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

      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());
    StatefulKnowledgeSession ksession = createKnowledgeSession(kbase);
    Map<String, Object> params = new HashMap<String, Object>();
    params.put("x", "oldValue");
    ProcessInstance processInstance = ksession.startProcess("ParentProcess", params);
    assertTrue(processInstance.getState() == ProcessInstance.STATE_COMPLETED);

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    assertTrue(processInstance.getState() == ProcessInstance.STATE_COMPLETED);
    assertEquals("new value", ((WorkflowProcessInstance) processInstance).getVariable("y"));
  }


  public void testSubProcess() throws Exception {
    KnowledgeBase kbase = createKnowledgeBase("BPMN2-SubProcess.bpmn2");
    StatefulKnowledgeSession ksession = createKnowledgeSession(kbase);
    ProcessInstance processInstance = ksession.startProcess("SubProcess");
    assertTrue(processInstance.getState() == ProcessInstance.STATE_COMPLETED);
  }

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    ProcessInstance processInstance = ksession.startProcess("SubProcess");
    assertTrue(processInstance.getState() == ProcessInstance.STATE_COMPLETED);
  }


  public void testMultiInstanceLoopCharacteristicsProcess() throws Exception {
    KnowledgeBase kbase = createKnowledgeBase("BPMN2-MultiInstanceLoopCharacteristicsProcess.bpmn2");
    StatefulKnowledgeSession ksession = createKnowledgeSession(kbase);
    Map<String, Object> params = new HashMap<String, Object>();
    List<String> myList = new ArrayList<String>();
    myList.add("First Item");
    myList.add("Second Item");

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    ProcessInstance processInstance = ksession.startProcess("MultiInstanceLoopCharacteristicsProcess", params);
    assertTrue(processInstance.getState() == ProcessInstance.STATE_COMPLETED);
  }


    public void testEscalationBoundaryEvent() throws Exception {
        KnowledgeBase kbase = createKnowledgeBase("BPMN2-EscalationBoundaryEvent.bpmn2");
    StatefulKnowledgeSession ksession = createKnowledgeSession(kbase);
        ProcessInstance processInstance = ksession.startProcess("EscalationBoundaryEvent");
        assertTrue(processInstance.getState() == ProcessInstance.STATE_COMPLETED);
    }

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        ProcessInstance processInstance = ksession.startProcess("EscalationBoundaryEvent");
        assertTrue(processInstance.getState() == ProcessInstance.STATE_COMPLETED);
    }


    public void testEscalationBoundaryEventInterrupting() throws Exception {
        KnowledgeBase kbase = createKnowledgeBase("BPMN2-EscalationBoundaryEventInterrupting.bpmn2");
    StatefulKnowledgeSession ksession = createKnowledgeSession(kbase);
        ksession.getWorkItemManager().registerWorkItemHandler("MyTask", new DoNothingWorkItemHandler());
        ProcessInstance processInstance = ksession.startProcess("EscalationBoundaryEvent");
        assertTrue(processInstance.getState() == ProcessInstance.STATE_COMPLETED);
        // TODO: check for cancellation of task

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        assertTrue(processInstance.getState() == ProcessInstance.STATE_COMPLETED);
        // TODO: check for cancellation of task
    }


    public void testErrorBoundaryEvent() throws Exception {
        KnowledgeBase kbase = createKnowledgeBase("BPMN2-ErrorBoundaryEventInterrupting.bpmn2");
    StatefulKnowledgeSession ksession = createKnowledgeSession(kbase);
        ksession.getWorkItemManager().registerWorkItemHandler("MyTask", new DoNothingWorkItemHandler());
        ProcessInstance processInstance = ksession.startProcess("ErrorBoundaryEvent");
    assertProcessInstanceCompleted(processInstance.getId(), ksession);
    }

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//        ksession.getWorkItemManager().completeWorkItem(workItem.getId(), null);
//    assertProcessInstanceCompleted(processInstance.getId(), ksession);
//    }
    
    public void testIntermediateCatchEventSignal() throws Exception {
    KnowledgeBase kbase = createKnowledgeBase("BPMN2-IntermediateCatchEventSignal.bpmn2");
    StatefulKnowledgeSession ksession = createKnowledgeSession(kbase);
    ksession.getWorkItemManager().registerWorkItemHandler("Human Task", new DoNothingWorkItemHandler());
    ProcessInstance processInstance = ksession.startProcess("IntermediateCatchEvent");
    assertTrue(processInstance.getState() == ProcessInstance.STATE_ACTIVE);
    ksession = restoreSession(ksession, true);

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    ksession.signalEvent("MyMessage", "SomeValue", processInstance.getId());
    assertProcessInstanceCompleted(processInstance.getId(), ksession);
  }


    public void testIntermediateCatchEventMessage() throws Exception {
        KnowledgeBase kbase = createKnowledgeBase("BPMN2-IntermediateCatchEventMessage.bpmn2");
    StatefulKnowledgeSession ksession = createKnowledgeSession(kbase);
        ksession.getWorkItemManager().registerWorkItemHandler("Human Task", new DoNothingWorkItemHandler());
        ProcessInstance processInstance = ksession.startProcess("IntermediateCatchEvent");
        assertTrue(processInstance.getState() == ProcessInstance.STATE_ACTIVE);
        ksession = restoreSession(ksession, true);

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        ksession.signalEvent("Message-HelloMessage", "SomeValue", processInstance.getId());
    assertProcessInstanceCompleted(processInstance.getId(), ksession);
    }


    public void testIntermediateCatchEventTimer() throws Exception {
        KnowledgeBase kbase = createKnowledgeBase("BPMN2-IntermediateCatchEventTimerDuration.bpmn2");
    StatefulKnowledgeSession ksession = createKnowledgeSession(kbase);
        ksession.getWorkItemManager().registerWorkItemHandler("Human Task", new DoNothingWorkItemHandler());
        ProcessInstance processInstance = ksession.startProcess("IntermediateCatchEvent");
        assertTrue(processInstance.getState() == ProcessInstance.STATE_ACTIVE);
        // now wait for 1 second for timer to trigger

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//        ksession.insert(person);
//    assertProcessInstanceCompleted(processInstance.getId(), ksession);
//    }


    public void testErrorEndEventProcess() throws Exception {
        KnowledgeBase kbase = createKnowledgeBase("BPMN2-ErrorEndEvent.bpmn2");
    StatefulKnowledgeSession ksession = createKnowledgeSession(kbase);
        ProcessInstance processInstance = ksession.startProcess("ErrorEndEvent");
    assertProcessInstanceAborted(processInstance.getId(), ksession);
    }

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