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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I am using Drools 5. I am struggling to write rule for this
logic -</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>If a stock price changes more than 10% within an hour then
report the change.</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I understand I have to use sliding window feature but unable
to write the rule.</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>For example I got an update for IBM stock @ </span></font><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>12:30</span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> for price
100 and then another update IBM stock @ </span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>12:35</span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> 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.</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Stock class -</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Public class Stock {</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> Private String stock;</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> Private double price;</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> Private Date time;</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> Private double priceChange;</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> Private Boolean highlight;</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>}</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>rule "Stock Price change more than 10% within an
hour"</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>when</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>then</span></font></p>
<p class=MsoNormal style='text-indent:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>set the priceChange attribute of
Stock object</span></font></p>
<p class=MsoNormal style='text-indent:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>set highlight to true
</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>end</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Secondly if the window is large and number of records coming
in is high then could there be a memory issue?</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Also since every record is getting stored in database, can I
not use the database directly instead of sliding window?</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thanks</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
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<p class=MsoNormal><b><font size=1 color="#4e81c4" face=Verdana><span
style='font-size:8.0pt;font-family:Verdana;color:#4E81C4;font-weight:bold'>Mr.
Bhangale Bhushan</span></font></b><font size=1 color="#4e81c4" face=Verdana><span
style='font-size:8.0pt;font-family:Verdana;color:#4E81C4'><br>
<i><span style='font-style:italic'>Associate Manager</span></i><br>
<strong><b><font face=Verdana><span style='font-family:Verdana'>Kale
Consultants Ltd.</span></font></b></strong><br>
<a href="mailto:bhushan_bhangale@kaleconsultants.com"><font color="#4e81c4"><span
style='color:#4E81C4;text-decoration:none'>bhushan_bhangale@kaleconsultants.com</span></font></a><br>
tel: <a
href="http://www.plaxo.com/click_to_call?lang=en&src=jj_signature&To=%2B91+%280%29206+608+3777&Email=bhushan_bhangale@kaleconsultants.com"
target="_blank" title="Click to call. Cheap rates & no headset required!"><font
color="#4e81c4"><span style='color:#4E81C4;text-decoration:none'>+91 (0)206
608 3777</span></font></a><br>
<a href="http://www.kaleconsultants.com" target="_blank"><font color="#4e81c4"><span
style='color:#4E81C4;text-decoration:none'>http://www.kaleconsultants.com</span></font></a>
</span></font></p>
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