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.