Hello,

I am new to drools and trying to work with the knowledge agent for the automatic loading of rules into the knowledge base from a directory and then firing all the rules. Am using the ChangeSet xml File to configure the rule directory. Actually the problem is: the rules are fired for the first time only, but when I put a new rule file in the directory the new rules does't fire.

plz find the source code in the attachment

rgards,

nadeem

MY CODE:

public class KnowAgent {

KnowledgeBase buildKBA(KnowledgeBase kb){

KnowledgeAgent kagent = KnowledgeAgentFactory.newKnowledgeAgent( "MyAgent" );

kagent.applyChangeSet( ResourceFactory.newClassPathResource("resChangeSet.xml") );

ResourceFactory.getResourceChangeNotifierService().start();

ResourceFactory.getResourceChangeScannerService().start();

kb = kagent.getKnowledgeBase();

return kb;

}

--------------------------------------------------

public class RuleRunnerKnowledgeAgent {

private KnowAgent myKnowAgent = new KnowAgent();

private KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();

private KnowledgeRuntimeLogger logger;

private StatefulKnowledgeSession ksession;

public void RuleRunnerKnowledgeAgent(String[] rules,

Object[] facts) throws Exception {

kbase = myKnowAgent.buildKBA(kbase);

ksession = kbase.newStatefulKnowledgeSession();

logger = KnowledgeRuntimeLoggerFactory.newFileLogger(ksession, "agentkblog");

ksession.fireAllRules();

}

--------------------------------------------------

<?xml version="1.0" encoding="utf-8"?>

<change-set xmlns='http://drools.org/drools-5.0/change-set'

xmlns:xs='http://www.w3.org/2001/XMLSchema-instance'

xs:schemaLocation='http://drools.org/drools-5.0/change-set drools-change-set-5.0.xsd' >

<add>

</add>

</change-set>

--------------------------------------------------

rule "Rule 01"

when

eval (1==1)

then

System.out.println("Rule 01 Works");

end

2nd DRL file is also same like, but with diff rule and file name and output.

--------------------------------------------------

CONSOLE OUTPUT

[2009:11:329 00:11:762:info] ResourceChangeNotification created

[2009:11:329 00:11:764:info] ResourceChangeScanner created with default interval=60

[2009:11:329 00:11:765:debug] ResourceChangeNotification monitor added monitor=org.drools.io.impl.ResourceChangeScannerImpl@19134f4

[2009:11:329 00:11:766:info] KnowledgAgent created, with configuration:

monitorChangeSetEvents=true scanResources=true scanDirectories=true

[2009:11:329 00:11:766:info] KnowledegAgent has started listening for ChangeSet notifications

(null: 4, 101): schema_reference.4: Failed to read schema document 'drools-change-set-5.0.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.

(null: 4, 101): cvc-elt.1: Cannot find the declaration of element 'change-set'.

(null: 5, 9): schema_reference.4: Failed to read schema document 'drools-change-set-5.0.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.

(null: 7, 90): schema_reference.4: Failed to read schema document 'drools-change-set-5.0.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.

[2009:11:329 00:11:873:info] KnowledgAgent applying ChangeSet

[2009:11:329 00:11:875:debug] KnowledgeAgent subscribing to directory=[UrlResource path='file:src/main/rules/org/drools/prepare/collection/']

[2009:11:329 00:11:875:debug] ResourceChangeNotification subscribing listener=org.drools.agent.impl.KnowledgeAgentImpl@12d7a10 to resource=[UrlResource path='file:src/main/rules/org/drools/prepare/collection/']

[2009:11:329 00:11:875:debug] ResourceChangeScanner subcribing notifier=org.drools.io.impl.ResourceChangeNotifierImpl@1feca64 to resource=[UrlResource path='file:src/main/rules/org/drools/prepare/collection/']

[2009:11:329 00:11:877:debug] KnowledgeAgent subscribing to directory content resource=[FileResource file='src\main\rules\org\drools\prepare\collection\objectCollection1.drl']

[2009:11:329 00:11:877:debug] ResourceChangeNotification subscribing listener=org.drools.agent.impl.KnowledgeAgentImpl@12d7a10 to resource=[FileResource file='src\main\rules\org\drools\prepare\collection\objectCollection1.drl']

[2009:11:329 00:11:877:debug] ResourceChangeScanner subcribing notifier=org.drools.io.impl.ResourceChangeNotifierImpl@1feca64 to resource=[FileResource file='src\main\rules\org\drools\prepare\collection\objectCollection1.drl']

[2009:11:329 00:11:878:debug] KnowledgeAgent ChangeSet requires KnowledgeBuilder

[2009:11:329 00:11:878:debug] KnowledgeAgent rebuilding KnowledgeBase using ChangeSet

