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<h2><a href="https://docs.jboss.org/author/display/TEIID/Drools+Component+Integration">Drools Component Integration</a></h2>
<h4>Page <b>added</b> by <a href="https://docs.jboss.org/author/display/~van.halbert">Van Halbert</a>
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<h1><a name="DroolsComponentIntegration-DroolsComponentIntegration"></a>Drools Component Integration</h1>
<p>The Drools component integration is an example of integrating business rules with your data. This example will demonstrate how a business rule can be triggered via a User Defined Function (UDF). </p>
<p>The UDF (RulesUDF.java) is written to load one or more drools .drl file(s) that is defined as a system property. An example is:</p>
<ul class="alternate" type="square">
<li><property name="org.teiid.drools.UDF" value="org.jboss.teiid.quickstart.data.MarketData:MyBusinessRules.drl"/></li>
</ul>
<p> where: - value format is: POJO className:.drl file<span class="error">[,POJO className:.drl,…]</span></p>
<p>The format maps the POJO to the rule that will process it.</p>
<p>The caller to the UDF will call the following function method:<br/>
<code><br/>
public static Object performRuleOnData(final String className, final String returnMethodName, final Object returnIfNull, final Object... arguments) </p>
<div class="error"><span class="error">Unknown macro: {
..
}</span> </div>
<p> </code></p>
<p> where:</p>
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<li>className: class name of the POJO to be instantiated and passed to the rules</li>
<li>returnMethodName: name of the method to call on the POJO to get the return value (if one)</li>
<li>returnIfNull: if returnMethodName returns a null value, then default to returnIfNull value</li>
<li>arguments: is a variable number of objects, that must match to the constructor of the POJO.<br/>
So all the arguments will be passed in when the "className" is instantiated.</li>
</ul>
<p>One of the goals of this example was to demonstrate that a UDF could be written generically to integrate with drools. </p>
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