit in spawning two threads as one would always be waiting for the other so 
you might as well just use the jBPM Fork / Join nodes.

If your intention is real concurrency in the execution of long running task 
(find next prime number...) you would have to use a different approach. Send a 
JMS in an Action that triggers the task, return from the node (leaving it in a 
wait state) and let the executing MDB trigger the waiting token when it is 
finished. (Or check out the 3.1 async functionality, I haven't had a look at it 
yet.)

If you have two of these Actions in State nodes after your Fork you have real, 
Thread based concurrency.

If this sounds to complicated, check it out. Its not harder than what you are 
currently trying and it works :-)

Greetings



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[JBoss-user] [JBoss jBPM] - Re: How to suspend and resume a process

2006-02-08 Thread RAlfoeldi
Raj,

sorry if this sounds too intrusive, but what are you trying to accomplish? 

Your approach seems extremely complicated to me and I have the impression that 
you are actually redundantly reimplementing behaviour jBPM already takes care 
of. token.signal() will traverse the processDefinition until it reaches a 
wait-state and only then return, which seems to be very similar to what you are 
trying to achieve. I don't have the time right now to trace it in detail, this 
is just a first impression.

Concerning your concurrency question: you will have to lock on the 
processInstance.

Greetings

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[JBoss-user] [JBoss jBPM] - Re: How to suspend and resume a process

2006-02-08 Thread dharraj
Thanks Rainer,

I do understand that you are a busy man and many many thanks for you time.

The code in question implements parallel split. When process execution reaches 
the split node, threads are created for running each token separately (the main 
thread runs one of the token, the remanning n-1 are executed in new threads). 
Each thread (including the main) simply calls
 token.signal(transitionName)
or if no transition name is specified
token.signal()
until the token ends (the code ends the token when it reaches the join state). 
Before and after singnalling, the process instance is saved using the persistPI 
method. When all tokens end the code sets the join state on the parent token 
and execution returns to the main thread (i.e., parent token).

By the way, I have changed my code not to create/use execution context, but 
simply use token.

FYI: The split and join code mimics jbpm Fork and Join code.

Again, many thanks for you time and help and please reply when ever you have 
time.

Raj

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[JBoss-user] [JBoss jBPM] - Re: How to suspend and resume a process

2006-02-07 Thread dharraj
Forgot to mention that the code to persist process instance starts a 
transaction, saves process instance and commits the transaction. So the signal 
is outside of transaction. I do not think this should matter as I have seen 
same problem when the signal is with in transaction.

Raj


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[JBoss-user] [JBoss jBPM] - Re: How to suspend and resume a process

2006-02-07 Thread dharraj
Hello Rainer,

The execution context is created as follows

  | new ExecutionContext(processInstance.getRootToken());
  | 

Raj


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[JBoss-user] [JBoss jBPM] - Re: How to suspend and resume a process

2006-02-06 Thread dharraj
Hello,

Few questions regarding the following remark.
anonymous wrote : Or look at 3.1alpha. afaik, there is functionality to suspend 
and resume. It is alpha, so the code might not be finished.

Will this capability allow me to pause in middle of execution, save process 
instance, exit the application completely, run a different application that 
retrieves the saved process instance, and rerun from where it exactly left off?

Thanks for your time and help.

Raj



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[JBoss-user] [JBoss jBPM] - Re: How to suspend and resume a process

2006-02-06 Thread RAlfoeldi
Hi Raj,

you can do that with 3.0.2. All you need is a State node. That will return, 
stopping the process and leaving everything 'as is' until you trigger the 
processInstance / token by whatever means are applicable to your app.

Greetings


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[JBoss-user] [JBoss jBPM] - Re: How to suspend and resume a process

2006-02-06 Thread dharraj
Hello Rainer,

Thanks for you reply. I know we have been over this before. I am trying to test 
with simple process definition and it does not work.

