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

        startProcessCommand.setProcessId( "org.drools.test.TestProcess" );
        ProcessInstance processInstance = service.execute( startProcessCommand );
        System.out.println( "Started process instance " + processInstance.getId() );


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


        service = new SingleSessionCommandService( sessionId,
                                                   kbase,
                                                   config,
                                                   env );
        GetProcessInstanceCommand getProcessInstanceCommand = new GetProcessInstanceCommand();
        getProcessInstanceCommand.setProcessInstanceId( processInstance.getId() );
        processInstance = service.execute( getProcessInstanceCommand );
        assertNotNull( processInstance );
        service.dispose();


        service = new SingleSessionCommandService( sessionId,
                                                   kbase,
                                                   config,
                                                   env );
        CompleteWorkItemCommand completeWorkItemCommand = new CompleteWorkItemCommand();
        completeWorkItemCommand.setWorkItemId( workItem.getId() );
        service.execute( completeWorkItemCommand );


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


        service = new SingleSessionCommandService( sessionId,
                                                   kbase,
                                                   config,
                                                   env );
        getProcessInstanceCommand = new GetProcessInstanceCommand();
        getProcessInstanceCommand.setProcessInstanceId( processInstance.getId() );
        processInstance = service.execute( getProcessInstanceCommand );
        assertNotNull( processInstance );
        service.dispose();


        service = new SingleSessionCommandService( sessionId,
                                                   kbase,
                                                   config,
                                                   env );
        completeWorkItemCommand = new CompleteWorkItemCommand();
        completeWorkItemCommand.setWorkItemId( workItem.getId() );
        service.execute( completeWorkItemCommand );


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


        service = new SingleSessionCommandService( sessionId,
                                                   kbase,
                                                   config,
                                                   env );
        getProcessInstanceCommand = new GetProcessInstanceCommand();
        getProcessInstanceCommand.setProcessInstanceId( processInstance.getId() );
        processInstance = service.execute( getProcessInstanceCommand );
        assertNotNull( processInstance );
        service.dispose();


        service = new SingleSessionCommandService( sessionId,
                                                   kbase,
                                                   config,
                                                   env );
        completeWorkItemCommand = new CompleteWorkItemCommand();
        completeWorkItemCommand.setWorkItemId( workItem.getId() );
        service.execute( completeWorkItemCommand );


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

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        ProcessInstance processInstance = service.execute( startProcessCommand );
        System.out.println( "Started process instance " + processInstance.getId() );
        ut.commit();


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


        service = new SingleSessionCommandService( sessionId,
                                                   kbase,
                                                   config,
                                                   env );
        ut.begin();
        GetProcessInstanceCommand getProcessInstanceCommand = new GetProcessInstanceCommand();
        getProcessInstanceCommand.setProcessInstanceId( processInstance.getId() );
        processInstance = service.execute( getProcessInstanceCommand );
        assertNotNull( processInstance );
        ut.commit();
        service.dispose();


        service = new SingleSessionCommandService( sessionId,
                                                   kbase,
                                                   config,
                                                   env );
        ut.begin();
        CompleteWorkItemCommand completeWorkItemCommand = new CompleteWorkItemCommand();
        completeWorkItemCommand.setWorkItemId( workItem.getId() );
        service.execute( completeWorkItemCommand );
        ut.commit();


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


        service = new SingleSessionCommandService( sessionId,
                                                   kbase,
                                                   config,
                                                   env );
        ut.begin();
        getProcessInstanceCommand = new GetProcessInstanceCommand();
        getProcessInstanceCommand.setProcessInstanceId( processInstance.getId() );
        processInstance = service.execute( getProcessInstanceCommand );
        ut.commit();
        assertNotNull( processInstance );
        service.dispose();


        service = new SingleSessionCommandService( sessionId,
                                                   kbase,
                                                   config,
                                                   env );
        ut.begin();
        completeWorkItemCommand = new CompleteWorkItemCommand();
        completeWorkItemCommand.setWorkItemId( workItem.getId() );
        service.execute( completeWorkItemCommand );
        ut.commit();


