3:52 a.m.
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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