[rules-users] Drools Flow :Persistence Problem : Restore StatefulKnowledgeSession from database

[Kris Verlaenen]

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 at 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
> 
> 
> ______________________________________________________________________




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