[rules-dev] Locating objects by query/BC

[Mark Proctor]

I have isolated the issue and know what it is, and why it works one way 
and not the other. In short on unification if the variable is unbound we 
need to turn off indexing for that specific join attempt. We do this 
when it's left triggered, we don't do this when it's right triggered. 
Updated the code to also do this on right triggering. Should have it 
fixed tonight.

Thanks

Mark
On 25/06/2011 12:38, Mark Proctor wrote:
> ok thanks, I reproduced the problem with the following below. If you 
> change the String insertion order it works. I'll get this fixed over 
> the weekend:
>     @Test
>     public void testQueryWithObject() throws Exception {
>         String str = "" +
>             "package org.drools.test  \n" +
>
>             "import java.util.List\n" +
>             "import java.util.ArrayList\n" +
>
>             "global List list\n" +
>
>             "dialect \"mvel\"\n" +
>             "\n" +
>
>             "import 
> org.drools.integrationtests.BackwardChainingTest.Q\n" +
>             "import 
> org.drools.integrationtests.BackwardChainingTest.R\n" +
>             "import 
> org.drools.integrationtests.BackwardChainingTest.S\n" +
>
>             "query object(Object o)\n" +
>             "    o := Object() \n" +
>             "end\n" +
>
>             "rule collectObjects when\n" +
>             "   String( this == 'go1' )\n" +
>             "   object( o; )\n" +
>             "then\n" +
>             "   list.add( o );\n" +
>             "end\n" +
>
>
>             "rule init when\n" +
>             "   String( this == 'init' )\n" +
>             "then\n" +
>             " insert( new Q(1) );\n " +
>             " insert( new Q(5) );\n " +
>             " insert( new Q(6) );\n " +
>             " insert( new R(1) );\n " +
>             " insert( new R(4) );\n " +
>             " insert( new R(6) );\n " +
>             " insert( new R(2) );\n " +
>             " insert( new S(2) );\n " +
>             " insert( new S(3) );\n " +
>             " insert( new S(6) );\n " +
>             "end\n" +
>             "";
>
>         KnowledgeBuilder kbuilder = 
> KnowledgeBuilderFactory.newKnowledgeBuilder();
>         kbuilder.add( ResourceFactory.newByteArrayResource( 
> str.getBytes() ),
>                           ResourceType.DRL );
>
>         if ( kbuilder.hasErrors() ) {
>             fail( kbuilder.getErrors().toString() );
>         }
>
>         KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
>         kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );
>
>         kbase = SerializationHelper.serializeObject( kbase );
>
>         StatefulKnowledgeSession ksession = 
> kbase.newStatefulKnowledgeSession();
>         List<Integer> list = new ArrayList<Integer>();
>         ksession.setGlobal( "list", list );
>
>         ksession.insert( "go1" );
>         ksession.fireAllRules();
>
>         ksession.insert( "init" );
>         ksession.fireAllRules();
>
>         System.out.println( list );
>     }
>
> Mark
> On 25/06/2011 11:22, Wolfgang Laun wrote:
>> // This rule prints all objects in WM.
>> rule findObject
>> when
>>     $o: Object()
>> then
>>     System.out.println( "Object: " + $o );
>> end
>>
>> Happily I get
>>     Object: 42
>>     Object: a String object
>>     Object: org.drools.reteoo.InitialFactImpl at 4dde85f0
>>
>> Now the query way:
>>     query object( Object o )
>>         o := Object()
>>     end
>>     rule findObjectByQuery
>>     when
>>         object( $a ; )
>>     then
>>         System.out.println( "Object by query: " + $a );
>>     end
>>
>> Surprisingly, I get just one:
>>     Object by query: org.drools.reteoo.InitialFactImpl at 4dde85f0
>>
>> A marvellous effect can be observed when the condition in rule
>> findObjectByQuery is modified to
>>     when
>>         Object()
>>         object( $a ; )
>>     then
>> I'd have guessed that the above result would appear repeatedly, once 
>> for each Object in WM,
>> but that's not so. For N-1 facts the rule fires N*(N+1)/2 times, 
>> showing the "initial object"
>> N times, the first inserted object N-1 times, the second one N-2 
>> times and, finally, the last one
>> once.
>> Object by query: 42
>> Object by query: org.drools.reteoo.InitialFactImpl at 4dde85f0
>> Object by query: a String object
>> Object by query: 100
>> Object by query: 42
>> Object by query: org.drools.reteoo.InitialFactImpl at 4dde85f0
>> Object by query: a String object
>> Object by query: org.drools.reteoo.InitialFactImpl at 4dde85f0
>> Object by query: a String object
>> Object by query: org.drools.reteoo.InitialFactImpl at 4dde85f0
>>
>> -W
>>
>>
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>
>
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