activiti 6.0自由跳转

最新推荐文章于 2022-10-28 11:33:36 发布

原创最新推荐文章于 2022-10-28 11:33:36 发布 · 2k 阅读

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本文介绍了一种在工作流引擎中实现任务跳转的方法，通过查询任务、获取流程定义和节点，然后删除当前任务并执行跳转命令，使流程执行指向指定节点，适用于多种业务场景。

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		Task task = taskService.createTaskQuery() // 创建任务查询
                        .processInstanceId(自己的ProcessInstanceId) // 根据流程实例id查询
                        .singleResult();

                //获取流程定义
                Process process = repositoryService.getBpmnModel(task.getProcessDefinitionId()).getMainProcess();
                //获取目标节点定义
                FlowNode targetNode = (FlowNode) process.getFlowElement("要跳转的节点名");
                //删除当前运行任务
                String executionEntityId = managementService.executeCommand(new DeleteTaskCmd(task.getId()));
                //流程执行到来源节点
                managementService.executeCommand(new SetFLowNodeAndGoCmd(targetNode, executionEntityId));
   
	 //删除当前运行时任务命令，并返回当前任务的执行对象id
    //这里继承了NeedsActiveTaskCmd，主要时很多跳转业务场景下，要求不能时挂起任务。可以直接继承Command即可
    public class DeleteTaskCmd extends NeedsActiveTaskCmd<String> {
        public DeleteTaskCmd(String taskId) {
            super(taskId);
        }
        @Override
        public String execute(CommandContext commandContext, TaskEntity currentTask) {
            //获取所需服务
            TaskEntityManagerImpl taskEntityManager = (TaskEntityManagerImpl) commandContext.getTaskEntityManager();
            //获取当前任务的来源任务及来源节点信息
            ExecutionEntity executionEntity = currentTask.getExecution();
            //删除当前任务,来源任务
            taskEntityManager.deleteTask(currentTask, "jumpReason", false, false);
            return executionEntity.getId();
        }
        @Override
        public String getSuspendedTaskException() {
            return "挂起的任务不能跳转";
        }
    }


    //根据提供节点和执行对象id，进行跳转命令
    public class SetFLowNodeAndGoCmd implements Command<Void> {
        private FlowNode flowElement;
        private String executionId;

        public SetFLowNodeAndGoCmd(FlowNode flowElement, String executionId) {
            this.flowElement = flowElement;
            this.executionId = executionId;
        }

        @Override
        public Void execute(CommandContext commandContext) {
            //获取目标节点的来源连线
            List<SequenceFlow> flows = flowElement.getIncomingFlows();
            if (flows == null || flows.size() < 1) {
                throw new ActivitiException("回退错误，目标节点没有来源连线");
            }
            //随便选一条连线来执行，时当前执行计划为，从连线流转到目标节点，实现跳转
            ExecutionEntity executionEntity = commandContext.getExecutionEntityManager().findById(executionId);
            executionEntity.setCurrentFlowElement(flows.get(0));
            commandContext.getAgenda().planTakeOutgoingSequenceFlowsOperation(executionEntity, true);
            return null;
        }
    }