package cn.iocoder.yudao.module.bpm.framework.flowable.core.util;
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import cn.hutool.core.collection.CollUtil;
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import cn.hutool.core.convert.Convert;
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import cn.hutool.core.lang.Assert;
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import cn.hutool.core.map.MapUtil;
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import cn.hutool.core.util.ArrayUtil;
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import cn.hutool.core.util.ObjUtil;
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import cn.hutool.core.util.StrUtil;
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import cn.iocoder.yudao.framework.common.util.collection.CollectionUtils;
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import cn.iocoder.yudao.framework.common.util.json.JsonUtils;
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import cn.iocoder.yudao.framework.common.util.number.NumberUtils;
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import cn.iocoder.yudao.framework.common.util.string.StrUtils;
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import cn.iocoder.yudao.module.bpm.controller.admin.definition.vo.model.simple.BpmSimpleModelNodeVO;
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import cn.iocoder.yudao.module.bpm.controller.admin.task.vo.task.BpmTaskRespVO;
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import cn.iocoder.yudao.module.bpm.enums.definition.*;
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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.flowable.bpmn.converter.BpmnXMLConverter;
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import org.flowable.bpmn.model.*;
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import org.flowable.bpmn.model.Process;
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import org.flowable.common.engine.api.FlowableException;
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import org.flowable.common.engine.api.delegate.Expression;
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import org.flowable.common.engine.impl.util.io.BytesStreamSource;
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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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import static org.flowable.bpmn.constants.BpmnXMLConstants.FLOWABLE_EXTENSIONS_NAMESPACE;
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import static org.flowable.bpmn.constants.BpmnXMLConstants.FLOWABLE_EXTENSIONS_PREFIX;
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/**
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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. 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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@Slf4j
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public class BpmnModelUtils {
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// ========== BPMN 修改 + 解析元素相关的方法 ==========
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public static void addExtensionElement(FlowElement element, String name, String value) {
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if (value == null) {
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return;
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}
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ExtensionElement extensionElement = new ExtensionElement();
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extensionElement.setNamespace(FLOWABLE_EXTENSIONS_NAMESPACE);
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extensionElement.setNamespacePrefix(FLOWABLE_EXTENSIONS_PREFIX);
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extensionElement.setElementText(value);
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extensionElement.setName(name);
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element.addExtensionElement(extensionElement);
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}
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public static void addExtensionElement(FlowElement element, String name, Integer value) {
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if (value == null) {
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return;
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}
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addExtensionElement(element, name, String.valueOf(value));
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}
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public static void addExtensionElementJson(FlowElement element, String name, Object value) {
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if (value == null) {
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return;
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}
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addExtensionElement(element, name, JsonUtils.toJsonString(value));
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}
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public static void addExtensionElement(FlowElement element, String name, Map<String, String> attributes) {
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if (attributes == null) {
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return;
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}
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ExtensionElement extensionElement = new ExtensionElement();
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extensionElement.setNamespace(FLOWABLE_EXTENSIONS_NAMESPACE);
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extensionElement.setNamespacePrefix(FLOWABLE_EXTENSIONS_PREFIX);
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extensionElement.setName(name);
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attributes.forEach((key, value) -> {
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ExtensionAttribute extensionAttribute = new ExtensionAttribute(key, value);
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extensionElement.addAttribute(extensionAttribute);
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});
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element.addExtensionElement(extensionElement);
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}
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/**
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* 解析扩展元素
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*
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* @param flowElement 节点
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* @param elementName 元素名称
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* @return 扩展元素
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*/
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public static String parseExtensionElement(FlowElement flowElement, String elementName) {
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if (flowElement == null) {
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return null;
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}
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ExtensionElement element = CollUtil.getFirst(flowElement.getExtensionElements().get(elementName));
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return element != null ? element.getElementText() : null;
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}
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/**
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* 给节点添加候选人元素
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*
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* @param candidateStrategy 候选人策略
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* @param candidateParam 候选人参数，允许空
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* @param flowElement 节点
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*/
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public static void addCandidateElements(Integer candidateStrategy, String candidateParam, FlowElement flowElement) {
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addExtensionElement(flowElement, BpmnModelConstants.USER_TASK_CANDIDATE_STRATEGY,
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candidateStrategy == null ? null : candidateStrategy.toString());
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addExtensionElement(flowElement, BpmnModelConstants.USER_TASK_CANDIDATE_PARAM, candidateParam);
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}
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/**
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* 解析候选人策略
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*
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* @param userTask 任务节点
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* @return 候选人策略
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*/
