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Using KnowledgeAgentEventListener to detect new processes (v5.4.0)
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created by <a href="https://community.jboss.org/people/cold_gin">cold gin</a> in <i>jBPM</i> - <a href="https://community.jboss.org/message/820162#820162">View the full discussion</a>
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<div class="jive-rendered-content"><p>I am trying to implement a KnowledgeAgentEventListener so that I can detect *newly added* processes, and I would also like to be able to detect the creation of new packages somehow. So far, I have created a KnowledgeAgent, added a KnowledgeAgentEventListener, but all that comes back on the beforeResourceAdded() and afterResourceAdded() event handlers are RESOURCE_DELETED statuses. When I print out the event source object type, it's ChangeSetImpl, which I guess makes sense since I am adding the change set as the resource type to the knowledge agent, and I guess that the change set is being replaced, so I get the RESOURCE_DELETED status. But I am trying to figure out how to configure the knowledge agent so that I can receive more fine-grained change events such as PROCESS_ADDED and PROCESS_UPDATED statuses (if such jbpm statuses exist).</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Here is the relevant code so far:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java">KnowledgeAgentConfiguration agentConfig = KnowledgeAgentFactory.newKnowledgeAgentConfiguration();
<font color="darkgreen">// Tells jBPM to update existing knowledge base and not to create a new one each time: </font>
agentConfig.setProperty(<font color="red">"drools.agent.newInstance"</font>, <font color="red">"false"</font>);
<font color="darkgreen">// Tells jBPM what to scan: </font>
agentConfig.setProperty(<font color="red">"drools.agent.monitorChangeSetEvents"</font>, <font color="red">"true"</font>);       
agentConfig.setProperty(<font color="red">"drools.agent.scanDirectories"</font>, <font color="red">"true"</font>);
agentConfig.setProperty(<font color="red">"drools.agent.scanResources"</font>, <font color="red">"true"</font>);
       
KnowledgeAgent knowledgeAgent = KnowledgeAgentFactory.newKnowledgeAgent(knowledgeAgentName,agentConfig);
 
org.drools.io.Resource changeSetResource = createChangeSetResouceUsing(changeSetXmlAsString);
           
knowledgeAgent.applyChangeSet(changeSetResource);
 
ResourceFactory.getResourceChangeNotifierService().start();
ResourceFactory.getResourceChangeScannerService().start();
 
 
            knowledgeAgent.addEventListener(<font color="navy"><b>new</b></font> KnowledgeAgentEventListener() <font color="navy">{</font>
 
                @Override
                <font color="navy"><b>public</b></font> <font color="navy"><b>void</b></font> beforeChangeSetApplied(BeforeChangeSetAppliedEvent event) <font color="navy">{</font>
                    logger.debug(<font color="red">"beforeChangeSetApplied() event handler called"</font>);                   
                <font color="navy">}</font>
 
                @Override
                <font color="navy"><b>public</b></font> <font color="navy"><b>void</b></font> afterChangeSetApplied(AfterChangeSetAppliedEvent eve nt) <font color="navy">{</font>
                    logger.debug(<font color="red">"afterChangeSetApplied() event handler called"</font>);                   
                <font color="navy">}</font>
 
                @Override
                <font color="navy"><b>public</b></font> <font color="navy"><b>void</b></font> beforeChangeSetProcessed(BeforeChangeSetProcessedEvent event) <font color="navy">{</font>
                    logger.debug(<font color="red">"beforeChangeSetProcessed() event handler called"</font>);   
                <font color="navy">}</font>
 
                @Override
                <font color="navy"><b>public</b></font> <font color="navy"><b>void</b></font> afterChangeSetProcessed(AfterChangeSetProcessedEvent event) <font color="navy">{</font>
                    logger.debug(<font color="red">"afterChangeSetProcessed() event handler called"</font>);
                <font color="navy">}</font>
 
                @Override
                <font color="navy"><b>public</b></font> <font color="navy"><b>void</b></font> beforeResourceProcessed(BeforeResourceProcessedEvent event) <font color="navy">{</font>
                    logger.debug(<font color="red">"======================================================="</font>);
                    logger.debug(<font color="red">"beforeResourceProcessed() event handler called"</font>);
                    logger.debug(<font color="red">"beforeResourceProcessed() - event.getResource(): "</font> + event.getResource().toString());
                    logger.debug(<font color="red">"beforeResourceProcessed() - event.getResourceType(): [ "</font> + event.getResourceType().getName() + <font color="red">", "</font> + event.getResourceType().getDescription() + <font color="red">" ]"</font>);
                    logger.debug(<font color="red">"beforeResourceProcessed() - event.getStatus().name(): "</font> + event.getStatus().name());
                    logger.debug(<font color="red">"beforeResourceProcessed() - event.getStatus(): "</font> + event.getStatus());
                    logger.debug(<font color="red">"beforeResourceProcessed() - event.getSource().getClass().getCanonicalName(): "</font> + event.getSource().getClass().getCanonicalName());
                    logger.debug(<font color="red">"======================================================="</font>);
                <font color="navy">}</font>
 
