[rules-users] agenda-groups

[gboro54]

I am not currently using agenda-groups. I believe my issue right now is one
of thread safety. A little background: I currently have a thread pulling
messages from a database running on the main thread. In several other
threads, I have drools session being fired every so often. It appears that
there may be a some type of deadlock caused by invoking fireAllRules on one
thread, while another is trying to insert. I am working through right now to
debug the issue. Has anyone else experienced this issue?


Vincent Legendre wrote
> 
>> I am having an issue where I have a catch all
>> retraction rule setup as the lowest salience.
> 
> Not sure to understand that (note that I am not english native ...)
> 
>> I see activations created for the facts but they are never fired.  Any
>> thoughts on why this may happen?
> 
> Send some rules. Activations never fired is just too vague to have a
> single answer.
> If you use agenda groups, may be that the group is simply not on focus ... 
> Add a first rule that set the focus, or set auto-focus for all your "low
> salience" rules, or don't set agenda group for them (their group will be
> the MAIN group).
> 
>> The session is run on a separate thread with fireAllRules called every
>> 1/2
>> second. I have tried syncronizing inserts on the session so that thread
>> would not be in the middle of firing when new facts come in but that does
>> not seem to do anything....
> 
> Why not using fireUntilHalt instead ?
> Run your session.fireUntilHalt in a separate thread, and insert things in
> that session. 
> insert (or update or retract) will wake up the session.
> 
> Of course, one day, you have to call halt() on your session to get out.
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> 


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