[drools-user] activation not cancelled when using eval()

Fri, 07 Apr 2006 12:31:27 -0700 

Here are my rules:

rule "Authorize Resources"
   salience 100
   when
       $r : Resource()
       $g : Group(resources contains $r)
    then
       AuthorizedResource auth = new AuthorizedResource();
       auth.resource = $r;
       assert(auth);
end

rule "Create block rules for unauthorized resources in same network"
   when
       $r : Resource()
       $pr : Principal()
       not AuthorizedResource(resource == $r)
       eval (!Collections.disjoint($r.networks, $pr.networks))
   then
       BlockRule block = new BlockRule();
       block.resource = $r;
       assert(block);
end
When AuthorizedResources are asserted by the first rule, I expect that activations of the second should be cancelled, since it makes the "not" condition false. But the cancellations don't occur. Here's the output:
[BeforeActivationFired: rule=Authorize Resources; tuple=[fid:16:16], [fid:2:2], [fid:7:7], [fid:24:24], ] 
[ObjectAsserted: handle=[fid:25:25]; [EMAIL PROTECTED]
[AfterActivationFired(24): rule=Authorize Resources]
[BeforeActivationFired: rule=Authorize Resources; tuple=[fid:12:12], [fid:2:2], [fid:7:7], [fid:24:24], ] 
[ObjectAsserted: handle=[fid:26:26]; [EMAIL PROTECTED]
[AfterActivationFired(24): rule=Authorize Resources]
[BeforeActivationFired: rule=Create block rules for unauthorized resources in same network; tuple=[fid:12:12], [fid:23:23], ] 
[ObjectAsserted: handle=[fid:27:27]; [EMAIL PROTECTED]
[AfterActivationFired(23): rule=Create block rules for unauthorized resources in same network] [BeforeActivationFired: rule=Create block rules for unauthorized resources in same network; tuple=[fid:8:8], [fid:23:23], ] 
[ObjectAsserted: handle=[fid:28:28]; [EMAIL PROTECTED]
[AfterActivationFired(23): rule=Create block rules for unauthorized resources in same network] [BeforeActivationFired: rule=Create block rules for unauthorized resources in same network; tuple=[fid:5:5], [fid:23:23], ] 
[ObjectAsserted: handle=[fid:29:29]; [EMAIL PROTECTED]
[AfterActivationFired(23): rule=Create block rules for unauthorized resources in same network] [BeforeActivationFired: rule=Create block rules for unauthorized resources in same network; tuple=[fid:1:1], [fid:23:23], ] 
[ObjectAsserted: handle=[fid:30:30]; [EMAIL PROTECTED]
[AfterActivationFired(23): rule=Create block rules for unauthorized resources in same network]
However, if I comment out the eval() line, the cancellations do occur. Like this: 

rule "Create block rules for unauthorized resources in same network"
   when
       $r : Resource()
       $pr : Principal()
       not AuthorizedResource(resource == $r)
       #eval (!Collections.disjoint($r.networks, $pr.networks))
   then
       BlockRule block = new BlockRule();
       block.resource = $r;
       assert(block);
end

... I get:
[BeforeActivationFired: rule=Authorize Resources; tuple=[fid:16:16], [fid:2:2], [fid:7:7], [fid:24:24], ] <==[ActivationCancelled(23): rule=Create block rules for unauthorized resources in same network; tuple=[fid:16:16], [fid:23:23], ] 
[ObjectAsserted: handle=[fid:25:25]; [EMAIL PROTECTED]
[AfterActivationFired(24): rule=Authorize Resources]
[BeforeActivationFired: rule=Authorize Resources; tuple=[fid:12:12], [fid:2:2], [fid:7:7], [fid:24:24], ] <==[ActivationCancelled(23): rule=Create block rules for unauthorized resources in same network; tuple=[fid:12:12], [fid:23:23], ] 
[ObjectAsserted: handle=[fid:26:26]; [EMAIL PROTECTED]
[AfterActivationFired(24): rule=Authorize Resources]
[BeforeActivationFired: rule=Create block rules for unauthorized resources in same network; tuple=[fid:21:21], [fid:23:23], ] 
[ObjectAsserted: handle=[fid:27:27]; [EMAIL PROTECTED]
[AfterActivationFired(23): rule=Create block rules for unauthorized resources in same network] [BeforeActivationFired: rule=Create block rules for unauthorized resources in same network; tuple=[fid:14:14], [fid:23:23], ] 
[ObjectAsserted: handle=[fid:28:28]; [EMAIL PROTECTED]
[AfterActivationFired(23): rule=Create block rules for unauthorized resources in same network] [BeforeActivationFired: rule=Create block rules for unauthorized resources in same network; tuple=[fid:8:8], [fid:23:23], ] 
[ObjectAsserted: handle=[fid:29:29]; [EMAIL PROTECTED]
[AfterActivationFired(23): rule=Create block rules for unauthorized resources in same network] [BeforeActivationFired: rule=Create block rules for unauthorized resources in same network; tuple=[fid:5:5], [fid:23:23], ] 
[ObjectAsserted: handle=[fid:30:30]; [EMAIL PROTECTED]
[AfterActivationFired(23): rule=Create block rules for unauthorized resources in same network] [BeforeActivationFired: rule=Create block rules for unauthorized resources in same network; tuple=[fid:4:4], [fid:23:23], ] 
[ObjectAsserted: handle=[fid:31:31]; [EMAIL PROTECTED]
[AfterActivationFired(23): rule=Create block rules for unauthorized resources in same network] [BeforeActivationFired: rule=Create block rules for unauthorized resources in same network; tuple=[fid:1:1], [fid:23:23], ] 
[ObjectAsserted: handle=[fid:32:32]; [EMAIL PROTECTED]
[AfterActivationFired(23): rule=Create block rules for unauthorized resources in same network]
Note how the assertion of the AuthorizedResource now triggers the activation cancelled. Am I missing something?

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