activiti和设计模式(8)

BPMN中不仅规定了每一个图标代表的意义，例如：
exclusivegateway的示意图
而且还规定了每一个每一图形的行为标准，在Activiti中动作行为封装在了ActivityBehavior中，在ActivityBehavior中，不仅封装的有行为，线上的条件的判断。
首先是ActivityBehavior的构建，采用的是简单工厂的设计模式：

public interface ActivityBehaviorFactory {

  public abstract NoneStartEventActivityBehavior createNoneStartEventActivityBehavior(StartEvent startEvent);

  public abstract EventSubProcessStartEventActivityBehavior createEventSubProcessStartEventActivityBehavior(StartEvent startEvent, String activityId);

  public abstract TaskActivityBehavior createTaskActivityBehavior(Task task);

  public abstract ManualTaskActivityBehavior createManualTaskActivityBehavior(ManualTask manualTask);

  public abstract ReceiveTaskActivityBehavior createReceiveTaskActivityBehavior(ReceiveTask receiveTask);

  public abstract UserTaskActivityBehavior createUserTaskActivityBehavior(UserTask userTask, TaskDefinition taskDefinition);

  public abstract ClassDelegate createClassDelegateServiceTask(ServiceTask serviceTask);

  public abstract ServiceTaskDelegateExpressionActivityBehavior createServiceTaskDelegateExpressionActivityBehavior(ServiceTask serviceTask);

  public abstract ServiceTaskExpressionActivityBehavior createServiceTaskExpressionActivityBehavior(ServiceTask serviceTask);

  public abstract WebServiceActivityBehavior createWebServiceActivityBehavior(ServiceTask serviceTask);

  public abstract WebServiceActivityBehavior createWebServiceActivityBehavior(SendTask sendTask);

  public abstract MailActivityBehavior createMailActivityBehavior(ServiceTask serviceTask);

  public abstract MailActivityBehavior createMailActivityBehavior(SendTask sendTask);

  // We do not want a hard dependency on the Mule module, hence we return ActivityBehavior and instantiate
  // the delegate instance using a string instead of the Class itself.
  public abstract ActivityBehavior createMuleActivityBehavior(ServiceTask serviceTask, BpmnModel bpmnModel);

  public abstract ActivityBehavior createMuleActivityBehavior(SendTask sendTask, BpmnModel bpmnModel);

  public abstract ActivityBehavior createCamelActivityBehavior(ServiceTask serviceTask, BpmnModel bpmnModel);

  public abstract ActivityBehavior createCamelActivityBehavior(SendTask sendTask, BpmnModel bpmnModel);

  public abstract ShellActivityBehavior createShellActivityBehavior(ServiceTask serviceTask);

  public abstract ActivityBehavior createBusinessRuleTaskActivityBehavior(BusinessRuleTask businessRuleTask);

  public abstract ScriptTaskActivityBehavior createScriptTaskActivityBehavior(ScriptTask scriptTask);

  public abstract ExclusiveGatewayActivityBehavior createExclusiveGatewayActivityBehavior(ExclusiveGateway exclusiveGateway);

  public abstract ParallelGatewayActivityBehavior createParallelGatewayActivityBehavior(ParallelGateway parallelGateway);

  public abstract InclusiveGatewayActivityBehavior createInclusiveGatewayActivityBehavior(InclusiveGateway inclusiveGateway);

  public abstract EventBasedGatewayActivityBehavior createEventBasedGatewayActivityBehavior(EventGateway eventGateway);

  public abstract SequentialMultiInstanceBehavior createSequentialMultiInstanceBehavior(ActivityImpl activity, AbstractBpmnActivityBehavior innerActivityBehavior);

  public abstract ParallelMultiInstanceBehavior createParallelMultiInstanceBehavior(ActivityImpl activity, AbstractBpmnActivityBehavior innerActivityBehavior);

  public abstract SubProcessActivityBehavior createSubprocActivityBehavior(SubProcess subProcess);

  public abstract CallActivityBehavior createCallActivityBehavior(CallActivity callActivity);

  public abstract TransactionActivityBehavior createTransactionActivityBehavior(Transaction transaction);

  public abstract IntermediateCatchEventActivityBehavior createIntermediateCatchEventActivityBehavior(IntermediateCatchEvent intermediateCatchEvent);

  public abstract IntermediateThrowNoneEventActivityBehavior createIntermediateThrowNoneEventActivityBehavior(ThrowEvent throwEvent);

  public abstract IntermediateThrowSignalEventActivityBehavior createIntermediateThrowSignalEventActivityBehavior(ThrowEvent throwEvent, Signal signal, EventSubscriptionDeclaration eventSubscriptionDeclaration);

  public abstract IntermediateThrowCompensationEventActivityBehavior createIntermediateThrowCompensationEventActivityBehavior(ThrowEvent throwEvent, CompensateEventDefinition compensateEventDefinition);

 ...........

}

默认的实现是：

public class DefaultActivityBehaviorFactory extends AbstractBehaviorFactory implements ActivityBehaviorFactory {

  // Start event
  public final static String EXCEPTION_MAP_FIELD = "mapExceptions";

  public NoneStartEventActivityBehavior createNoneStartEventActivityBehavior(StartEvent startEvent) {
    return new NoneStartEventActivityBehavior();
  }

  public EventSubProcessStartEventActivityBehavior createEventSubProcessStartEventActivityBehavior(StartEvent startEvent, String activityId) {
    return new EventSubProcessStartEventActivityBehavior(activityId);
  }

  // Task

  public TaskActivityBehavior createTaskActivityBehavior(Task task) {
    return new TaskActivityBehavior();
  }
...........
}

我们在「activiti和设计模式(7)」 中定义的usertask是多实例的，所以对应的Behavior是：

Published on Aug 13, 2017 in categories activiti-desigen-pattern