The way RETE works, is you start with a single root node in
your tree. The tree gets wider as you add various column-generator
nodes to it, and starts to get narrowed back down as your
use join-nodes to combine 2 nodes into 1 in the next level of
the tree.
Eventually, the last level will contain a single node, typically
just the last join-node.
Regardless, this last level that only has 1 node is all that
remains in the attachableNodes list onces the do/while has run
its course.
To that last node, we attach the final terminal-node which is
responsible for firing the action of the rule once a tuple reaches
it.
-bob
On Thu, 30 May 2002, Maheedhar (STP) wrote:
> HI ,
>
> In the
> AddRule() method of Builder Class there is a statement
>
> TupleSource lastNode = (TupleSource) attachableNodes.iterator().next();
>
> Coulld U please tell me What the LastNode refers to. What If the
> AttchableNodes set has more than one node and what if it does not have any
> node?
>
>
> Thank you,
> Maheedhar Vishwanathula
>
>
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