Re: [rules-users] Implementing Timers With Drools Persistence Enabled
Hi Nick,
You are absolutely right that the timer is not triggered in
CommandBasedStatefulKnowledgeSession (which is used for JPA
persistence). I have spent some time to troubleshoot it. There is some
finding regarding to this problem. Maybe other experts are willing to
solve it.
In org.drools.persistence.processinstance.JPASignalManager, when the
signal is triggered in method
signalEvent(long processInstanceId,
String type,
Object event),
the thread is blocked in
> commandService.execute(command);
I used debugger to trace it, and found that
SingleSessionCommandService.execute(GenericCommand<T>) is
synchronized.
I think the cause of untriggered timer is due to blocked
"commandService.execute(command)" in JPASignalManager.
(I am using drools-5.1.0.M2)
On Tue, Jul 13, 2010 at 6:09 AM, nanic23 <nanic23(a)hotmail.com> wrote:
Hi cafebabe,
Thanks for your comment. I agree with you that work item ids are database
primary keys but in this simple (very simple) case I just decided to
harcoded as I know for a fact that the work item id is 1 because that is the
only work item and each time I run the test the tables are dropped and
recreated. So, there is never more than one row in the workItemInfo table
and the only row always has 1 as its id.
I could have stored the work item id or a work item object as a variable
(like you mentioned) but in this case wouldn't make a difference for the
timers.
Are timers working for you when you use persistence? I do complete work
items by workItem.getId() in all my code (other than this simple example
:)). My problem is NOT completing the work item, my problem is triggering
timers when persistence is enabled. The timers don't even trigger, thing
that should happen before even trying to complete the work item.
Thanks,
Nick.
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