Here is my test process:
?xml version=1.0 encoding=UTF-8?
  | 
  | process-definition
  |   xmlns=http://jbpm.org/3/jpdl;  
xmlns:xsi=http://www.w3.org/2001/XMLSchema-instance;
  |   xsi:schemaLocation=http://jbpm.org/3/jpdl 
http://jbpm.org/xsd/jpdl-3.0.xsd;
  |   name=dbexample
  |start-state name=start
  |   transition name=tr1 to=first/transition
  |/start-state
  |end-state name=end/end-state
  |state name=first
  |  transition name=tr1 to=second/transition   
  |  event type=node-enter
  |action class=jpl.mipl.pgs.test.Testing
  |  leaveNodefalse/leaveNode
  |  waitTimeBound2000/waitTimeBound
  |/action
  |  /event
  |/state
  |state name=second
  |  transition name=tr1 to=end/transition
  |  event type=node-enter
  |action class=jpl.mipl.pgs.test.Testing name=
  | halttrue/halt
  | leaveNodefalse/leaveNode
  | waitTimeBound1000/waitTimeBound
  |  /action
  |  /event
  |/state
  | /process-definition
  | 
My main program simply does the following
while (!executionContext.getToken().hasEnded())
  | {
  |   ContextInstance ci = 
executionContext.getProcessInstance().getContextInstance();
  |   synchronized(ci)
  |   {
  | if (ci.hasTransientVariable(jpl.mipl.pgs.test.Testing.HALT))
  | {
  |   System.err.println(Halting 
token=+executionContext.getToken().getFullName()+
  |executed upto 
token=+executionContext.getToken().getName());
  |   return;
  | }
  |   }
  |   //... code that persistes process instance
  |   executionContext.getToken().signal()
  |   //.code that persists process instance
  |   ..
  | 
The action in state 'second' sets the halt variable and returns the control to 
the above loop. At this point the main prints the System.err message and 
exists. I than rerun the main but this time telling it that it needs to load 
the process instance with given id from the persistent store. The process 
instanace loads without any errors, but I get following excepition when I try 
to examine the token


  | Exception in thread main org.hibernate.LazyInitializationException: 
failed to lazily initialize a collection of role: 
org.jbpm.graph.exe.Token.children, no session or session was closed
  | at 
org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:358)
  | at 
org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:350)
  | at 
org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:343)
  | at 
org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
  | at 
org.hibernate.collection.PersistentMap.entrySet(PersistentMap.java:206)
  | at org.jbpm.graph.exe.Token.getActiveChildren(Token.java:366)
  | at jpl.mipl.pgs.jbpm.JBPMExeEngine.execute(JBPMExeEngine.java:447)
  | at jpl.mipl.pgs.jbpm.JBPMExeEngine.main(JBPMExeEngine.java:518)
  | 
  | 

This is just with single token, I still need to test with running (children) 
tokens in parallel and being able to accomplish this.

By the way I was advised to look into async action for this very thing, what do 
you recommend?

Thanks
Raj


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[JBoss-user] [JBoss jBPM] - Re: How to suspend and resume a process

2005-12-22 Thread RAlfoeldi
Hi Vincent,

its basically a question of 'does your node signal the next transition by 
itself or does it return?'

jbpm will execute a token until a node returns from the signal() method. (if 
your process forks it will follow all paths and then return.) if you want to 
decide at runtime to suspend the process use a node with an action and either 
return from the execute() method or call a transition depending on what you 
want to do.

does this answer your question?

Greetings Rainer

@zhgd: 'I'm also waiting ...'? Ah, yes. And what for?


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[JBoss-user] [JBoss jBPM] - Re: How to suspend and resume a process

2005-12-22 Thread mdonato
Hi all,

i think my question is like yours, but a little different.

I don't want to handle it, i need a delay time like 20 days or any thing else, 
and i've tried to do it with timer tag on a simple node tag!

but the timer has no actions and when the flow reachs this node, the delay 
timer dont work and bypass the node with the default transition, going to the 
next task !

if anyone knows how can i do it, without handling it and without a explicity 
signalling it, i'll be very happy!

thanks

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[JBoss-user] [JBoss jBPM] - Re: How to suspend and resume a process

2005-12-22 Thread RAlfoeldi
Hi mdonato,

why doesn't the timer work? or better: how are the timers you tried defined?

Rainer

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[JBoss-user] [JBoss jBPM] - Re: How to suspend and resume a process

2005-12-22 Thread mdonato
Hi,

i'm trying to do another test with node type state ... i've done it with node 
type node and dont work !!!

i'll put the result of the test here soon !!

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[JBoss-user] [JBoss jBPM] - Re: How to suspend and resume a process

2005-12-22 Thread mdonato
Hi,

i've tried this one:
   state name=aguarda
  |   timer duedate=3 minutes transition=confirmar-fechamento/timer
  |   transition name=confirmar-fechamento 
to=confirma-fechamento/transition
  |/state
  | 

and this one :
   node name=aguarda
  |   timer duedate=3 minutes transition=confirmar-fechamento/timer
  |   transition name=confirmar-fechamento 
to=confirma-fechamento/transition
  |/node
  | 

and dont works  how can i do a delay ?

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[JBoss-user] [JBoss jBPM] - Re: How to suspend and resume a process

2005-12-22 Thread RAlfoeldi
Did you check if the timer was created (check the Timer table in the db)?