[2009:11:329 00:11:171:debug] KnowledgeAgent building resource=[FileResource file='src\main\rules\org\drools\prepare\collection\objectCollection1.drl']

[2009:11:329 00:11:601:info] KnowledgeAgent new KnowledgeBase now built and in use

[2009:11:329 00:11:603:info] ResourceChangeNotification has started listening for ChangeSet publications

[2009:11:329 00:11:603:debug] ResourceChangeNotification thread is waiting for queue update

[2009:11:329 00:11:604:info] ResourceChangeNotification scanner has started

[2009:11:329 00:11:605:debug] ResourceChangeScanner attempt to scan 2 resources

[2009:11:329 00:11:605:debug] ResourceChangeScanner scanning directory=[UrlResource path='file:src/main/rules/org/drools/prepare/collection/']

[2009:11:329 00:11:606:debug] ResourceChangeScanner thread is waiting for 60

Rule 01 Works

[2009:11:329 00:11:607:debug] ResourceChangeScanner attempt to scan 2 resources

[2009:11:329 00:11:608:debug] ResourceChangeScanner scanning directory=[UrlResource path='file:src/main/rules/org/drools/prepare/collection/']

[2009:11:329 00:11:609:debug] ResourceChangeScanner new resource=[FileResource file='src\main\rules\org\drools\prepare\collection\objectCollection1A.drl']

[2009:11:329 00:11:609:debug] ResourceChangeNotification subscribing directory=[UrlResource path='file:src/main/rules/org/drools/prepare/collection/'] content resource=[FileResource file='src\main\rules\org\drools\prepare\collection\objectCollection1A.drl']

[2009:11:329 00:11:609:debug] ResourceChangeNotification subscribing listener=org.drools.agent.impl.KnowledgeAgentImpl@12d7a10 to resource=[FileResource file='src\main\rules\org\drools\prepare\collection\objectCollection1A.drl']

[2009:11:329 00:11:610:debug] ResourceChangeScanner subcribing notifier=org.drools.io.impl.ResourceChangeNotifierImpl@1feca64 to resource=[FileResource file='src\main\rules\org\drools\prepare\collection\objectCollection1A.drl']

[2009:11:329 00:11:611:debug] ResourceChangeScanner modified resource=[FileResource file='src\main\rules\org\drools\prepare\collection\objectCollection1A.drl'] : -1 : 1259108256456

[2009:11:329 00:11:611:debug] ResourceChangeNotification received ChangeSet notification

[2009:11:329 00:11:612:debug] ResourceChangeScanner thread is waiting for 60

[2009:11:329 00:11:612:debug] ResourceChangeNotification processing ChangeSet

[2009:11:329 00:11:612:debug] ResourceChangeNotification ChangeSet added resource=[FileResource file='src\main\rules\org\drools\prepare\collection\objectCollection1A.drl'] for listener=org.drools.agent.impl.KnowledgeAgentImpl@12d7a10

[2009:11:329 00:11:613:debug] ResourceChangeNotification ChangeSet modified resource=[FileResource file='src\main\rules\org\drools\prepare\collection\objectCollection1A.drl'] for listener=org.drools.agent.impl.KnowledgeAgentImpl@12d7a10

[2009:11:329 00:11:613:debug] KnowledgeAgent received ChangeSet changed notification

[2009:11:329 00:11:613:debug] ResourceChangeNotification thread is waiting for queue update

[2009:11:329 00:11:613:info] KnowledgAgent applying ChangeSet

[2009:11:329 00:11:613:debug] KnowledgeAgent subscribing to resource=[FileResource file='src\main\rules\org\drools\prepare\collection\objectCollection1A.drl']

[2009:11:329 00:11:614:debug] ResourceChangeNotification subscribing listener=org.drools.agent.impl.KnowledgeAgentImpl@12d7a10 to resource=[FileResource file='src\main\rules\org\drools\prepare\collection\objectCollection1A.drl']

[2009:11:329 00:11:614:debug] KnowledgeAgent ChangeSet requires KnowledgeBuilder

[2009:11:329 00:11:614:debug] KnowledgeAgent rebuilding KnowledgeBase using ChangeSet

[2009:11:329 00:11:619:debug] KnowledgeAgent building resource=[FileResource file='src\main\rules\org\drools\prepare\collection\objectCollection1.drl']

[2009:11:329 00:11:749:debug] KnowledgeAgent building resource=[FileResource file='src\main\rules\org\drools\prepare\collection\objectCollection1A.drl']

[2009:11:329 00:11:840:info] KnowledgeAgent new KnowledgeBase now built and in use