[rules-users] KnowledgeAgent to update knowledge base built with Guvnor pkg

[Davide Sottara]

Thanks, I'll try to reproduce it later. Just a couple of side notes..

Given that the rules fire correctly the first time, I would exclude that the
wrong URL is used. The ChangeScanner has a polling interval of **60**
seconds, so
changes may not be immediate. You can configure that interval, though.

In the logs, then, you should see something like :

"ResourceChangeScanner attempt to scan x resources"
(it's a DEBUG level message, you may want to configure log4j accordingly)

x obviously should be greater than 0.
You should then see a message saying that the ResourceChangeScanner
modified/removed/added some resources. If not, it's not picking up the
change..
I'd try forcing a PKG rebuild manually after changing the rules in guvnor.

The changeset.xsd error is just a warning, it won't affect execution.




On 05/02/2013 01:52 AM, riri wrote:
> Here is the code I am using to create the knowledge base, knowledge agent and
> to retrieve the resources:
>
> public static KnowledgeBase createKnowledgeBase(List<DroolsResource>
> resources, 
> 			 EventProcessingOption eventProcessingOption)
> 	{
> 		KnowledgeBuilder builder = KnowledgeBuilderFactory.newKnowledgeBuilder();
> 		
> 		for (DroolsResource resource : resources) 
> 		{
> 			logger.info("Resource: " + resource.getType() + ", path type="
> 	                + resource.getPathType() + ", path=" + resource.getPath());
> 	        switch (resource.getPathType()) 
> 	        {
> 		        case CLASSPATH:
> 		           
> builder.add(ResourceFactory.newClassPathResource(resource.getPath()),
> 		            		resource.getType());
> 		            break;
> 		        case FILE:
> 		           
> builder.add(ResourceFactory.newFileResource(resource.getPath()),
> 		            		resource.getType());
> 		            break;
> 		        case URL:
> 		            UrlResource urlResource = (UrlResource) ResourceFactory
> 		                    .newUrlResource(resource.getPath());
> 		            
> 		            if (resource.getUsername() != null) 
> 		            {
> 		                logger.info("Setting authentication for: " +
> resource.getUsername());
> 		                urlResource.setBasicAuthentication("enabled");
> 		                urlResource.setUsername(resource.getUsername());
> 		                urlResource.setPassword(resource.getPassword());
> 		            }
> 		            
> 		            builder.add(urlResource, resource.getType());
> 		            break;
> 		        default:
> 		        	throw new IllegalArgumentException(
> 	                    "Unable to build this resource path type.");
> 	        }
>         }
> 		
> 		if (builder.hasErrors()) {
>             throw new RuntimeException(builder.getErrors().toString());
>         }
>
>         KnowledgeBaseConfiguration conf =
> KnowledgeBaseFactory.newKnowledgeBaseConfiguration();
>        // setting the STREAM option
>         conf.setOption(eventProcessingOption);
>         // modify the default identity compare mode to equality
>         conf.setOption(AssertBehaviorOption.EQUALITY);
>         
>         KnowledgeBase knowledgeBase =
> KnowledgeBaseFactory.newKnowledgeBase(conf);
>         knowledgeBase.addKnowledgePackages(builder.getKnowledgePackages());
>
>         return knowledgeBase;
> 		
> 	}
>
>     public static KnowledgeAgent createKnowledgeAgent(String
> knowledgeAgentName, KnowledgeBase knowledgeBase)
> 	{
> 		KnowledgeAgentConfiguration aconf =
> KnowledgeAgentFactory.newKnowledgeAgentConfiguration();
>
> 		aconf.setProperty("drools.agent.newInstance", "false"); 
> 		KnowledgeAgent kagent =
> KnowledgeAgentFactory.newKnowledgeAgent(knowledgeAgentName, knowledgeBase,
> aconf);
> 		
> 		ResourceFactory.getResourceChangeScannerService().start();
> 		ResourceFactory.getResourceChangeNotifierService().start();
>
> 		return kagent;
> 	}
>
>     public DroolsResource getGuvnorResource(User user)
> 	{
> 		String packageName = user.getUsername();
> 		String guvnorBinaryResourceUrl =
> "http://127.0.0.1:8080/guvnor/rest/packages/" + packageName + "/binary";
> 		return new DroolsResource(guvnorBinaryResourceUrl, ResourcePathType.URL,
> ResourceType.PKG, credentials.getUserPrincipal().getName(),
> credentials.getPassword());	
> 	}
>
> Where the DroolsResource is a custom class to hold information about a
> resource:
>
> public class DroolsResource
> {
>
> 	private String path;
> 	private ResourcePathType pathType;
> 	private ResourceType type;
> 	private String username = null;
> 	private String password = null;
>
>      //getters, setters and constructors
> }
>
> To initialize the environement I just call the method to create the
> knowledge base once I have the DroolsResource and then the method to create
> the knowledge agent. Afterwards I create a statefull knowledge session using
> the getKnowledgeBase() of the agent. Would the problem be the Guvnor url
> that I am using? I used the rest version since it sais that it builds the
> package automatically. Or the fact that the url is not in a change-set.xml
> file? 
>
> When I run the session the first time (via the fireUntilHalt() in a separate
> thread), rules get executed correctly and I call the halt() method to stop
> it. If I then go and change a rule in the package and restart the session
> then no changes are taken into account. Is the way I am executing the
> sessions a problem? I do not want to recreate a new session every time since
> I would have to reinsert all the facts, so I retrieve the session from the
> knowledge base. I dispose of the session when the application is shut down.
> I am new at this so I might be overlooking an important aspect.
>
> Many thanks for all your help.
>
>
>
>
> --
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