[rules-users] rule using sliding window

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@kaleconsultants.com> bhushan_bhangale(a)kaleconsultants.com tel: <http://www.plaxo.com/click_to_call?lang=en&src=jj_signature&To=%2... 9206+608+3777&amp;Email=bhushan_bhangale(a)kaleconsultants.com&gt; +91 (0)206 608 3777 <http://www.kaleconsultants.com> http://www.kaleconsultants.com Disclaimer: This email (including any attachments) is intended for the sole use of the recipient/s and may contain material that is CONFIDENTIAL. Any unauthorized disclosure / copying / distribution or forwarding of this message or part is STRICTLY PROHIBITED. If you have erroneously received this message, please delete it immediately and notify the sender. No liability is assumed for any errors and/or omissions in the contents of this message. Information in this message that does not relate to the official business of this Company shall be understood as neither given nor endorsed by it. If verification is required please request a hard-copy version. To know more about Kale Consultants, visit www.kaleconsultants.com -=-=-=-=-=-=-=-=-=-