Yes you should update the fact. Using ksession.update() method.<br>Take a look at the insert method that returns the FactHandle that you need to use later in order to update the fact.<br>Cheers<br><br><div class="gmail_quote">
2011/7/10 Neelesh Deo Dani <span dir="ltr"><<a href="mailto:neeleshdev@yahoo.co.in">neeleshdev@yahoo.co.in</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<table border="0" cellpadding="0" cellspacing="0"><tbody><tr><td style="font:inherit" valign="top"><p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco">Hi,</p><p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco">
I'm using drools expert. When I insert the User object again in the session, after modifying the member variable 'trades' (details mentioned below) the rule doesn't get evaluated. It evaluate the rules only during the 1st insert. Is there a way to trigger the rule evaluation after every insert of the same object (when state is modified)?</p>
<p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco"><br></p><p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco"> I've following declaration and rule.</p><p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco">
<font color="#B70000">------------</font></p><p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco"><span style="color:#b70000">declare</span> User </p>
<p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco"> @timestamp(datetime) </p>
<p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco"> name : String</p>
<p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco"> trades: Integer </p>
<p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco;color:#b70000">end</p><p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco;color:#b70000"><br></p><p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco;color:#b70000">
</p><p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco;color:#009700"><span style="color:#b70000">rule</span><span style="color:#000000"> </span>"Trades"<span style="color:#000000"> </span></p>
<p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco;color:#b70000">when<span style="color:#000000"> </span></p>
<p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco"> $u:User(trades >= 3)</p>
<p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco;color:#b70000">then</p>
<p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco"> System.out.println(<span style="color:#009700">"Trades > 3 for "</span>+ $u.getName());</p>
<p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco;color:#b70000">end<span style="color:#000000"> </span></p><p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco;color:#b70000"><span style="color:#000000">----------</span></p>
<p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco;color:#b70000"><span style="color:#000000">Following is the piece of code:</span></p><p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco;color:#b70000"><span style="color:#000000"><br>
</span></p><p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco;color:#b70000"><span style="color:#000000"></span></p><p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco">StatefulKnowledgeSession session = s.<span style="color:#2700ce">kbase</span>.newStatefulKnowledgeSession();</p>
<p></p><p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco;color:#b70000"><span style="color:#000000"></span></p><p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco">String[] names = <span style="color:#a10067">new</span> String[]{<span style="color:#5100ff">"bob"</span>, <span style="color:#5100ff">"sam"</span>, <span style="color:#5100ff">"john"</span>};</p>
<p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco"></p><p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco">FactType userType = s.<span style="color:#2700ce">kbase</span>.getFactType(<span style="color:#5100ff">"com.sample"</span>, <span style="color:#5100ff">"User"</span> );</p>
<p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco"><br></p><p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco"></p><p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco">Map<String, Object> name2user = <span style="color:#a10067">new</span> HashMap<String, Object>();</p>
<p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco"><span style="white-space:pre-wrap"> </span><span style="color:#a10067">for</span>( String name: names ){ </p>
<p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco"><span style="white-space:pre-wrap"> </span>Object u = userType.newInstance();</p>
<p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco"><span style="white-space:pre-wrap"> </span>userType.set(u, <span style="color:#5100ff">"name"</span>, name);</p>
<p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco"><span style="white-space:pre-wrap"> </span>name2user.put(name, u);</p>
<p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco"><span style="white-space:pre-wrap"> </span>}</p><p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco"><br></p><p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco">
</p><p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco">userType.set(name2user.get(<span style="color:#5100ff">"bob"</span>), <span style="color:#5100ff">"trades"</span>, 1);</p><p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco">
</p><p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco">session.insert(name2user.get(<span style="color:#5100ff">"bob"</span>));</p><p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco"></p><p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco">
session.fireAllRules();</p><p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco"><br></p><p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco"></p><p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco">
<span style="text-decoration:underline">userType</span>.set(name2user.get(<span style="color:#5100ff">"bob"</span>), <span style="color:#5100ff">"trades"</span>, 3);</p><p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco">
</p><p style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px">session.insert(name2user.get(<span style="color:rgb(81, 0, 255)">"bob"</span>));</p><p style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px">
// this insert doesn't evaluate the rule and hence the </p><p style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px">// condition <span style="color:rgb(183, 0, 0)">$u:User(trades >= 3) is not checked</span></p>
<p style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px"><span style="color:rgb(183, 0, 0)"><br></span></p><p style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px"></p><p style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px">
session.fireAllRules();</p><p style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px"><br></p><p style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px"><br></p><p style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px">
Thanks & Regards,</p><p style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px">Neelesh</p><p></p><p></p><p></p><p></p><p></p><p></p><p></p><p></p><p></p><p style="margin:0.0px 0.0px 0.0px 0.0px;font:11.0px Monaco;color:#b70000">
<span style="color:#000000"><br></span></p><p></p></td></tr></tbody></table><br>_______________________________________________<br>
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