Re: [rules-users] Drools Flow :Persistence Problem : Restore StatefulKnowledgeSession from database
Let's say where we don't need timers - in those cases one can create (create only
if its not there) a global session (create the sessioninfo at the drools startup - store
the session primary key somewhere) - reuse this session across everywhere?
Vijay
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On
Behalf Of Kris Verlaenen
Sent: Monday, November 16, 2009 5:12 PM
To: Rules Users List; Pardeep.Ruhil(a)lntinfotech.com
Subject: Re: [rules-users] Drools Flow :Persistence Problem : Restore
StatefulKnowledgeSession from database
Pardeep,
The behavior you are describing is indeed correct. The session in this
case is a global session, meaning that it will be used for all process
instances. Note however that, unless you are using timers, all other
state (process instance state, work items, etc.) is persisted separately
and the session state will basically be empty.
It is also possible to have one session per process instance (or
whatever partitioning you like). A session has a unique id (which you
can specify when reloading the session). You'll then have to load the
right session before continuing the execution of your process instance.
Kris
Quoting Pardeep.Ruhil(a)lntinfotech.com:
Hi Salaboy,
Thanks for you replying.
Yes, of course it is storing multiple process instance Id in the
database.
But, what I feel is that it will fail when I am trying to run two
workflow
at the same time simultaneously, using the same code by dynamically
providing the workflow name and the parameters for each of them.
Ideally there should be two entries for the StatfulKnowledgeSession
object
because when I try to load the StatefulKnowledgeSession object from
the
database it will give me the session object of the workflow which is
last
executed.
For example lets suppose I have two workflow 1 and 2 having two
humantask
in each of them . So when I finish the first Human Task of both
workflow
one by one. SessionInfo present in the database is of workflow 2
(if 2
is executed last). Because there is no field in the sessioninfo
entity of
the database regarding to which workflow it belongs to. Am I right ?
So when I try to finish the 1st workflow by executing the 2nd
humantask
left in it , I need to reload the StatfulKnowledgeSession object from
the
database. As there is no way of distinguishing that the session
object
store in the database is of which workflow , there might be a problem
as I
may get the ksession object of 2nd workflow.
In case of Process Instance it is fine , because there is a field
'processId' which will distinguish which processInstanceId belongs to
which worklowId or processId.
But in case of Session , there is noting as such.
I don't what I am saying is handled in drools persistence. Please let
me
know if it there or not.
Thanks & Regards
Pardeep Ruhil
______________________________________________________________________
Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users