[rules-users] rule using sliding window

[Bhushan Bhangale]

I am using Drools 5. I am struggling to write rule for this logic -

If a stock price changes more than 10% within an hour then report the
change.

I understand I have to use sliding window feature but unable to write the
rule.

For example I got an update for IBM stock @ 12:30 for price 100 and then
another update IBM stock @ 12:35 for price 111. Since the time difference is
within an hour and the change is also greater than 10% I want to report this
price change.

 

Stock class -

 

Public class Stock {

   Private String stock;

   Private double price;

   Private Date time;

   Private double priceChange;

   Private Boolean highlight;

}

 

 

rule "Stock Price change more than 10% within an hour"

 

when

 

then

set the priceChange attribute of Stock object

set highlight to true     

end

 

 

Secondly if the window is large and number of records coming in is high then
could there be a memory issue?

 

Also since every record is getting stored in database, can I not use the
database directly instead of sliding window?

 

Thanks

 


Mr. Bhangale Bhushan
Associate Manager
Kale Consultants Ltd.
 <mailto:bhushan_bhangale at kaleconsultants.com>
bhushan_bhangale at kaleconsultants.com
tel:
<http://www.plaxo.com/click_to_call?lang=en&src=jj_signature&To=%2B91+%280%2
9206+608+3777&Email=bhushan_bhangale at kaleconsultants.com> +91 (0)206 608
3777
 <http://www.kaleconsultants.com> http://www.kaleconsultants.com 

 


 


 

 




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