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【功能优化】工作流：基于 BPMN 的预测，Util 封装
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YunaiV
parent
4695904fb5
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3afe93a157
@ -6,8 +6,8 @@ Authorization: Bearer {{token}}
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### 请求 /bpm/process-instance/get-bpmn 接口 => 失败
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#GET {{baseUrl}}/bpm/process-instance/get-approval-detail?processInstanceId=1d5fb5a6-85f8-11ef-b717-7e93075f94e3
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#GET {{baseUrl}}/bpm/process-instance/get-approval-detail?processInstanceId=3ee5c5ba-904a-11ef-a76e-b2ed5d6ef911
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GET {{baseUrl}}/bpm/process-instance/get-approval-detail?processInstanceId=f630dfa2-8f92-11ef-947c-ba5e239a6eb4
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#GET {{baseUrl}}/bpm/process-instance/get-approval-detail?processInstanceId=f630dfa2-8f92-11ef-947c-ba5e239a6eb4
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Content-Type: application/json
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tenant-id: 1
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Authorization: Bearer {{token}}
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@ -18,18 +18,13 @@ import cn.iocoder.yudao.module.bpm.enums.definition.BpmUserTaskRejectHandlerType
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import cn.iocoder.yudao.module.bpm.framework.flowable.core.enums.BpmnModelConstants;
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import com.google.common.collect.Maps;
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import lombok.extern.slf4j.Slf4j;
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import org.apache.commons.lang3.StringUtils;
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import org.flowable.bpmn.converter.BpmnXMLConverter;
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import org.flowable.bpmn.model.Process;
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import org.flowable.bpmn.model.*;
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import org.flowable.common.engine.api.FlowableException;
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import org.flowable.common.engine.api.variable.VariableContainer;
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import org.flowable.common.engine.impl.util.io.BytesStreamSource;
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import org.flowable.engine.ManagementService;
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import javax.script.ScriptEngine;
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import javax.script.ScriptEngineManager;
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import javax.script.ScriptException;
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import java.util.*;
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import static cn.iocoder.yudao.module.bpm.framework.flowable.core.enums.BpmnModelConstants.*;
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@ -40,8 +35,9 @@ import static org.flowable.bpmn.constants.BpmnXMLConstants.FLOWABLE_EXTENSIONS_P
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* BPMN Model 操作工具类。目前分成三部分：
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*
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* 1. BPMN 修改 + 解析元素相关的方法
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* 2. BPM 简单查找相关的方法
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* 3. BPM 复杂遍历相关的方法
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* 2. BPMN 简单查找相关的方法
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* 3. BPMN 复杂遍历相关的方法
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* 4. BPMN 流程预测相关的方法
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*
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* @author 芋道源码
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*/
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@ -667,142 +663,115 @@ public class BpmnModelUtils {
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return userTaskList;
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}
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// TODO FROM 欢欢
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// ========== BPMN 流程预测相关的方法 ==========
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public static void simulateProcess(BpmnModel bpmnModel, Map<String, Object> variables, List<FlowElement> flowElementList,
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VariableContainer variableContainer) {
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List<StartEvent> startEvents = bpmnModel.getMainProcess().findFlowElementsOfType(StartEvent.class);
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//只处理一个开始节点的情况
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simulateNextFlowElements(startEvents.get(0), variables, flowElementList, variableContainer);
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/**
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* 流程预测，返回 StartEvent、UserTask、ServiceTask、EndEvent 节点元素，最终是 List 串行结果
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*
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* @param bpmnModel BPMN 图
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* @param variables 变量
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* @return 节点元素数组
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*/
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public static List<FlowElement> simulateProcess(BpmnModel bpmnModel, Map<String, Object> variables) {
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List<FlowElement> resultElements = new ArrayList<>();
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Set<FlowElement> visitElements = new HashSet<>();
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// 从 StartEvent 开始遍历
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StartEvent startEvent = getStartEvent(bpmnModel);
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simulateNextFlowElements(startEvent, variables, resultElements, visitElements);
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// 将 EndEvent 放在末尾。原因是，DFS 遍历，可能 EndEvent 在 resultElements 中
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List<FlowElement> endEvents = CollUtil.removeWithAddIf(resultElements,
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flowElement -> flowElement instanceof EndEvent);
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resultElements.addAll(endEvents);
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return resultElements;
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}
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private static void simulateNextFlowElements(FlowElement flowElement, Map<String, Object> variables, List<FlowElement> flowElementList,
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VariableContainer variableContainer) {
