Examples of org.drools.runtime.process.WorkItem

org.drools.runtime.process.WorkItem
Represents one unit of work that needs to be executed. It contains all the information that it necessary to execute this unit of work as parameters, and (possibly) results related to its execution. WorkItems represent a unit of work in an abstract, high-level and implementation-independent manner. They are created by the engine whenever an external task needs to be performed. The engine will delegate the work item to the appropriate WorkItemHandler for execution. Whenever a work item is completed (or whenever the work item cannot be executed and should be aborted), the work item manager should be notified. For example, a work item could be created whenever an email needs to be sent. This work item would have a name that represents the type of work that needs to be executed (e.g. "Email") and parameters related to its execution (e.g. "From" = "me@mail.com", "To" = ..., "Body" = ..., ...). Result parameters can contain results related to the execution of this work item (e.g. "Success" = true). @see org.drools.runtime.process.WorkItemHandler @see org.drools.runtime.process.WorkItemManager

        Map<String, Object> parameters = new HashMap<String, Object>();
        parameters.put("name", "John Doe");
        ProcessInstance processInstance = ksession.startProcess( "org.drools.test.TestProcess", parameters );


        TestWorkItemHandler handler = TestWorkItemHandler.getInstance();
        WorkItem workItem = handler.getWorkItem();
        assertNotNull( workItem );
        assertEquals( "John Doe", workItem.getParameter("name"));


        ksession = JPAKnowledgeService.loadStatefulKnowledgeSession( id, kbase, null, env );
        processInstance = ksession.getProcessInstance( processInstance.getId() );
        assertNotNull( processInstance );


        ksession = JPAKnowledgeService.loadStatefulKnowledgeSession( id, kbase, null, env );
        ksession.getWorkItemManager().completeWorkItem( workItem.getId(), null );


        workItem = handler.getWorkItem();
        assertNotNull( workItem );
        assertEquals( "John Doe", workItem.getParameter("text"));
        
        ksession = JPAKnowledgeService.loadStatefulKnowledgeSession( id, kbase, null, env );
        processInstance = ksession.getProcessInstance( processInstance.getId() );
        assertNotNull( processInstance );


        ksession = JPAKnowledgeService.loadStatefulKnowledgeSession( id, kbase, null, env );
        ksession.getWorkItemManager().completeWorkItem( workItem.getId(), null );


        workItem = handler.getWorkItem();
        assertNull( workItem );


        ksession = JPAKnowledgeService.loadStatefulKnowledgeSession( id, kbase, null, env );

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        parameters.put("f", myEntityOnlyFields);
        parameters.put("z", myVariableSerializable);
        long processInstanceId = ksession.startProcess( "com.sample.ruleflow", parameters ).getId();


        TestWorkItemHandler handler = TestWorkItemHandler.getInstance();
        WorkItem workItem = handler.getWorkItem();
        assertNotNull( workItem );
        
        List<?> result = emf.createEntityManager().createQuery("select i from MyEntity i").getResultList();
        assertEquals(1, result.size());
        result = emf.createEntityManager().createQuery("select i from MyEntityMethods i").getResultList();
        assertEquals(1, result.size());
        result = emf.createEntityManager().createQuery("select i from MyEntityOnlyFields i").getResultList();
        assertEquals(1, result.size());


        logger.info("### Retrieving process instance ###");
        ksession = reloadSession( ksession, kbase, env );
        WorkflowProcessInstance processInstance = (WorkflowProcessInstance) 
          ksession.getProcessInstance( processInstanceId );
        assertNotNull( processInstance );
        assertEquals("SomeString", processInstance.getVariable("x"));
        assertEquals("This is a test Entity with annotation in fields", ((MyEntity) processInstance.getVariable("y")).getTest());
        assertEquals("This is a test Entity with annotations in methods", ((MyEntityMethods) processInstance.getVariable("m")).getTest());
        assertEquals("This is a test Entity with annotations in fields and without accesors methods", ((MyEntityOnlyFields) processInstance.getVariable("f")).test);
        assertEquals("This is a test SerializableObject", ((MyVariableSerializable) processInstance.getVariable("z")).getText());
        assertNull(processInstance.getVariable("a"));
        assertNull(processInstance.getVariable("b"));
        assertNull(processInstance.getVariable("c"));
        logger.info("### Completing first work item ###");
        ksession.getWorkItemManager().completeWorkItem( workItem.getId(), null );


