Activti跳过中间节点的helloworld实例程序

http://blog.csdn.net/songzheng_741/article/details/17289633

此实例是一个最简单的在运行时人为动态改变流程运转的实例，意在为任意流、驳回等功能抛砖引玉.

定义一个最简单的流程，它只有一个“开始事件”、一个“ServiceTask”、一个“结束事件”.

我们现在的要实现的是直接跳过ServiceTask。

ServiceTask的实现类只是简单的在控制台输出一条语句.

 public class Log implements JavaDelegate {

     public void execute(DelegateExecution execution) throws Exception {
         System.err.println("如果我出现了，就说明我没被忽略");

     }

 }

控制流向的代码如下

 System.out.println("直接跳过ServiceTask的流程开始..................");

 RepositoryService repositoryService = activitiRule.getRepositoryService();

 ProcessDefinition processDefinition =
         repositoryService.createProcessDefinitionQuery().deploymentId("1").singleResult();

 ProcessDefinitionEntity processDefinitionEntity = (ProcessDefinitionEntity) ((RepositoryServiceImpl) repositoryService)
         .getDeployedProcessDefinition(processDefinition.getId());

 List<ActivityImpl> activities = processDefinitionEntity.getActivities();

 ActivityImpl start = null;
 ActivityImpl task = null;
 ActivityImpl end = null;


 for (ActivityImpl activity : activities) {
     if (activity.getId().equals("startevent1")) {
         start = activity;
     }
     if (activity.getId().equals("usertask1")) {
         task = activity;
     }
     if (activity.getId().equals("endevent1")) {
         end = activity;
     }
 }
 //清除原先的路径
 List<PvmTransition> cacheTran = start.getOutgoingTransitions();
 start.getOutgoingTransitions().clear();
 //创建新路径
 TransitionImpl tran = start.createOutgoingTransition();
 tran.setDestination(end);

 RuntimeService runtimeService = activitiRule.getRuntimeService();
 runtimeService.startProcessInstanceById(processDefinitionEntity.getProcessDefinition().getId());

 //恢复原来路径
 start.getOutgoingTransitions().clear();
 for (PvmTransition transition : cacheTran) {
     start.createOutgoingTransition().setDestination((ActivityImpl) transition.getDestination());
 }

这样ServiceTask将被跳过不会自动执行

当注释掉

start.getOutgoingTransitions().clear();

serviceTask将被执行.

这种方法只会影响一个流程实例的流程定义的内存镜像，其他流程不会受到影响.