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if (flowElement instanceof StartEvent) {
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StartEvent startEvent = (StartEvent) flowElement;
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flowElementList.add(startEvent);
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List<SequenceFlow> outgoingFlows = startEvent.getOutgoingFlows();
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for (SequenceFlow flow : outgoingFlows) {
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FlowElement targetFlowElement = flow.getTargetFlowElement();
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simulateNextFlowElements(targetFlowElement, variables, flowElementList, variableContainer);
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}
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} else if (flowElement instanceof UserTask) {
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UserTask userTask = (UserTask) flowElement;
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flowElementList.add(userTask);
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List<SequenceFlow> outgoingFlows = userTask.getOutgoingFlows();
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for (SequenceFlow flow : outgoingFlows) {
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FlowElement targetFlowElement = flow.getTargetFlowElement();
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simulateNextFlowElements(targetFlowElement, variables, flowElementList, variableContainer);
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}
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} else if (flowElement instanceof ServiceTask) { // TODO 芋艿：待测试
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ServiceTask serviceTask = (ServiceTask) flowElement;
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flowElementList.add(serviceTask);
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List<SequenceFlow> outgoingFlows = serviceTask.getOutgoingFlows();
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for (SequenceFlow flow : outgoingFlows) {
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FlowElement targetFlowElement = flow.getTargetFlowElement();
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simulateNextFlowElements(targetFlowElement, variables, flowElementList, variableContainer);
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}
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} else if (flowElement instanceof ExclusiveGateway) {
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Gateway gateway = (Gateway) flowElement;
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boolean found = false;
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for (SequenceFlow flow : gateway.getOutgoingFlows()) {
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if (ObjUtil.equal(gateway.getDefaultFlow(), flow.getId())) {
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continue;
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}
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if (evalConditionExpress(variableContainer, flow.getConditionExpression())) {
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FlowElement targetFlowElement = flow.getTargetFlowElement();
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simulateNextFlowElements(targetFlowElement, variables, flowElementList, variableContainer);
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found = true;
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break;
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}
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}
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if (!found) {
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SequenceFlow targetFlowElement = CollUtil.findOne(gateway.getOutgoingFlows(),
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c -> ObjUtil.equal(gateway.getDefaultFlow(), c.getId()));
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if (targetFlowElement == null && gateway.getOutgoingFlows().size() == 1) {
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targetFlowElement = gateway.getOutgoingFlows().get(0);
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}
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if (targetFlowElement != null && targetFlowElement.getTargetFlowElement() != null) {
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simulateNextFlowElements(targetFlowElement.getTargetFlowElement(), variables, flowElementList, variableContainer);
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}
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}
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} else if (flowElement instanceof InclusiveGateway) {
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Gateway gateway = (Gateway) flowElement;
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boolean found = false;
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for (SequenceFlow flow : gateway.getOutgoingFlows()) {
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if (ObjUtil.equal(gateway.getDefaultFlow(), flow.getId())) {
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continue;
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}
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if (evalConditionExpress(variableContainer, flow.getConditionExpression())) {
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FlowElement targetFlowElement = flow.getTargetFlowElement();
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simulateNextFlowElements(targetFlowElement, variables, flowElementList, variableContainer);
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found = true;
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}
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}
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if (!found) {
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SequenceFlow targetFlowElement = CollUtil.findOne(gateway.getOutgoingFlows(),
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c -> ObjUtil.equal(gateway.getDefaultFlow(), c.getId()));
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if (targetFlowElement == null && gateway.getOutgoingFlows().size() == 1) {
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targetFlowElement = gateway.getOutgoingFlows().get(0);
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}
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if (targetFlowElement != null && targetFlowElement.getTargetFlowElement() != null) {
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simulateNextFlowElements(targetFlowElement.getTargetFlowElement(), variables, flowElementList, variableContainer);
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}
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}
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} else if (flowElement instanceof ParallelGateway) {