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public static Integer parseCandidateStrategy(FlowElement userTask) {
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Integer candidateStrategy = NumberUtils.parseInt(userTask.getAttributeValue(
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BpmnModelConstants.NAMESPACE, BpmnModelConstants.USER_TASK_CANDIDATE_STRATEGY));
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// TODO @芋艿 尝试从 ExtensionElement 取. 后续相关扩展是否都可以 存 extensionElement。 如表单权限。 按钮权限
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if (candidateStrategy == null) {
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ExtensionElement element = CollUtil.getFirst(userTask.getExtensionElements().get(BpmnModelConstants.USER_TASK_CANDIDATE_STRATEGY));
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candidateStrategy = element != null ? NumberUtils.parseInt(element.getElementText()) : null;
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}
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return candidateStrategy;
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}
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/**
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* 解析候选人参数
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*
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* @param userTask 任务节点
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* @return 候选人参数
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*/
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public static String parseCandidateParam(FlowElement userTask) {
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String candidateParam = userTask.getAttributeValue(
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BpmnModelConstants.NAMESPACE, BpmnModelConstants.USER_TASK_CANDIDATE_PARAM);
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if (candidateParam == null) {
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ExtensionElement element = CollUtil.getFirst(userTask.getExtensionElements().get(BpmnModelConstants.USER_TASK_CANDIDATE_PARAM));
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candidateParam = element != null ? element.getElementText() : null;
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}
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return candidateParam;
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}
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/**
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* 解析审批类型
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*
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* @see BpmUserTaskApproveTypeEnum
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* @param userTask 任务节点
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* @return 审批类型
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*/
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public static Integer parseApproveType(FlowElement userTask) {
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return NumberUtils.parseInt(parseExtensionElement(userTask, BpmnModelConstants.USER_TASK_APPROVE_TYPE));
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}
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/**
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* 解析子流程多实例来源类型
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*
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* @see BpmChildProcessMultiInstanceSourceTypeEnum
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* @param element 任务节点
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* @return 多实例来源类型
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*/
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public static Integer parseMultiInstanceSourceType(FlowElement element) {
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return NumberUtils.parseInt(parseExtensionElement(element, BpmnModelConstants.CHILD_PROCESS_MULTI_INSTANCE_SOURCE_TYPE));
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}
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/**
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* 添加任务拒绝处理元素
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*
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* @param rejectHandler 任务拒绝处理
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* @param userTask 任务节点
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*/
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public static void addTaskRejectElements(BpmSimpleModelNodeVO.RejectHandler rejectHandler, UserTask userTask) {
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if (rejectHandler == null) {
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return;
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}
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addExtensionElement(userTask, USER_TASK_REJECT_HANDLER_TYPE, StrUtil.toStringOrNull(rejectHandler.getType()));
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addExtensionElement(userTask, USER_TASK_REJECT_RETURN_TASK_ID, rejectHandler.getReturnNodeId());
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}
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/**
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* 解析任务拒绝处理类型
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*
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* @param userTask 任务节点
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* @return 任务拒绝处理类型
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*/
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public static BpmUserTaskRejectHandlerTypeEnum parseRejectHandlerType(FlowElement userTask) {
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Integer rejectHandlerType = NumberUtils.parseInt(parseExtensionElement(userTask, USER_TASK_REJECT_HANDLER_TYPE));
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return BpmUserTaskRejectHandlerTypeEnum.typeOf(rejectHandlerType);
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}
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/**
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* 解析任务拒绝返回任务节点 ID
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*
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* @param flowElement 任务节点
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* @return 任务拒绝返回任务节点 ID
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*/
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public static String parseReturnTaskId(FlowElement flowElement) {
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return parseExtensionElement(flowElement, USER_TASK_REJECT_RETURN_TASK_ID);
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}
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/**
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* 给节点添加用户任务的审批人与发起人相同时，处理类型枚举
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*
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* @see BpmUserTaskAssignStartUserHandlerTypeEnum
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* @param assignStartUserHandlerType 发起人处理类型
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* @param userTask 任务节点
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*/
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public static void addAssignStartUserHandlerType(Integer assignStartUserHandlerType, UserTask userTask) {
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if (assignStartUserHandlerType == null) {
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return;
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}
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addExtensionElement(userTask, USER_TASK_ASSIGN_START_USER_HANDLER_TYPE, assignStartUserHandlerType.toString());
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}
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/**
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* 给节点添加用户任务的审批人为空时，处理类型枚举
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*
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* @see BpmUserTaskAssignEmptyHandlerTypeEnum
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* @param emptyHandler 空处理
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* @param userTask 任务节点
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*/
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public static void addAssignEmptyHandlerType(BpmSimpleModelNodeVO.AssignEmptyHandler emptyHandler, UserTask userTask) {
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if (emptyHandler == null) {
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return;
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}
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addExtensionElement(userTask, USER_TASK_ASSIGN_EMPTY_HANDLER_TYPE, StrUtil.toStringOrNull(emptyHandler.getType()));
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addExtensionElement(userTask, USER_TASK_ASSIGN_USER_IDS, StrUtil.join(",", emptyHandler.getUserIds()));
