[rules-users] not sure if this is a bug of drools or my bad usage...

[Simon Chen]

Hi all,

An interesting finding:

I have three simple rules:
rule "A2B"
        when
                A()
        then
                insertLogical(new B());
end
rule "B2C"
        when
                B()
        then
                insertLogical(new C());
end
rule "C2B"
        when
                C()
        then
                insertLogical(new B());
end

Basically, once we have an A(), we'll logically insert a B(). Once we
have a B(), we'll logically insert a C(). Once we have a C(), we'll
logically insert a B().

So, I first insert an A(), print all the objects. Retract A(), and
print all the objects. Here's what I got:
com.sample.B@42
com.sample.C@43
com.sample.A@548997d1
after retract!
com.sample.B@42
com.sample.C@43

So, B() and C(), which should be logically depend on A(), somehow are
not retracted. The problem I see is the truth maintenance system allow
B() and C() to depend on each other, thus not affected by losing A().

Is this a bug or my bad usage?

Thanks.
-Simon
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