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Gateway gateway = (Gateway) flowElement;
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for (SequenceFlow flow : gateway.getOutgoingFlows()) {
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FlowElement targetFlowElement = flow.getTargetFlowElement();
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simulateNextFlowElements(targetFlowElement, variables, flowElementList, variableContainer);
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}
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} else if (flowElement instanceof EndEvent) {
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EndEvent endEvent = (EndEvent) flowElement;
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flowElementList.add(endEvent);
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@SuppressWarnings("PatternVariableCanBeUsed")
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private static void simulateNextFlowElements(FlowElement currentElement, Map<String, Object> variables,
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List<FlowElement> resultElements, Set<FlowElement> visitElements) {
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// 如果为空，或者已经遍历过，则直接结束
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if (currentElement == null) {
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return;
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}
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}
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private static boolean evaluateCondition(SequenceFlow flow, Map<String, Object> variables) {
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String conditionExpression = flow.getConditionExpression();
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if (StringUtils.isEmpty(conditionExpression)) {
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return false;
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if (visitElements.contains(currentElement)) {
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return;
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}
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try {
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//兼容UEL和JS语法
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if (conditionExpression.startsWith("${") && conditionExpression.endsWith("}")) {
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conditionExpression = conditionExpression.substring(2, conditionExpression.length() - 1);
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}
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return evaluateExpression(conditionExpression, variables);
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} catch (ScriptException e) {
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e.printStackTrace();
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}
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return false;
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}
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visitElements.add(currentElement);
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public static boolean evaluateExpression(String expression, Map<String, Object> variables) throws ScriptException {
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ScriptEngineManager engineManager = new ScriptEngineManager();
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ScriptEngine engine = engineManager.getEngineByName("JavaScript");
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// 设置变量
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for (Map.Entry<String, Object> entry : variables.entrySet()) {
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engine.put(entry.getKey(), entry.getValue());
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// 情况：StartEvent/EndEvent/UserTask/ServiceTask
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if (currentElement instanceof StartEvent
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|| currentElement instanceof EndEvent
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|| currentElement instanceof UserTask
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|| currentElement instanceof ServiceTask) {
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// 添加元素
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FlowNode startEvent = (FlowNode) currentElement;
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resultElements.add(startEvent);
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// 遍历子节点
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startEvent.getOutgoingFlows().forEach(
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nextElement -> simulateNextFlowElements(nextElement.getTargetFlowElement(), variables, resultElements, visitElements));
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return;
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}
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// 评估表达式
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Object result = engine.eval(expression);
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if (result instanceof Boolean) {
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return (Boolean) result;
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} else {
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throw new ScriptException("Expression does not evaluate to boolean");
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// 情况：ExclusiveGateway 排它，只有一个满足条件的。如果没有，就走默认的
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if (currentElement instanceof ExclusiveGateway) {
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// 查找满足条件的 SequenceFlow 路径
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Gateway gateway = (Gateway) currentElement;
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SequenceFlow matchSequenceFlow = CollUtil.findOne(gateway.getOutgoingFlows(),
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flow -> ObjUtil.notEqual(gateway.getDefaultFlow(), flow.getId())
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&& evalConditionExpress(variables, flow.getConditionExpression()));
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if (matchSequenceFlow == null) {
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matchSequenceFlow = CollUtil.findOne(gateway.getOutgoingFlows(),
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flow -> ObjUtil.notEqual(gateway.getDefaultFlow(), flow.getId()));
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// 特殊：没有默认的情况下，并且只有 1 个条件，则认为它是默认的
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if (matchSequenceFlow == null && gateway.getOutgoingFlows().size() == 1) {
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matchSequenceFlow = gateway.getOutgoingFlows().get(0);
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}
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}
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// 遍历满足条件的 SequenceFlow 路径
