Examples of org.drools.KnowledgeBase

org.drools.KnowledgeBase
The KnowlegeBase is a repository of all the application's knowledge definitions. It will contain rules, processes, functions, type models. The KnowledgeBase itself does not contain data, instead sessions are created from the KnowledgeBase in which data can be inserted and process instances started. Creating the KnowlegeBase can be heavy, where as session creation is very light, so it is recommended that KnowleBase's be cached where possible to allow for repeated session creation. The KnowledgeAgent can be used for this purpose. The KnowledgeBase is created from the KnowledgeBaseFactory, and a KnowledgeBaseConfiguration can be used.
```
 KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase(); 
```
Create sequential KnowledgeBase using the given ClassLoader.
```
 Properties properties = new Properties(); properties.setProperty( "org.drools.sequential", "true"); KnowledgeBaseConfiguration kbConf = KnowledgeBaseFactory.newKnowledgeBaseConfiguration(properties, myClassLoader); KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase(kbConf); 
```
@see org.drools.KnowledgeBaseFactory

            "    <connection from=\"5\" to=\"6\" />\n" +
            "  </connections>\n" +
            "\n" +
            "</process>");
        kbuilder.add( ResourceFactory.newReaderResource( source ), ResourceType.DRF );
        KnowledgeBase kbase = kbuilder.newKnowledgeBase();
        StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
        List<String> list = new ArrayList<String>();
        ksession.setGlobal("list", list);
        ProcessInstance processInstance = ksession.startProcess("org.drools.state");
        assertEquals(ProcessInstance.STATE_ACTIVE, processInstance.getState());
        assertTrue(list.isEmpty());

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            "    <connection from=\"5\" to=\"6\" />\n" +
            "  </connections>\n" +
            "\n" +
            "</process>");
        kbuilder.add( ResourceFactory.newReaderResource( source ), ResourceType.DRF );
        KnowledgeBase kbase = kbuilder.newKnowledgeBase();
        StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
        List<String> list = new ArrayList<String>();
        ksession.setGlobal("list", list);
        ProcessInstance processInstance = ksession.startProcess("org.drools.state");
        assertEquals(ProcessInstance.STATE_ACTIVE, processInstance.getState());
        assertTrue(list.isEmpty());

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            "    <connection from=\"5\" to=\"6\" />\n" +
            "  </connections>\n" +
            "\n" +
            "</process>");
        kbuilder.add( ResourceFactory.newReaderResource( source ), ResourceType.DRF );
        KnowledgeBase kbase = kbuilder.newKnowledgeBase();
        StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
        List<String> list = new ArrayList<String>();
        ksession.setGlobal("list", list);
        ProcessInstance processInstance = ksession.startProcess("org.drools.state");
        assertEquals(ProcessInstance.STATE_ACTIVE, processInstance.getState());
        assertTrue(list.isEmpty());

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            "    <connection from=\"5\" to=\"6\" />\n" +
            "  </connections>\n" +
            "\n" +
            "</process>");
        kbuilder.add( ResourceFactory.newReaderResource( source ), ResourceType.DRF );
        KnowledgeBase kbase = kbuilder.newKnowledgeBase();
        StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
        List<String> list = new ArrayList<String>();
        ksession.setGlobal("list", list);
        ProcessInstance processInstance = ksession.startProcess("org.drools.state");
        assertEquals(ProcessInstance.STATE_ACTIVE, processInstance.getState());
        assertTrue(list.isEmpty());

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            "    <connection from=\"2\" to=\"3\" />\n" +
            "  </connections>\n" +
            "\n" +
            "</process>");
        kbuilder.add( ResourceFactory.newReaderResource( source ), ResourceType.DRF );
        KnowledgeBase kbase = kbuilder.newKnowledgeBase();
        StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
        List<String> list = new ArrayList<String>();
        ksession.setGlobal("list", list);
        // start process
        WorkflowProcessInstance processInstance = (WorkflowProcessInstance)
            ksession.startProcess("org.drools.state");

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            "    <connection from=\"2\" to=\"3\" />\n" +
            "  </connections>\n" +
            "\n" +
            "</process>");
        kbuilder.add( ResourceFactory.newReaderResource( source ), ResourceType.DRF );
        KnowledgeBase kbase = kbuilder.newKnowledgeBase();
        final StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
        List<String> list = new ArrayList<String>();
        ksession.setGlobal("list", list);
        new Thread(new Runnable() {
      public void run() {
        ksession.fireUntilHalt();

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            "    <connection from=\"2\" to=\"3\" />\n" +
            "  </connections>\n" +
            "\n" +
            "</process>");
        kbuilder.add( ResourceFactory.newReaderResource( source ), ResourceType.DRF );
        KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
        kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );        
        StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
      
        TestWorkItemHandler handler = new TestWorkItemHandler();
        ksession.getWorkItemManager().registerWorkItemHandler("Human Task", handler);
        Map<String, Object> parameters = new HashMap<String, Object>();
        parameters.put("UserName", "John Doe");

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            "\n" +
            "</process>");
        kbuilder.add( ResourceFactory.newReaderResource( source ), ResourceType.DRF );
        
        Collection<KnowledgePackage> kpkgs = kbuilder.getKnowledgePackages();
        KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
        kbase.addKnowledgePackages( kpkgs );        
        StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
      
        ImmediateTestWorkItemHandler handler = new ImmediateTestWorkItemHandler();
        ksession.getWorkItemManager().registerWorkItemHandler("Human Task", handler);
        ksession.getWorkItemManager().registerWorkItemHandler("Human Task", handler);
        Map<String, Object> parameters = new HashMap<String, Object>();

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            boolean success = true;
            final Thread[] t = new Thread[THREAD_COUNT];
            
            final KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
            kbuilder.add(ResourceFactory.newClassPathResource( "BPMN2-MultiThreadServiceProcess.bpmn" ), ResourceType.BPMN2 );
            KnowledgeBase kbase = kbuilder.newKnowledgeBase();
            StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
            ksession.getWorkItemManager().registerWorkItemHandler("Log", new WorkItemHandler() {
        public void executeWorkItem(WorkItem workItem, WorkItemManager manager) {
          Long threadId = (Long) workItem.getParameter("id");
//          System.out.println("Executing work item " + workItem.getId() + " for thread " + threadId);
          workItems.put(workItem.getId(), threadId);

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            boolean success = true;
            final Thread[] t = new Thread[THREAD_COUNT];
            
            final KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
            kbuilder.add(ResourceFactory.newClassPathResource( "BPMN2-MultiThreadServiceProcess.bpmn" ), ResourceType.BPMN2 );
            KnowledgeBase kbase = kbuilder.newKnowledgeBase();
            StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
            ksession.getWorkItemManager().registerWorkItemHandler("Log", new WorkItemHandler() {
        public void executeWorkItem(WorkItem workItem, WorkItemManager manager) {
          Long threadId = (Long) workItem.getParameter("id");
//          System.out.println("Executing process instance " + workItem.getProcessInstanceId() + " for thread " + threadId);
          workItems.put(workItem.getProcessInstanceId(), threadId);

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