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Integration with Drools
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created by <a href="http://community.jboss.org/people/roxy1987">roxy1987</a> in <i>jBPM</i> - <a href="http://community.jboss.org/message/576585#576585">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hi, I am trying to invoke the rules with jBPM. My class definition is following :</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>package com.jboss.dvd.seam;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import org.drools.PackageIntegrationException;<br/>import org.drools.RuleBase;<br/>import org.drools.RuleBaseFactory;<br/>import org.drools.RuleIntegrationException;<br/>import org.drools.WorkingMemory;<br/>import org.drools.compiler.DrlParser;<br/>import org.drools.compiler.DroolsParserException;<br/>import org.drools.compiler.PackageBuilder;<br/>import org.drools.lang.descr.PackageDescr;<br/>import org.drools.reteoo.*;<br/>import org.drools.rule.InvalidPatternException;<br/>import org.drools.rule.Package;<br/>import org.jbpm.context.exe.ContextInstance;<br/>import org.jbpm.graph.def.ActionHandler;<br/>import org.jbpm.graph.exe.ExecutionContext;<br/>import java.io.*;<br/>import java.util.Iterator;<br/>import java.util.List;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>public class FireRulesActionHandler implements ActionHandler {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>  private static final long serialVersionUID = 1L;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>  public List objectNames;<br/>  public static String ruleFile;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>  /**<br/>   * The FireRulesActionHandler gets variables from the Instance, and asserts<br/>   * them into the Rules Engine and invokes the rules.<br/>   */<br/>  public void execute(ExecutionContext executionContext) throws Exception {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    // load up the rulebase<br/>    RuleBase ruleBase = readRule();<br/>    WorkingMemory workingMemory = ruleBase.newWorkingMemory();</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    // load the data<br/>    Object object = null;<br/>    System.out.println(objectNames.toString());</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    Iterator iter = objectNames.iterator();<br/>    String objectName = "";<br/>    ContextInstance ci = executionContext.getContextInstance();<br/>    while (iter.hasNext()) {<br/>      objectName = (String) iter.next();<br/>      object = ci.getVariable(objectName);<br/>      System.out.println("object name is: " + objectName);<br/>      // assert the object into the rules engine<br/>      workingMemory.assertObject(object);<br/>    }<br/>    // assert the contextInstance so that it may be used to set results<br/>    workingMemory.assertObject(ci);<br/>    workingMemory.fireAllRules();</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>  }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>  /**<br/>   * Please note that this is the "low level" rule assembly API.<br/>   */<br/>  private static RuleBase readRule() throws IOException, DroolsParserException, RuleIntegrationException, PackageIntegrationException, InvalidPatternException {<br/>    // read in the source<br/>    Reader reader = new InputStreamReader(FireRulesActionHandler.class.getResourceAsStream(ruleFile));<br/>    DrlParser parser = new DrlParser();<br/>    PackageDescr packageDescr = parser.parse(reader);</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    // pre build the package<br/>    PackageBuilder builder = new PackageBuilder();<br/>    builder.addPackage(packageDescr);<br/>    Package pkg = builder.getPackage();</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    // add the package to a rulebase<br/>    RuleBase ruleBase = RuleBaseFactory.newRuleBase();<br/>    ruleBase.addPackage(pkg);<br/>    return ruleBase;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>  }<br/>}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>1. First thing is that, it is not able to recognize the function newWorkingMemory().</p><p>2. Secondly the function assertObject(Object) is also reported undefined.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Please Help.</p><p>Thanks</p></div>
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