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if (matchSequenceFlow != null) {
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simulateNextFlowElements(matchSequenceFlow.getTargetFlowElement(), variables, resultElements, visitElements);
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}
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return;
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}
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// 情况：InclusiveGateway 包容，多个满足条件的。如果没有，就走默认的
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if (currentElement instanceof InclusiveGateway) {
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// 查找满足条件的 SequenceFlow 路径
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Gateway gateway = (Gateway) currentElement;
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Collection<SequenceFlow> matchSequenceFlows = CollUtil.filterNew(gateway.getOutgoingFlows(),
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flow -> ObjUtil.notEqual(gateway.getDefaultFlow(), flow.getId())
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&& evalConditionExpress(variables, flow.getConditionExpression()));
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if (CollUtil.isEmpty(matchSequenceFlows)) {
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matchSequenceFlows = CollUtil.filterNew(gateway.getOutgoingFlows(),
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flow -> ObjUtil.notEqual(gateway.getDefaultFlow(), flow.getId()));
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// 特殊：没有默认的情况下，并且只有 1 个条件，则认为它是默认的
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if (CollUtil.isEmpty(matchSequenceFlows) && gateway.getOutgoingFlows().size() == 1) {
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matchSequenceFlows = gateway.getOutgoingFlows();
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}
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}
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// 遍历满足条件的 SequenceFlow 路径
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matchSequenceFlows.forEach(
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flow -> simulateNextFlowElements(flow.getTargetFlowElement(), variables, resultElements, visitElements));
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}
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if (currentElement instanceof ParallelGateway) {
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Gateway gateway = (Gateway) currentElement;
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// 遍历子节点
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gateway.getOutgoingFlows().forEach(
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nextElement -> simulateNextFlowElements(nextElement.getTargetFlowElement(), variables, resultElements, visitElements));
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return;
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}
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}
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/**
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* 计算条件表达式的值
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* 计算条件表达式是否为 true 满足条件
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*
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* @param variableContainer 流程实例
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* @param express 条件表达式
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* @param variables 流程实例
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* @param express 条件表达式
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* @return 是否满足条件
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*/
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private static Boolean evalConditionExpress(VariableContainer variableContainer, String express) {
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private static boolean evalConditionExpress(Map<String, Object> variables, String express) {
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ManagementService managementService = SpringUtil.getBean(ManagementService.class);
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if (express == null) {
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return Boolean.FALSE;
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@ -810,7 +779,7 @@ public class BpmnModelUtils {
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// TODO @jason：疑问，为啥这里要在 managementService 里执行哈？
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Object result = managementService.executeCommand(context -> {
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try {
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return FlowableUtils.getExpressionValue(variableContainer, express);
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return FlowableUtils.getExpressionValue(variables, express);
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} catch (FlowableException ex) {
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log.error("[evalConditionExpress][条件表达式({}) 解析报错", express, ex);
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return Boolean.FALSE;
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@ -10,6 +10,7 @@ import org.flowable.common.engine.api.delegate.Expression;
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import org.flowable.common.engine.api.variable.VariableContainer;
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import org.flowable.common.engine.impl.el.ExpressionManager;
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import org.flowable.common.engine.impl.identity.Authentication;
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import org.flowable.common.engine.impl.variable.MapDelegateVariableContainer;
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import org.flowable.engine.ProcessEngineConfiguration;
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import org.flowable.engine.history.HistoricProcessInstance;
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import org.flowable.engine.impl.cfg.ProcessEngineConfigurationImpl;
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@ -227,4 +228,10 @@ public class FlowableUtils {
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return expression.getValue(variableContainer);
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}
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public static Object getExpressionValue(Map<String, Object> variable, String expressionString) {
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VariableContainer variableContainer = new MapDelegateVariableContainer(variable,
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VariableContainer.empty());
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return getExpressionValue(variableContainer, expressionString);
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}
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}
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