        workItem = handler.getWorkItem();
        assertNotNull( workItem );
        


        
        logger.info("### Retrieving process instance ###");
        ksession = reloadSession( ksession, kbase , env );
    processInstance = (WorkflowProcessInstance)
      ksession.getProcessInstance(processInstanceId);
    assertNotNull(processInstance);
        assertEquals("SomeString", processInstance.getVariable("x"));
        assertEquals("This is a test Entity with annotation in fields", ((MyEntity) processInstance.getVariable("y")).getTest());
        assertEquals("This is a test Entity with annotations in methods", ((MyEntityMethods) processInstance.getVariable("m")).getTest());
        assertEquals("This is a test Entity with annotations in fields and without accesors methods", ((MyEntityOnlyFields) processInstance.getVariable("f")).test);
        assertEquals("This is a test SerializableObject", ((MyVariableSerializable) processInstance.getVariable("z")).getText());
        assertEquals("Some new String", processInstance.getVariable("a"));
        assertEquals("This is a new test Entity", ((MyEntity) processInstance.getVariable("b")).getTest());
        assertEquals("This is a new test SerializableObject", ((MyVariableSerializable) processInstance.getVariable("c")).getText());
        logger.info("### Completing second work item ###");
    ksession.getWorkItemManager().completeWorkItem(workItem.getId(), null);


        workItem = handler.getWorkItem();
        assertNotNull(workItem);
        


        logger.info("### Retrieving process instance ###");
        ksession = reloadSession( ksession, kbase, env);
        processInstance = (WorkflowProcessInstance)
          ksession.getProcessInstance(processInstanceId);
        assertNotNull(processInstance);
        assertEquals("SomeString", processInstance.getVariable("x"));
        assertEquals("This is a test Entity with annotation in fields", ((MyEntity) processInstance.getVariable("y")).getTest());
        assertEquals("This is a test Entity with annotations in methods", ((MyEntityMethods) processInstance.getVariable("m")).getTest());
        assertEquals("This is a test Entity with annotations in fields and without accesors methods", ((MyEntityOnlyFields) processInstance.getVariable("f")).test);
        assertEquals("This is a test SerializableObject", ((MyVariableSerializable) processInstance.getVariable("z")).getText());
        assertEquals("Some changed String", processInstance.getVariable("a"));
        assertEquals("This is a changed test Entity", ((MyEntity) processInstance.getVariable("b")).getTest());
        assertEquals("This is a changed test SerializableObject", ((MyVariableSerializable) processInstance.getVariable("c")).getText());
        logger.info("### Completing third work item ###");
        ksession.getWorkItemManager().completeWorkItem(workItem.getId(), null);


        workItem = handler.getWorkItem();
        assertNull(workItem);

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        parameters.put("f", myEntityOnlyFields);
        parameters.put("z", myVariableSerializable);
        long processInstanceId = ksession.startProcess( "com.sample.ruleflow", parameters ).getId();


        TestWorkItemHandler handler = TestWorkItemHandler.getInstance();
        WorkItem workItem = handler.getWorkItem();
        assertNotNull( workItem );


        ksession = reloadSession( ksession, kbase, env );
        ProcessInstance processInstance = ksession.getProcessInstance( processInstanceId );
        assertNotNull( processInstance );
        ksession.getWorkItemManager().completeWorkItem( workItem.getId(), null );


        workItem = handler.getWorkItem();
        assertNotNull( workItem );


        ksession = reloadSession( ksession, kbase, env );
        processInstance = ksession.getProcessInstance( processInstanceId );
        assertNotNull( processInstance );
        ksession.getWorkItemManager().completeWorkItem( workItem.getId(), null );


        workItem = handler.getWorkItem();
        assertNull( workItem );


        ksession = reloadSession( ksession, kbase, env );

