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

        ksession.signalEvent("Message-HelloMessage", "NewValue");
        assertEquals(1, list.size());
    }
    
    public void testMessageEnd() throws Exception {
        KnowledgeBase kbase = createKnowledgeBase("BPMN2-MessageEndEvent.bpmn2");
    StatefulKnowledgeSession ksession = createKnowledgeSession(kbase);
        ksession.getWorkItemManager().registerWorkItemHandler("Send Task", new SendTaskHandler());
        Map<String, Object> params = new HashMap<String, Object>();
        params.put("x", "MyValue");
        ProcessInstance processInstance = ksession.startProcess("MessageEndEvent", params);

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        ProcessInstance processInstance = ksession.startProcess("MessageEndEvent", params);
        assertEquals(ProcessInstance.STATE_COMPLETED, processInstance.getState());
    }
    
    public void testMessageIntermediateThrow() throws Exception {
        KnowledgeBase kbase = createKnowledgeBase("BPMN2-IntermediateThrowEventMessage.bpmn2");
    StatefulKnowledgeSession ksession = createKnowledgeSession(kbase);
        ksession.getWorkItemManager().registerWorkItemHandler("Send Task", new SendTaskHandler());
        Map<String, Object> params = new HashMap<String, Object>();
        params.put("x", "MyValue");
        ProcessInstance processInstance = ksession.startProcess("MessageIntermediateEvent", params);

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        ProcessInstance processInstance = ksession.startProcess("MessageIntermediateEvent", params);
        assertEquals(ProcessInstance.STATE_COMPLETED, processInstance.getState());
    }
    
    public void testSignalIntermediateThrow() throws Exception {
        KnowledgeBase kbase = createKnowledgeBase("BPMN2-IntermediateThrowEventSignal.bpmn2");
    StatefulKnowledgeSession ksession = createKnowledgeSession(kbase);
        Map<String, Object> params = new HashMap<String, Object>();
        params.put("x", "MyValue");
        ProcessInstance processInstance = ksession.startProcess("SignalIntermediateEvent", params);
        assertEquals(ProcessInstance.STATE_COMPLETED, processInstance.getState());

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        ProcessInstance processInstance = ksession.startProcess("SignalIntermediateEvent", params);
        assertEquals(ProcessInstance.STATE_COMPLETED, processInstance.getState());
    }
    
    public void testNoneIntermediateThrow() throws Exception {
        KnowledgeBase kbase = createKnowledgeBase("BPMN2-IntermediateThrowEventNone.bpmn2");
    StatefulKnowledgeSession ksession = createKnowledgeSession(kbase);
        ProcessInstance processInstance = ksession.startProcess("NoneIntermediateEvent", null);
        assertEquals(ProcessInstance.STATE_COMPLETED, processInstance.getState());
    }

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      for (KnowledgeBuilderError error: kbuilder.getErrors()) {
        System.err.println(error);
      }
      throw new IllegalArgumentException("Errors while parsing knowledge base");
    }
    KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
    kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
    return kbase;
  }

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        // Set the system property so that automatic conversion can happen
        System.setProperty( "drools.ruleflow.port", "true" );


        kbuilder.add( ResourceFactory.newClassPathResource("ruleflow.drl", ExecutionFlowControlTest.class), ResourceType.DRL);
        kbuilder.add( ResourceFactory.newClassPathResource("ruleflow40.rfm", ExecutionFlowControlTest.class), ResourceType.DRF);
        KnowledgeBase kbase = kbuilder.newKnowledgeBase();
        final StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
        final List list = new ArrayList();
        ksession.setGlobal("list", list);
        ksession.fireAllRules();
        assertEquals(0, list.size());
        final ProcessInstance processInstance = ksession.startProcess("0");

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            "    <connection from=\"4\" to=\"5\" />\n" +
            "  </connections>\n" +
            "\n" +
            "</process>");
        kbuilder.add( ResourceFactory.newReaderResource( source ), ResourceType.DRF );
        KnowledgeBase kbase = kbuilder.newKnowledgeBase();
        StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
        // start process
        WorkflowProcessInstance processInstance = (WorkflowProcessInstance)
            ksession.startProcess("org.drools.state");
        // should be in state A
        assertEquals(ProcessInstance.STATE_ACTIVE, processInstance.getState());

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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_COMPLETED, processInstance.getState());
        assertEquals(1, list.size());

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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_COMPLETED, processInstance.getState());
        assertEquals(1, list.size());

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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_COMPLETED, processInstance.getState());
        assertEquals(1, list.size());

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