[rules-users] Question to Knowledge-Agent Behaviour

[Davide Sottara]

The ResourceChangeScanner will consider a resource modified if last
modification > last read.
If your resource is a URL resource pointing to a file, the
implementation (version 5.6, at least)
will delegate to File.lastModified().
Make sure that whenever you (re)deploy your PKGs, the lastModified()
timestamp is updated

On 03/13/2014 12:47 PM, Peach Wyss wrote:
> Hy all
>
> We're having the following situation in our application:
>
> ChangeSet:
> <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
> http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-api/src/main/resources/change-set-1.0.0.xsd'>
>   <add>
>     <resource source='file:rules/rules.pkg' type='PKG' />
>   </add>
> </change-set>
>
>
> Code:
> ...
> // Build initial KnowledgeBase
> KnowledgeBuilderConfiguration kbuilderConfig =
> KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration(null,
> classloaders);
> knowledgeBuilder =
> KnowledgeBuilderFactory.newKnowledgeBuilder(kbuilderConfig);
> knowledgeBuilder.add(resource, resourceType); //Resource: URL-Resource
> (Patch to ChangeSet), ResourceType: ChangeSet
> Collection<KnowledgePackage> knowledgePackages =
> knowledgeBuilder.getKnowledgePackages();
> knowledgeBase.addKnowledgePackages(knowledgePackages);
>
> // Create and configure Knowledge Agent
> KnowledgeAgentConfiguration knowledgeAgentConfig =
> KnowledgeAgentFactory.newKnowledgeAgentConfiguration();
> knowledgeAgentConfig.setProperty("drools.agent.useKBaseClassLoaderForCompiling",
> "true");
> knowledgeAgentConfig.setProperty("drools.agent.newInstance", "false");
> knowledgeAgent = KnowledgeAgentFactory.newKnowledgeAgent("MyAgent",
> knowledgeBase, knowledgeAgentConfig);
> knowledgeAgent.addEventListener(new KnowledgeAgentEventListener()
> {...} // Just for debugging purposes
> knowledgeAgent.monitorResourceChangeEvents(true);
> knowledgeAgent.applyChangeSet(resource);
>
> // Configure Notification and Scanner
> ResourceChangeScannerConfiguration resourceChangeScannerConfig =
> ResourceFactory
>          
> .getResourceChangeScannerService().newResourceChangeScannerConfiguration();
> resourceChangeScannerConfig.setProperty("drools.resource.scanner.interval",
> "10");
> ResourceFactory.getResourceChangeScannerService().configure(resourceChangeScannerConfig);
> ResourceFactory.getResourceChangeNotifierService().start();
> ResourceFactory.getResourceChangeScannerService().start();
>
> // Get KnowledgeBase from Agent
> knowledgeBase = knowledgeAgent.getKnowledgeBase();
> ...
>
>
> When i replace the rules.pkg with a new package (exported from guvnor
> with a newer "Date Modified"), the Knowledge-Base is newly generated.
> When I replace the pkg with the Package from the previous Version
> (older "Date modified"), nothing happens (despite the pkg has changed).
>
> Question:
> Does the agent only updates the Knowledge-Base, when the replaced
> pkg-File has a newer "Date Modified"?
> In our scenario, the expected behaviour would be that the Agent
> updates the Knowledge-Base everytime the pkg-file changes, so that we
> can switch between newer and older versions of the pkg-file. Any idea
> how to achieve this?
>
> Thanks for your help.
>
> Kind regards,
> Peter
>
>
> _______________________________________________
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> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users

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