I think I ran into exactly this problem yesterday.
I'll describe what I was doing.
I have a thread in which I batch load my rules script, and then run it.
This is my main rete thread.
rete.executeCommand("(batch xxx.clp)");
rete.executeCommand("(reset)");
rete.executeCommand("(run)");
In another thread from my java code I get the rete instance, and
call assertString to put in some stuff which would fire some rules.
rete.assertString("(justdoit)");
This doesn't work. Doing this in the rules script works.
The problem, I realized, was because in assertString() the engine
tries to lock m_tis to parse the facts. This however will block
because the (run) in the main thread would already have locked it.
So it's a deadlock situation.
The way I found around this was to use Funcall to do assert.
Funcall f = new Funcall("assert", rete);
f.add(new Value(new Fact("justdoit", rete), RU.FACT));
f.execute(rete.getGlobalContext());
This doesn't try to acquire a lock on m_tis since you're already
parsing the fact yourself to create the Fact object.
Of course I'm not sure how you'd do it for a complicated fact,
didn't decipher the parseFact code that far.
It is working for me, of course that doesn't mean I'm right.
Richendra.
Ernest Friedman-Hill wrote:
>
> The most likely explanation is that assertString() is
> throwing an exception that is being ignored in your code. Never write
> Java catch blocks that look like
>
> catch (JessException je) {}
>
> Always at least include a print statement in the catch block!
>
> If this isn't it, though, show me the -smallest possible, complete
> example- the reproduces the problem and we'll go from there.
>
>
> I think [EMAIL PROTECTED] wrote:
> >
> >
> > Hello Jess Users;
> >
> > I have written rules in *.clp file. In this file some rules are fired,
> >
> > after an assertion is done from Java.
> > I have used assertString method defined in Rete.java in
> > myprogram.java.
> > But this assert statement is not asserting the fact, and hence
> > subsequent
> > rules are not fired.
> >
> > Any body can help me how to solve this problem.
> >
> > If I assert initially in *.clp file, then my rules are working fine.
> >
> > Thank you
> > RagJag
> >
>
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