The only improvement I can suggest for your rule is to not use collect if you are checking for the non-existance of and object (size == 0). "not" does the job and is much lighter from a performance perspective: Cluster($ipAddressCollection : ipAddressCollection != null) $ipAddressUsage : IPAddressUsage(guid in (IPAddressUsage.CUSTOMER_MANAGEMENT, IPAddressUsage.CUSTOMER_BACKUP, IPAddressUsage.CUSTOMER_PRODUCTION, IPAddressUsage.CUSTOMER_HEARTBEAT) ) not( IPAddress(ipAddressUsage == $ipAddressUsage) from $ipAddressCollection.ipAddresses ) []s Edson 2008/12/17 David Sinclair <dsinclair(a)chariotsolutions.com&gt; > I have the when part of a rule > > Cluster($ipAddressCollection : ipAddressCollection != null) > $ipAddressUsage : IPAddressUsage(guid in > (IPAddressUsage.CUSTOMER_MANAGEMENT, > > IPAddressUsage.CUSTOMER_BACKUP, > > IPAddressUsage.CUSTOMER_PRODUCTION, > > IPAddressUsage.CUSTOMER_HEARTBEAT)) > java.util.LinkedList(size == 0) from collect( IPAddress(ipAddressUsage == > $ipAddressUsage) from $ipAddressCollection.ipAddresses) > > This works fine, but I would like to constrain the IPAddress's usage > within the collect, as opposed to joining. > > Anyone know if this is possible? > > thanks > > dave > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > -- Edson Tirelli JBoss Drools Core Development JBoss, a division of Red Hat @ www.jboss.com _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users