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Re: [jwt-dev] JWT limitations?
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Hi Francisco
At first I though your problem would require generating workflows on the
fly (which will be considered this year in the wake of at least one
research project using JWT). But now I believe you have to separate what
should be handled at runtime by the workflow engine and what should be
modelized at design time.
First, you don't have to "always start a new workflow from any step",
but rather check wether a workflow corresponding to the same case (ex.
the same truck, provided a given truck can't be at the same time in two
different processes) as not already been started. This is done for
example by looking in the current task list whether there is one that
belongs to a process that has an id variable equals to this truck's id.
Then you'll only create a new process if there is not already one. And
if there is already one, you know which task should be done next.
Another solution could be to design the dependancies between all tasks
in the JWT Workflow Editor (for example, before the Balance step, the
Washing step should have been done) and then, for each task, replace it
by a subprocess that checks in the right application of your SI wether
it has been done yet and if not asks the assigned user (ex. the truck
driver) to do it (this replacement could be done automatically with some
code). This is only interesting if applications in your SI already track
such information, and require to integrate them in the workflow engine.
I'm not sure about the "manager" and "checking wether a process can be
started" part of your problem. It may either be answered with a
validation framework, which JWT does not use yet (though it is built on
the EMF technology, whose validation framework would therefore be a
natural choice), or by letting managers change only the workflow state
but not its behaviour (sequence of steps).
Finally, please note that JWT is mainly a tool suite, and that you must
use your own workflow engine - though JWT supports some (like OW2
Bonita) and aims at easily supporting others.
Regards,
Marc Dutoo
Open Wide
JWT co-lead
Francisco Suarez a écrit :
Good evening,
I'm writening from Patagonia, Argentina because I got stucked with a
project. I would like to make a Java aplication with workflows that
could determinate wether a process is able to be launched or not. I
have several sub industrial process that must follow defined steps but
the steps could change depending on the product. What happens is that
somebody could launch a process at any time but I would like to know
if JWT would analyse if all the previous steps were done. The
intresting part of this is that anybody shoul be capable of trying to
start any process at any time but still now I have only seen that JWT
would limitate me to follow a certain secuence of steps always
starting from the first one. For example, I have to procude corn oil
so the trucks would arrive to my manufactures and would stop at the
first barrier. If everithing is ok, it should go to a place where the
truck is washed. Then it should go to a ballance to get it's weight,
then to flush all the corn, then to the same or other ballance to be
weight again, then to get paid and finally to the exit barrier. Now
imagine that the truck driver goes from the firs barrier to the
ballance and he didn't pass trhough the washing process, when the
process of the ballance (written in any language or a peace of
hardware equipment) is going to weight the truck that asks the truck
id it must not allow the truck to be weight and it should inform the
driver which steps were defined for the process and which steps he
actually did.
The idea of this is to be able to change the way things are done on an
easy way for a manager that would't know how to write a single line of
code and would only change the process secuence and everything must
keep on working correctly with the new secuence.
If anyone knows how to solve this, please please please let me know!!!
Thanks in advance and sory for my poor English!!
Excelent project!!
Best wishies!!
Francisco Suarez
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