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        parameters.put("f", myEntityOnlyFields);
        parameters.put("z", myVariableSerializable);
        long processInstanceId = ksession.startProcess( "com.sample.ruleflow", parameters ).getId();


        TestWorkItemHandler handler = TestWorkItemHandler.getInstance();
        WorkItem workItem = handler.getWorkItem();
        assertNotNull( workItem );


        ksession = reloadSession( ksession, kbase, env );
        ProcessInstance processInstance = ksession.getProcessInstance( processInstanceId );
        assertNotNull( processInstance );
        ksession.getWorkItemManager().completeWorkItem( workItem.getId(), null );


        workItem = handler.getWorkItem();
        assertNotNull( workItem );


        ksession = reloadSession( ksession, kbase, env );
        processInstance = ksession.getProcessInstance( processInstanceId );
        assertNotNull( processInstance );
        ksession.getWorkItemManager().completeWorkItem( workItem.getId(), null );


        workItem = handler.getWorkItem();
        assertNotNull( workItem );


        ksession = reloadSession( ksession, kbase, env );
        processInstance = ksession.getProcessInstance( processInstanceId );
        assertNotNull( processInstance );
        ksession.getWorkItemManager().completeWorkItem( workItem.getId(), null );


        workItem = handler.getWorkItem();
        assertNull( workItem );


        ksession = reloadSession( ksession, kbase, env );

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        parameters.put("y", myEntity);
        parameters.put("z", myVariableSerializable);
        long processInstanceId = ksession.startProcess( "com.sample.ruleflow", parameters ).getId();


        TestWorkItemHandler handler = TestWorkItemHandler.getInstance();
        WorkItem workItem = handler.getWorkItem();
        assertNotNull( workItem );


        logger.info("### Retrieving process instance ###");
        ksession = reloadSession( ksession, kbase , env);
        WorkflowProcessInstance processInstance = (WorkflowProcessInstance)
          ksession.getProcessInstance( processInstanceId );
        assertNotNull( processInstance );
        assertEquals("SomeString", processInstance.getVariable("x"));
        assertEquals("This is a test Entity", ((MyEntity) processInstance.getVariable("y")).getTest());
        assertEquals("This is a test SerializableObject", ((MyVariableSerializable) processInstance.getVariable("z")).getText());
        assertNull(processInstance.getVariable("a"));
        assertNull(processInstance.getVariable("b"));
        assertNull(processInstance.getVariable("c"));


        logger.info("### Completing first work item ###");
        Map<String, Object> results = new HashMap<String, Object>();
        results.put("zeta", processInstance.getVariable("z"));
        results.put("equis", processInstance.getVariable("x")+"->modifiedResult");


        ksession.getWorkItemManager().completeWorkItem( workItem.getId(),  results );


        workItem = handler.getWorkItem();
        assertNotNull( workItem );


        logger.info("### Retrieving process instance ###");
        ksession = reloadSession( ksession, kbase, env );
    processInstance = (WorkflowProcessInstance)
      ksession.getProcessInstance(processInstanceId);
    assertNotNull(processInstance);
        logger.info("######## Getting the already Persisted Variables #########");
        assertEquals("SomeString->modifiedResult", processInstance.getVariable("x"));
        assertEquals("This is a test Entity", ((MyEntity) processInstance.getVariable("y")).getTest());
        assertEquals("This is a test SerializableObject", ((MyVariableSerializable) processInstance.getVariable("z")).getText());
        assertEquals("Some new String", processInstance.getVariable("a"));
        assertEquals("This is a new test Entity", ((MyEntity) processInstance.getVariable("b")).getTest());
        assertEquals("This is a new test SerializableObject", ((MyVariableSerializable) processInstance.getVariable("c")).getText());
        logger.info("### Completing second work item ###");
        results = new HashMap<String, Object>();
        results.put("zeta", processInstance.getVariable("z"));
        results.put("equis", processInstance.getVariable("x"));
        ksession.getWorkItemManager().completeWorkItem( workItem.getId(),  results );