Is your SchedulerThread running?

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[JBoss-user] [JBoss jBPM] - Re: How to suspend and resume a process

2005-12-22 Thread mdonato
Timer table was not created !

And my timer thread is running !!!

here is the part of the flow

   task-node name=confirma-abertura
  |   task name=task1 description=Confirmar abertura de admissoes 
swimlane=Supervisor-Cliente/task
  |   event type=node-leave
  |  action name=notificar 
class=br.com.glr.jbpm.handlers.MailToSwimlaneActionHandler config-type=bean
  | from[EMAIL PROTECTED]/from
  | 
swimlaneNamesSupervisor-Celula;Diretor-Operacional;Diretor-Geral;Gerente-Cliente;Operador-Celula/swimlaneNames
  | subjectConfirmada a abertura de admissoes/subject
  | message/message
  |  /action
  |   /event
  |   transition name=confirmar to=aguarda /transition
  |/task-node
  |state name=aguarda
  |   timer duedate=3 minutes transition=confirmar-fechamento/timer
  |   transition name=confirmar-fechamento 
to=confirma-fechamento/transition
  |/state
  |task-node name=confirma-fechamento
  |   task name=confirma description=Confirmar fechamento de admissoes 
swimlane=Supervisor-Cliente /task
  |   event type=node-leave
  |  action name=notificar 
class=br.com.glr.jbpm.handlers.MailToSwimlaneActionHandler config-type=bean
  | from[EMAIL PROTECTED]/from
  | 
swimlaneNamesSupervisor-Celula;Diretor-Operacional;Diretor-Geral;Gerente-Cliente;Operador-Celula/swimlaneNames
  | subjectConfirmado o fechamento de admissoes/subject
  | message/message
  |  /action
  |   /event
  |   transition name=sim to=termino/transition
  |/task-node
  | 

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[JBoss-user] [JBoss jBPM] - Re: How to suspend and resume a process

2005-12-22 Thread RAlfoeldi
The timer TABLE was not created? Or there is no entry in the existing table?

If you don't have a timer table you don't have timers, but then you should have 
lots of exceptions...

Try setting a break point on the enter-node event and check whats happening. I 
do use timers extensively and they work perfectly... but I don't define them in 
the workflow, they're dynamically generated.

But from what I've understood of timers they ought to be created (in the db) on 
the enter-node event and removed (canceled) on the leave-node event. Actually 
to actions are implictly defined for these events. = set a break point and 
have a look.

Rainer

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[JBoss-user] [JBoss jBPM] - Re: How to suspend and resume a process

2005-12-22 Thread mdonato
The table exists ... and i've made extensive teste with it in task tags  
and i know that when you put a timer tag , it creates those events  but in 
a node tag it dont works 

the other test of the timer is this:
   task-node name=task1
  |   task name=task1 swimlane=direct
  |  timer duedate=30 seconds repeat=yes name=lembrete
  | action config-type=field 
class=br.com.glr.jbpm.handlers.MailToSwimlaneActionHandler 
  |from[EMAIL PROTECTED]/from
  |subjectLembrete/subject
  |messageLembrete de novo/message
  | /action
  |  /timer
  |   /task
  |   transition name=tr1 to=end1/transition
  |/task-node
  | 

but its a task timer !!!

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[JBoss-user] [JBoss jBPM] - Re: How to suspend and resume a process

2005-12-22 Thread mdonato
All right ... the timer is created in table  and runs as it was supposed to 
run  but the node is left and the timer still run  i need to suspend 
the flow ... after the time has due, then goes to transition !!! and it is not 
happening  what is wrong?

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[JBoss-user] [JBoss jBPM] - Re: How to suspend and resume a process

2005-12-21 Thread RAlfoeldi
Add a wait state in your workflow and signal the token later on.

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[JBoss-user] [JBoss jBPM] - Re: How to suspend and resume a process

2005-12-21 Thread kukeltje
Or look at 3.1alpha. afaik, there is functionality to suspend and resume. It is 
alpha, so the code might not be finished.  

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[JBoss-user] [JBoss jBPM] - Re: How to suspend and resume a process

2005-12-21 Thread znjqolf
Thanks for you reply..

to RAlfoeldi:
   I mean i want to control this process instance, suspend and resume it at any 
time or at any step.

to kukeltje:
   Thanks, i will look at it.Maybe it work..

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[JBoss-user] [JBoss jBPM] - Re: How to suspend and resume a process

2005-12-21 Thread zhgd
I'm also waiting ...

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