HI, I am new to Drools (and rule engine in general). I was trying to
write a very simple rule but was stuck. I hope someone here can help
me with my questions:
1. How do I write a condition such that it is a comparison between two
(or more) columns of a fact? For example,
rule "BuyWhenMarketPriceAndVolumeMatchesRule"
when
offer : StockOffer( price >= simpleMovingAverage )
then
offer.setAction(StockOffer.Action.ACTION_BUY);
end
where price and simpleMovingAverage are both attributes of the
StockOffer object.
2. How do I compare between a BigDecimal and a literal numeral? For example,
rule "BuyWhenMarketPriceAndVolumeMatchesRule"
when
offer : StockOffer( price >= 90 )
then
offer.setAction(StockOffer.Action.ACTION_BUY);
end
where price is a java.math.BigDecimal.
3. How do I "pass" variables into the working memory so that it can be
used for rule conditions? For example:
rule "BuyWhenMarketPriceAndVolumeMatchesRule"
when
offer : StockOffer( price >= $someVariableSetInWorkingMemory )
then
offer.setAction(StockOffer.Action.ACTION_BUY);
end
where $someVariableSetInWorkingMemory is a variable passed into the
working memory.
Please let me know if some of my questions doesn't make sense in a
rule engine...
Thanks
Charles
--
http://del.icio.us/chancharles
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