activiti6 gets the next node (continuously updated)
This method is to use the outgoingFlows attribute (identifying the output object) in the connection object (SequenceFlow class) between the current node and the node after the current node, and then judge the output object to determine whether it is an exclusive gateway (ExclusiveGateway). If it is an exclusive gateway, it will determine which node the next node is through the logical processing of its own program.
There are comments after each line of code.
code
* 获取下一UserTask任务节点
* task 当前任务task对象
* data 表单数据 (主要为了排他网关分支节点做判断用, 例如:请假2天需要提交至项目经理, 请假5天需要提交至部门经理)
*/
public UserTask getNextUserTaskNode(Task task,Map data) {
FlowElement resultTask = null;//定义返回值
BpmnModel bpmnModel = repositoryService.getBpmnModel(task.getProcessDefinitionId());//通过流程定义ID取到bomnModel对象
FlowElement flowElement = bpmnModel.getProcesses().get(0).getFlowElement(task.getTaskDefinitionKey());//直接使用当前task的定义key去查找模型中的节点(当前任务节点)
UserTask nowUserTask = (UserTask)flowElement;//获取当前UserTask
List<SequenceFlow> nowOutgoingFlows = nowUserTask.getOutgoingFlows();//当前任务流向节点(SequenceFlow: 连接两个节点之间的线)
if(ToolUtil.isNotEmpty(nowOutgoingFlows) && nowOutgoingFlows.size() == 1 ) {
//如果只流向一个节点
FlowElement nextFlowElement = nowOutgoingFlows.get(0).getTargetFlowElement();//下一节点
if(UserTask.class.isInstance(nextFlowElement)) {
//判断节点是否是UserTask
resultTask = nextFlowElement;
}else if(ExclusiveGateway.class.isInstance(nextFlowElement)){
//判断是否是排他网关
ExclusiveGateway exclusiveGateway = (ExclusiveGateway)nextFlowElement;
List<SequenceFlow> exclusiveOutgoingFlows = exclusiveGateway.getOutgoingFlows();//排他网关流向节点
if(ToolUtil.isNotEmpty(exclusiveOutgoingFlows) && exclusiveOutgoingFlows.size() == 1 && (UserTask.class.isInstance(exclusiveOutgoingFlows.get(0).getTargetFlowElement())|| EndEvent.class.isInstance(exclusiveOutgoingFlows.get(0).getTargetFlowElement()))) {
//如果排他网关只有一条线路信息并且是UserTask节点
resultTask = exclusiveOutgoingFlows.get(0).getTargetFlowElement();
}else if(exclusiveOutgoingFlows.size() > 1) {
//如果排他网关有多条线路信息
for (SequenceFlow sequenceFlow : exclusiveOutgoingFlows) {
//通过流转网关ID和线路ID 获取分支对象(BranchCondition 自己对条件判断的封装)
BranchCondition branchCondition = branchConditionService.getOne(new QueryWrapper<BranchCondition>().eq("BRANCH_ID", exclusiveGateway.getId()).eq("SEQUENCEFLOW_ID", sequenceFlow.getId()).eq("PROCDEF_ID", task.getProcessDefinitionId()));
if(ToolUtil.isEmpty(branchCondition) || ToolUtil.isEmpty(branchCondition.getExitCondition())) {
continue;
}
ElData elData = disposeExitCondition(branchCondition.getExitCondition(),data);//这个方法是我通过规则和数据，来判断是否符合转入节点的条件
if(isCondition(elData.getEl(),elData.getElValueData())) {
//判断跳转条件是否成立
resultTask = sequenceFlow.getTargetFlowElement();//条件成立 返回节点对象
}
}
}
}
}
return resultTask;
}
Parse EL expression method isCondition
/**
* 通过el表达式 与 data集合 判断是否符合条件
* @param el
* @param data
* @return
*/
public boolean isCondition(String el,Map<String,String> data) {
ExpressionFactory expressionFactory = new ExpressionFactoryImpl();
SimpleContext simpleContext = new SimpleContext();
for (String dataKey : data.keySet()) {
simpleContext.setVariable(dataKey, expressionFactory.createValueExpression(data.get(dataKey), String.class));
}
ValueExpression e = expressionFactory.createValueExpression(simpleContext, el, boolean.class);
return (Boolean) e.getValue(simpleContext);
}
There are many ways to get the next node, but the core is the operation of bpmnModel object and flowElement node object.
If you have any questions, please leave them in the comments and I will reply in time. If you have any good ideas, you can write them in the comment area