5:12 a.m.
olddave [http://community.jboss.org/people/olddave] created the discussion
"Advice on how to approach CRON based BPMN2 processes"
To view the discussion, visit: http://community.jboss.org/message/619044#619044
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Hi,
I have the need to run Processes, with no human tasks, on a repeating basis, normally 3
times a day, weekdays and excluding holidays. But I also need to run the same tasks on an
ad hoc basis. So if I code a new workitem that is a Start task that uses Quartz scheduler
(thus holidays can be supported) I could not run that on an ad hoc basis. Alternately I
could use a normal Start task and have a diverging gateway as the first node that tests
for a boolean param that represents "run now" it could diverge to a converging
gateway and thus to the actual first node that does real work in the Process, the
alternate path would hit the new Timer workitem that I would have to code that also used
Quartz, this would then hit a converging gateway with the direct run now path to start the
actual Process that does the work I need. Another alternative is theh start task with
Quartz and also an integrated parameter test for pass through.
Any suggestions on how this problem scenario is best solved?
thx.
Ed
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7:12 a.m.
New subject: [jBPM] - Re: Advice on how to approach CRON based BPMN2 processes
Mare Geldenhuys [http://community.jboss.org/people/mgeldenhuys] created the discussion
"Re: Advice on how to approach CRON based BPMN2 processes"
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Hi Ed,
what about adding the job to the Quartz scheduler which kicks of the process? Meaning, the
responsibility of the job which executes in Quartz would be to either create a knowledge
session or get one from somewhere to start a process. This way the schedules are managed
by Quartz but what happens when the job is executed is managed by JBPM. Then you can also
call JBPM to run the process on an ad-hoc basis, without having to handle timers that
should not fire in the process.
Would that work?
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7:28 a.m.
New subject: [jBPM] - Re: Advice on how to approach CRON based BPMN2 processes
olddave [http://community.jboss.org/people/olddave] created the discussion
"Re: Advice on how to approach CRON based BPMN2 processes"
To view the discussion, visit: http://community.jboss.org/message/619102#619102
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That would work, but then I miss out on getting details of processes that are running via
the gwt-console, because the activation of them is outside Drools. I am starting to think
I need the 3rd option a new Start task that has Quartz and a pass through run now option.
That way I can see the Process in the list of running processes and by putting the CRON
expression in a variable be able to see that detail as well through the gwt-console.
Ed
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8:33 a.m.
New subject: [jBPM] - Re: Advice on how to approach CRON based BPMN2 processes
Maciej Swiderski [http://community.jboss.org/people/swiderski.maciej] created the
discussion
"Re: Advice on how to approach CRON based BPMN2 processes"
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Have you tried to have a start event and a timer event that can start the process? That is
valid approach according to BPMN2. I am referring to something similar as is illustrated
on the http://docs.jboss.org/jbpm/v5.1/userguide/ch05.html#d0e1710 Events section jBPM
documentation just instead of message events have a timer event.
So that should do what you describe - time event will fire on every expiration and you can
use default start event to start it whenever you like.
Cheers
Maciej
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9:32 a.m.
New subject: [jBPM] - Re: Advice on how to approach CRON based BPMN2 processes
Mare Geldenhuys [http://community.jboss.org/people/mgeldenhuys] created the discussion
"Re: Advice on how to approach CRON based BPMN2 processes"
To view the discussion, visit: http://community.jboss.org/message/619160#619160
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Using the timer event would not cater for running the process on a complex schedule, since
it only allows having the timer activated after a set amount of time which is specified in
the timer nodes parameter, and does not have the flexibility of being specified to not run
on public holidays.
As I understand putting the CRON expresion in a variable means that you will have to
implement the interpretation of the expresion in the gateway node or "run now"
node to say when the process should execute. Which you could do and then have a timer
event which fires every few minutes and feeds into this node. Or have the "run
now" node be a rule task which makes a decision based on the current time, but then
not use a CRON expression but a DROOLS business rule.
Another option to implement the functionality using a CRON expression, is to create a
second process which manages the creation of scheduled jobs which in turn kick of the
actual process you want to execute. The quartz job will have to communicate via some form
to the console server (I think it exposes some web services) to run the processes. The
main process can then be used to cancel an existing job and its trigger, if one exists and
then add a new job and trigger based on the parameter passed though from the node. You
will have to look at implementing a domain specific task node for this functionality
though.
Mare
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1:41 p.m.
New subject: [jBPM] - Re: Advice on how to approach CRON based BPMN2 processes
Maciej Swiderski [http://community.jboss.org/people/swiderski.maciej] created the
discussion
"Re: Advice on how to approach CRON based BPMN2 processes"
To view the discussion, visit: http://community.jboss.org/message/619241#619241
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I agree that timer event will not cover all requirements right now, but I think it would
be rather clean solution to handle the basic scenario (excluding holidays). To deal with
holiday, you could put rule task just after timer and decide if the particular triggered
time falls down to a holiday, and if so cancel that process instance.
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12:52 a.m.
New subject: [jBPM] - Re: Advice on how to approach CRON based BPMN2 processes
Mare Geldenhuys [http://community.jboss.org/people/mgeldenhuys] created the discussion
"Re: Advice on how to approach CRON based BPMN2 processes"
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Agreed, that would be cleaner.
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4:13 a.m.
New subject: [jBPM] - Re: Advice on how to approach CRON based BPMN2 processes
olddave [http://community.jboss.org/people/olddave] created the discussion
"Re: Advice on how to approach CRON based BPMN2 processes"
To view the discussion, visit: http://community.jboss.org/message/619347#619347
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Hi,
So basically you are saying that to start actual work you have 2 stimuli, the Start node
directly through the XOR converging gateway and a new work item that is a CRON Timer that
produces an internal event that kicks off the process through the XOR converging gateway.
So the Start item could have a boolean variable that causes the XOR converging gateway to
pass through, otherwise is waits for the event from the CRON Timer.
The things not clear to me are:
1. When the Process is invoked without the boolean variable to pass through then does the
CORN Timer just automatically 'run' to check the CRON schedule to check if an
event is due to be produced? My understanding is that a node in the Process do s not just
'run', it is invoked when the workflow 'hits' it?
2. Once the XOR converging gateway is passed won't the Process continue through to the
End node and then finish, thereby leaving no CRON Timer thread to check to see if the next
event is due to be produced? I.e. How do we make the PRocess run permanently? Is this
achieved by a loop path in the workflow itself, maybe into that 1st XOR converging gateway
where it waits for the event to be produced? If so is that std practice?
Thx.
Ed
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Mare Geldenhuys
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olddave