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


        service = new SingleSessionCommandService( sessionId,
                                                   kbase,
                                                   config,
                                                   env );
        ut.begin();
        getProcessInstanceCommand = new GetProcessInstanceCommand();
        getProcessInstanceCommand.setProcessInstanceId( processInstance.getId() );
        processInstance = service.execute( getProcessInstanceCommand );
        ut.commit();
        assertNotNull( processInstance );
        service.dispose();


        service = new SingleSessionCommandService( sessionId,
                                                   kbase,
                                                   config,
                                                   env );
        ut.begin();
        completeWorkItemCommand = new CompleteWorkItemCommand();
        completeWorkItemCommand.setWorkItemId( workItem.getId() );
        service.execute( completeWorkItemCommand );
        ut.commit();


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

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        RuleFlowProcessInstance processInstance = (RuleFlowProcessInstance) service.execute( startProcessCommand );
        System.out.println( "Started process instance " + processInstance.getId() );
        long processInstanceId = processInstance.getId();


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


        service = new SingleSessionCommandService( sessionId,
                                               ruleBase,
                                                   config,
                                                   env );
        GetProcessInstanceCommand getProcessInstanceCommand = new GetProcessInstanceCommand();
        getProcessInstanceCommand.setProcessInstanceId( processInstanceId );
        processInstance = (RuleFlowProcessInstance) service.execute( getProcessInstanceCommand );
        assertNotNull( processInstance );


        Collection<NodeInstance> nodeInstances = processInstance.getNodeInstances();
        assertEquals( 1,
                      nodeInstances.size() );
        SubProcessNodeInstance subProcessNodeInstance = (SubProcessNodeInstance) nodeInstances.iterator().next();
        long subProcessInstanceId = subProcessNodeInstance.getProcessInstanceId();
        getProcessInstanceCommand = new GetProcessInstanceCommand();
        getProcessInstanceCommand.setProcessInstanceId( subProcessInstanceId );
        RuleFlowProcessInstance subProcessInstance = (RuleFlowProcessInstance) service.execute( getProcessInstanceCommand );
        assertNotNull( subProcessInstance );
        service.dispose();


        service = new SingleSessionCommandService( sessionId,
                                                   ruleBase,
                                                   config,
                                                   env );
        CompleteWorkItemCommand completeWorkItemCommand = new CompleteWorkItemCommand();
        completeWorkItemCommand.setWorkItemId( workItem.getId() );
        service.execute( completeWorkItemCommand );
        service.dispose();


        service = new SingleSessionCommandService( sessionId,
                                                   ruleBase,

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        public WorkItem getWorkItem() {
          if (workItems.size() == 0) {
            return null;
          }
          if (workItems.size() == 1) {
            WorkItem result = workItems.get(0);
            this.workItems.clear();
            return result;
          } else {
            throw new IllegalArgumentException("More than one work item active");
          }

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

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    workItem = null;
    return result;
  }


  public WorkItem getAbortedWorkItem() {
    WorkItem result = aborted;
    aborted = null;
    return result;
  }

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        ProcessInstance processInstance = ksession.startProcess( "org.drools.test.TestProcess" );
        ksession.insert( "TestString" );
        System.out.println( "Started process instance " + processInstance.getId() );


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


        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 );


        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 );


        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 );

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        ProcessInstance processInstance = ksession.startProcess( "org.drools.test.TestProcess" );
        ksession.insert( "TestString" );
        System.out.println( "Started process instance " + processInstance.getId() );


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


        ksession.getWorkItemManager().completeWorkItem( workItem.getId(),
                                                       null );
        
        workItem = handler.getWorkItem();
        assertNotNull( workItem );


        ut.commit();


        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 );


        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 );

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        ProcessInstance processInstance = ksession.startProcess( "org.drools.test.TestProcess" );
        System.out.println( "Started process instance " + processInstance.getId() );


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


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

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        ProcessInstance processInstance = ksession.startProcess( "com.sample.SuperProcess" );
        System.out.println( "Started process instance " + processInstance.getId() );


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


        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 );


        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 );

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