[jboss-jira] [JBoss JIRA] Created: (JBRULES-532) Query feature doesnt seem to work if there is more than one query.

[Sridhar Chandrasekharan (JIRA)]

Query feature doesnt seem to work if there is more than one query.
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                 Key: JBRULES-532
                 URL: http://jira.jboss.com/jira/browse/JBRULES-532
             Project: JBoss Rules
          Issue Type: Bug
      Security Level: Public (Everyone can see)
            Reporter: Sridhar Chandrasekharan
         Assigned To: Mark Proctor


Consider the following:-
*******************************************************************************
1) Foo.java
package com.foo;

public class Foo {
	private int a;
	private int b;
	public Foo(int a, int b) {
		super();
		this.a = a;
		this.b = b;
	}
	public boolean test()
	{
		return (a > b);
	}
	public int getA() {
		return a;
	}
	public int getB() {
		return b;
	}
	
}
*******************************************************************************************
2) FooTest.java

package com.foo;
import java.io.InputStreamReader;
import java.io.*;
import java.util.*;
 
import org.drools.RuleBase;
import org.drools.RuleBaseFactory;
import org.drools.WorkingMemory;
import org.drools.compiler.PackageBuilder;
import org.drools.rule.Package;
import org.drools.QueryResults;
import org.drools.QueryResult;

public class FooTest {
	
	
	/**
	 * This is a sample file to launch a rule package from a rule source file.
	 */
	    public static final void main(String[] args) {
	        try {
	        	
	        	//load up the rulebase
	            RuleBase ruleBase = readRule();
	            WorkingMemory workingMemory = ruleBase.newWorkingMemory();
	            
	            //go !
	            
	            workingMemory.fireAllRules();   
	            QueryResults results = workingMemory.getQueryResults( "Foo query" );
	            if(results == null)
	            {
	            	System.out.println("Result is null");
	            	return;
	            }
	            System.out.println( "we have " + results.size() );

	            for ( Iterator it = results.iterator(); it.hasNext(); ) {
	                QueryResult result = ( QueryResult ) it.next();
	                Foo foo = ( Foo ) result.get( "foo" );
	                System.out.println( "A="+foo.getA() + " B=" + foo.getB());
	            }
	            
	        } catch (Throwable t) {
	            t.printStackTrace();
	        }
	    }

	    /**
	     * Please note that this is the "low level" rule assembly API.
	     */
		private static RuleBase readRule() throws Exception {
			//read in the source
			Reader source = new InputStreamReader( FooTest.class.getResourceAsStream( "/Foo.drl" ) );
			
			//optionally read in the DSL (if you are using it).
			//Reader dsl = new InputStreamReader( DroolsTest.class.getResourceAsStream( "/mylang.dsl" ) );

			//Use package builder to build up a rule package.
			//An alternative lower level class called "DrlParser" can also be used...
			
			PackageBuilder builder = new PackageBuilder();

			//this wil parse and compile in one step
			//NOTE: There are 2 methods here, the one argument one is for normal DRL.
			builder.addPackageFromDrl( source );

			//Use the following instead of above if you are using a DSL:
			//builder.addPackageFromDrl( source, dsl );
			
			//get the compiled package (which is serializable)
			Package pkg = builder.getPackage();
			
			//add the package to a rulebase (deploy the rule package).
			RuleBase ruleBase = RuleBaseFactory.newRuleBase();
			ruleBase.addPackage( pkg );
			return ruleBase;
		}
	
	}
**************************************************
3) Foo.drl
#created on: Oct 9, 2006
package com.foo


rule "Initialization rule"
	when
		#conditions
	then 
		assert(new Foo(1,1));
		assert(new Foo(2,1));
		assert(new Foo(2,3));
		assert(new Foo(3,2));
		assert(new Foo(3,4));
		assert(new Foo(4,3));
end
		


query "Foo query"
	foo : Foo()
end

****************************************
The output is as follows:-
we have 6
A=1 B=1
A=2 B=1
A=2 B=3
A=3 B=2
A=3 B=4
A=4 B=3
*****************************************

Now add another query to the Foo.drl file

query "Bar query"
	foo : Foo()
end

and the output is 

Result is null

Adding a second query caused the first query to stop working properly.

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