        workItem = handler.getWorkItem();
        assertNotNull(workItem);


        logger.info("### Retrieving process instance ###");
        ksession = reloadSession( ksession, kbase, env );
        processInstance = (WorkflowProcessInstance)
          ksession.getProcessInstance(processInstanceId);
        assertNotNull(processInstance);
        assertEquals("SomeString->modifiedResult", processInstance.getVariable("x"));
        assertEquals("This is a test Entity", ((MyEntity) processInstance.getVariable("y")).getTest());
        assertEquals("This is a test SerializableObject", ((MyVariableSerializable) processInstance.getVariable("z")).getText());
        assertEquals("Some changed String", processInstance.getVariable("a"));
        assertEquals("This is a changed test Entity", ((MyEntity) processInstance.getVariable("b")).getTest());
        assertEquals("This is a changed test SerializableObject", ((MyVariableSerializable) processInstance.getVariable("c")).getText());
        logger.info("### Completing third work item ###");
        results = new HashMap<String, Object>();
        results.put("zeta", processInstance.getVariable("z"));
        results.put("equis", processInstance.getVariable("x"));
        ksession.getWorkItemManager().completeWorkItem( workItem.getId(),  results );


        workItem = handler.getWorkItem();
        assertNull(workItem);

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  public void abortWorkItem(WorkItem workItem, WorkItemManager manager) {
  }
  
  public WorkItem getWorkItem() {
    WorkItem result = workItem;
    workItem = null;
    return result;
  }

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                        person );
        WorkflowProcessInstance processInstance = (WorkflowProcessInstance) ksession.startProcess( "org.drools.actions",
                                                                                                   parameters );
        assertEquals( ProcessInstance.STATE_ACTIVE,
                      processInstance.getState() );
        WorkItem workItem = handler.getWorkItem();
        assertNotNull( workItem );
        assertEquals( "John Doe",
                      workItem.getParameter( "ActorId" ) );
        assertEquals( "John Doe",
                      workItem.getParameter( "Content" ) );
        assertEquals( "John Doe",
                      workItem.getParameter( "Comment" ) );


        assertEquals( WorkItem.PENDING,
                      workItem.getState() );


        execContent( "testCompleteWorkItem.in.1",
                     Long.toString( workItem.getId() ) );


        assertEquals( WorkItem.COMPLETED,
                      workItem.getState() );


        assertEquals( ProcessInstance.STATE_COMPLETED,
                      processInstance.getState() );


        parameters = new HashMap<String, Object>();
        parameters.put( "UserName",
                        "Jane Doe" );
        parameters.put( "MyObject",
                        "SomeString" );
        person = new Person();
        person.setName( "Jane Doe" );
        parameters.put( "Person",
                        person );
        processInstance = (WorkflowProcessInstance) ksession.startProcess( "org.drools.actions",
                                                                           parameters );
        assertEquals( ProcessInstance.STATE_ACTIVE,
                      processInstance.getState() );
        workItem = handler.getWorkItem();
        assertNotNull( workItem );
        assertEquals( "Jane Doe",
                      workItem.getParameter( "ActorId" ) );
        assertEquals( "SomeString",
                      workItem.getParameter( "Attachment" ) );
        assertEquals( "Jane Doe",
                      workItem.getParameter( "Content" ) );
        assertEquals( "Jane Doe",
                      workItem.getParameter( "Comment" ) );


        assertEquals( WorkItem.PENDING,
                      workItem.getState() );


        execContent( "testCompleteWorkItem.in.2",
                     Long.toString( workItem.getId() ) );


        assertEquals( WorkItem.COMPLETED,
                      workItem.getState() );


        assertEquals( ProcessInstance.STATE_COMPLETED,
                      processInstance.getState() );
        assertEquals( "SomeOtherString",
                      processInstance.getVariable( "MyObject" ) );