                @Override
                <font color="navy"><b>public</b></font> <font color="navy"><b>void</b></font> afterResourceProcessed(AfterResourceProcessedEvent event) <font color="navy">{</font>
                    logger.debug(<font color="red">"======================================================="</font>);
                    logger.debug(<font color="red">"afterResourceProcessed() event handler called"</font>);
                    logger.debug(<font color="red">"afterResourceProcessed() - event.getResource(): "</font> + event.getResource().toString());
                    logger.debug(<font color="red">"afterResourceProcessed() - event.getResourceType(): [ "</font> + event.getResourceType().getName() + <font color="red">", "</font> + event.getResourceType().getDescription() + <font color="red">" ]"</font>);
                    logger.debug(<font color="red">"afterResourceProcessed() - event.getStatus().name(): "</font> + event.getStatus().name());
                    logger.debug(<font color="red">"afterResourceProcessed() - event.getStatus(): "</font> + event.getStatus());
                    logger.debug(<font color="red">"afterResourceProcessed() - event.getSource().getClass().getCanonicalName(): "</font> + event.getSource().getClass().getCanonicalName());
                    logger.debug(<font color="red">"======================================================="</font>);
                <font color="navy">}</font>
 
                @Override
                <font color="navy"><b>public</b></font> <font color="navy"><b>void</b></font> knowledgeBaseUpdated(KnowledgeBaseUpdatedEvent event) <font color="navy">{</font>
                    logger.debug(<font color="red">"knowledgeBaseUpdated() event handler called"</font>);
                    logger.debug(<font color="red">"knowledgeBaseUpdated(): Logging kbase process names after update..."</font>);
                   
                    <font color="navy"><b>for</b></font>(org.drools.definition.process.Process process:event.getKnowledgeBase().getProcesses())
                    <font color="navy">{</font>
                        logger.debug(<font color="red">"knowledgeBaseUpdated(): process name == "</font> + process.getName());
                    <font color="navy">}</font>
                <font color="navy">}</font>
 
                @Override
                <font color="navy"><b>public</b></font> <font color="navy"><b>void</b></font> resourceCompilationFailed(ResourceCompilationFailedEvent event) <font color="navy">{</font>
                    logger.debug(<font color="red">"resourceCompilationFailed() event handler called"</font>);
                   
                <font color="navy">}</font>
               
            <font color="navy">}</font>);
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Questions:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>1.) Is it possible to configure the knowledge agent in such a way that I could receive specific "PROCESS_ADDED / PROCESS_UPDATED" events when a process is added/updated in a package?</p><p>    (currently I only see the new process logged in the code above inside of the knowledgeBaseUpdated() handler, but I am not receiving a specific event as to *what caused* the knowledge base to be updated</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>2.) I have seen a few references warning that the change notifier and change scanner services must be stopped or a memory leak can occur, but where would you stop them? The</p><p>    knowledge base needs to "live on" and be updated as new knowledge sessions are created from it. So the only place I would be stopping these services and disposing of the</p><p>    knowledge agent, would be when the server is rebooted. Is this incorrect? If so, *when* would be an appropriate time to stop these services?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>3.) Is it possible to detect newly created packages using KnowledgeAgentEventListener? If not, is there some other listener that can be implemented to detect new packages?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Just as some additional info, the change set resource is created with change set xml that specifies resource type = PKG for all of the packages that I want to be monitored for adds/updates (inside of 'add' xml tags), and then:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>private org.drools.io.Resource createChangeSetResouceUsing(String changeSetXmlAsString) {</p><p>org.drools.io.Resource changeSetResource = new ByteArrayResource(changeSetXmlAsString.getBytes());</p><p>((InternalResource) changeSetResource).setResourceType(ResourceType.CHANGE_SET);</p><p>return changeSetResource;</p><p>}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thanks in advance for any insights.</p><pre class="jive-pre"><code class="jive-code jive-java"></code></pre></div>
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