Re: [rules-users] question on rule efficiency
Barry,
For your example, there would be no difference really, because Drools
detects that "putContract" is a pattern binding and that "strikePrice"
is a
field of "putContract". So, in your version number, it will automatically
generate a binding for the field and behind the scenes, it will behave
exactly like version 2.
Although, it is IMPORTANT to note that, if "putContract" was not a
pattern binding (for instance, it could be a field binding itself) or if you
had used deeper nested accessors, like "person.address.street", drools would
not be able to optimize and it would be more expensive to execute.
[]s
Edson
2008/6/5 Barry Kaplan <groups1(a)memelet.com>:
When the value of a property is compared across two instances, is it better
to create variables for the properties, or is using the object.property for
the comparison equivalent?
Here's an example: I need to match based on the strikePrice property. Is
either version better than the other?
version 1)
putContract : OptionInstrument(
optionType == OptionType.PUT)
callContract : OptionInstrument(
optionType == OptionType.CALL,
strikePrice > putContract.strikePrice)
// compare using navigation
version 2)
putContract : OptionInstrument(
optionType == OptionType.PUT,
putStrikePrice : strikePrice)
// delcare the variable
callContract : OptionInstrument(
optionType == OptionType.CALL,
strikePrice > putStrikePrice)
// compare using variable
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Edson Tirelli
JBoss Drools Core Development
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