[jboss-jira] [JBoss JIRA] Created: (JBRULES-1179) Premature rule execution

[Markus Reitz (JIRA)]

Premature rule execution
------------------------

                 Key: JBRULES-1179
                 URL: http://jira.jboss.com/jira/browse/JBRULES-1179
             Project: JBoss Rules
          Issue Type: Bug
      Security Level: Public (Everyone can see)
    Affects Versions: 4.0.1
         Environment: JDK 1.5, Mac OS X 10.4
            Reporter: Markus Reitz
         Assigned To: Mark Proctor


Using the rules

  package test
  
  rule "A"
  
    when
      exists(x : String() and
             y : String(this!=x))
           
    then
      System.out.println("x!=y exists.");
  end
  
  rule "B"
  
    when
      not(exists(x : String() and
                 y : String(this!=x)))
           
    then
      System.out.println("x!=y does not exist.");
  end

as input for the following program (java DroolsTest <name of rule file>)

  import org.drools.*;
  import org.drools.compiler.*;
  import org.drools.rule.Package;

  import java.io.*;

  public class DroolsTest {
    private RuleBase        rules;
    private StatefulSession memory;

    public DroolsTest(File file) throws Exception {
      rules =RuleBaseFactory.newRuleBase();
      memory=rules.newStatefulSession();
    
      rules.addPackage(loadPackage(file));
    }

    protected Package loadPackage(File file) throws IOException {
      FileInputStream stream=null;
    
      try {
        stream=new FileInputStream(file);
    
        return(loadPackage(stream));
      }
      finally {
        if (stream!=null)
          stream.close();
      }
    }

    protected Package loadPackage(InputStream stream) throws IOException {
      try {
        PackageBuilder builder=new PackageBuilder();

        builder.addPackageFromDrl(new InputStreamReader(stream));

        return(builder.getPackage());
      }
      catch(Exception ex) {
        throw new IOException();
      }
    }
  
    public StatefulSession getSession() {
      return(memory);
    }
  
    public static void main(String ... args) {
      try {
        DroolsTest test=new DroolsTest(new File(args[0]));
      
        System.out.println("Inserting ...");
      
        test.getSession().insert(new String("42"));
        test.getSession().insert(new String("42"));
        test.getSession().insert(new String("1701"));
        test.getSession().insert(new String("0815"));
        test.getSession().insert(new String("4711"));

        System.out.println("Done.");
      
        System.out.println("Firing rules ...");
      
        test.getSession().fireAllRules();
      
        System.out.println("Done.");
      }
      catch (Exception ex) {
        ex.printStackTrace();
      }
    }
  }

creates the output

  x!=y does not exist.
  Inserting ...
  Done.
  Firing rules ...
  x!=y exists.
  Done.

Premature firing of rules seems to occur ("x!=y does not exist" before fireAllRules is invoked), which is not the expected behaviour.

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