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                        person );
        WorkflowProcessInstance processInstance = (WorkflowProcessInstance) ksession.startProcess( "org.drools.actions",
                                                                                                   parameters );
        assertEquals( ProcessInstance.STATE_ACTIVE,
                      processInstance.getState() );
        WorkItem workItem = handler.getWorkItem();
        assertNotNull( workItem );


        assertEquals( WorkItem.PENDING,
                      workItem.getState() );


        execContent( "testAbortWorkItem.in.1",
                     Long.toString( workItem.getId() ) );


        assertEquals( WorkItem.ABORTED,
                      workItem.getState() );
    }

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                        person );
        WorkflowProcessInstance processInstance = (WorkflowProcessInstance) ksession.startProcess( "org.drools.actions",
                                                                                                   parameters );
        assertEquals( ProcessInstance.STATE_ACTIVE,
                      processInstance.getState() );
        WorkItem workItem = handler.getWorkItem();
        assertNotNull( workItem );


        assertEquals( WorkItem.PENDING,
                      workItem.getState() );


        String inXml = "<abort-work-item id='" + workItem.getId() + "' />";
        setExec( ksession );


        String outXml = template.requestBody( "direct:exec",
                                              inXml,
                                              String.class );


        assertEquals( WorkItem.ABORTED,
                      workItem.getState() );
    }

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                        person );
        WorkflowProcessInstance processInstance = (WorkflowProcessInstance) ksession.startProcess( "org.drools.actions",
                                                                                                   parameters );
        assertEquals( ProcessInstance.STATE_ACTIVE,
                      processInstance.getState() );
        WorkItem workItem = handler.getWorkItem();
        assertNotNull( workItem );
        assertEquals( "John Doe",
                      workItem.getParameter( "ActorId" ) );
        assertEquals( "John Doe",
                      workItem.getParameter( "Content" ) );
        assertEquals( "John Doe",
                      workItem.getParameter( "Comment" ) );


        assertEquals( WorkItem.PENDING,
                      workItem.getState() );


        String inXml = "";
        inXml = "<complete-work-item id='" + workItem.getId() + "' />";
        setExec( ksession );


        String outXml = template.requestBody( "direct:exec",
                                              inXml,
                                              String.class );


        assertEquals( WorkItem.COMPLETED,
                      workItem.getState() );


        assertEquals( ProcessInstance.STATE_COMPLETED,
                      processInstance.getState() );


        parameters = new HashMap<String, Object>();
        parameters.put( "UserName",
                        "Jane Doe" );
        parameters.put( "MyObject",
                        "SomeString" );
        person = new Person();
        person.setName( "Jane Doe" );
        parameters.put( "Person",
                        person );
        processInstance = (WorkflowProcessInstance) ksession.startProcess( "org.drools.actions",
                                                                           parameters );
        assertEquals( ProcessInstance.STATE_ACTIVE,
                      processInstance.getState() );
        workItem = handler.getWorkItem();
        assertNotNull( workItem );
        assertEquals( "Jane Doe",
                      workItem.getParameter( "ActorId" ) );
        assertEquals( "SomeString",
                      workItem.getParameter( "Attachment" ) );
        assertEquals( "Jane Doe",
                      workItem.getParameter( "Content" ) );
        assertEquals( "Jane Doe",
                      workItem.getParameter( "Comment" ) );


        assertEquals( WorkItem.PENDING,
                      workItem.getState() );


        inXml = "";
        inXml += "<complete-work-item id='" + workItem.getId() + "' >";
        inXml += "    <result identifier='Result'>";
        inXml += "        <string>SomeOtherString</string>";
        inXml += "    </result>";
        inXml += "</complete-work-item>";


        outXml = template.requestBody( "direct:exec",
                                       inXml,
                                       String.class );


        assertEquals( WorkItem.COMPLETED,
                      workItem.getState() );


        assertEquals( ProcessInstance.STATE_COMPLETED,
                      processInstance.getState() );
        assertEquals( "SomeOtherString",
                      processInstance.getVariable( "MyObject" ) );

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