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