Re: [rules-users] Better way to write a constrained collect?
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
$ipAddressCollection.ipAddresses )
[]s
Edson
2008/12/17 David Sinclair <dsinclair(a)chariotsolutions.com>
I have the when part of a rule
Cluster($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
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--
Edson Tirelli
JBoss Drools Core Development
JBoss, a division of Red Hat @ www.jboss.com
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