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}
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/**
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* 解析用户任务的审批人与发起人相同时，处理类型枚举
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*
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* @param userTask 任务节点
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* @return 处理类型枚举
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*/
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public static Integer parseAssignStartUserHandlerType(FlowElement userTask) {
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return NumberUtils.parseInt(parseExtensionElement(userTask, USER_TASK_ASSIGN_START_USER_HANDLER_TYPE));
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}
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/**
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* 解析用户任务的审批人为空时，处理类型枚举
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*
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* @param userTask 任务节点
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* @return 处理类型枚举
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*/
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public static Integer parseAssignEmptyHandlerType(FlowElement userTask) {
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return NumberUtils.parseInt(parseExtensionElement(userTask, USER_TASK_ASSIGN_EMPTY_HANDLER_TYPE));
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}
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/**
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* 解析用户任务的审批人为空时，处理用户 ID 数组
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*
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* @param userTask 任务节点
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* @return 处理用户 ID 数组
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*/
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public static List<Long> parseAssignEmptyHandlerUserIds(FlowElement userTask) {
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return StrUtils.splitToLong(parseExtensionElement(userTask, USER_TASK_ASSIGN_USER_IDS), ",");
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}
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/**
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* 给节点添加表单字段权限元素
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*
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* @param fieldsPermissions 表单字段权限
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* @param flowElement 节点
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*/
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public static void addFormFieldsPermission(List<Map<String, String>> fieldsPermissions, FlowElement flowElement) {
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if (CollUtil.isNotEmpty(fieldsPermissions)) {
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fieldsPermissions.forEach(item -> addExtensionElement(flowElement, FORM_FIELD_PERMISSION_ELEMENT, item));
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}
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}
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/**
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* 解析表单字段权限
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*
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* @param bpmnModel bpmnModel 对象
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* @param flowElementId 元素 ID
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* @return 表单字段权限
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*/
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public static Map<String, String> parseFormFieldsPermission(BpmnModel bpmnModel, String flowElementId) {
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if (bpmnModel == null || StrUtil.isEmpty(flowElementId)) {
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return null;
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}
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FlowElement flowElement = getFlowElementById(bpmnModel, flowElementId);
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if (flowElement == null) {
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return null;
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}
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List<ExtensionElement> extensionElements = flowElement.getExtensionElements().get(FORM_FIELD_PERMISSION_ELEMENT);
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if (CollUtil.isEmpty(extensionElements)) {
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return null;
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}
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Map<String, String> fieldsPermission = MapUtil.newHashMap();
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extensionElements.forEach(element -> {
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String field = element.getAttributeValue(null, FORM_FIELD_PERMISSION_ELEMENT_FIELD_ATTRIBUTE);
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String permission = element.getAttributeValue(null, FORM_FIELD_PERMISSION_ELEMENT_PERMISSION_ATTRIBUTE);
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if (StrUtil.isNotEmpty(field) && StrUtil.isNotEmpty(permission)) {
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fieldsPermission.put(field, permission);
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}
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});
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return fieldsPermission;
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}
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/**
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* 给节点添加操作按钮设置元素
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*/
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public static void addButtonsSetting(List<BpmSimpleModelNodeVO.OperationButtonSetting> buttonsSetting, UserTask userTask) {
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if (CollUtil.isNotEmpty(buttonsSetting)) {
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List<Map<String, String>> list = CollectionUtils.convertList(buttonsSetting, item -> {
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Map<String, String> settingMap = Maps.newHashMapWithExpectedSize(3);
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settingMap.put(BUTTON_SETTING_ELEMENT_ID_ATTRIBUTE, String.valueOf(item.getId()));
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settingMap.put(BUTTON_SETTING_ELEMENT_DISPLAY_NAME_ATTRIBUTE, item.getDisplayName());
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settingMap.put(BUTTON_SETTING_ELEMENT_ENABLE_ATTRIBUTE, String.valueOf(item.getEnable()));
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return settingMap;
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});
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list.forEach(item -> addExtensionElement(userTask, BUTTON_SETTING_ELEMENT, item));
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}
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}
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/**
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* 解析操作按钮设置
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*
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* @param bpmnModel bpmnModel 对象
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* @param flowElementId 元素 ID
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* @return 操作按钮设置
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*/
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public static Map<Integer, BpmTaskRespVO.OperationButtonSetting> parseButtonsSetting(BpmnModel bpmnModel, String flowElementId) {
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FlowElement flowElement = getFlowElementById(bpmnModel, flowElementId);
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if (flowElement == null) {
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return null;
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}
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List<ExtensionElement> extensionElements = flowElement.getExtensionElements().get(BUTTON_SETTING_ELEMENT);
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if (CollUtil.isEmpty(extensionElements)) {
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return null;
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}
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Map<Integer, BpmTaskRespVO.OperationButtonSetting> buttonSettings = Maps.newHashMapWithExpectedSize(extensionElements.size());
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extensionElements.forEach(element -> {
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String id = element.getAttributeValue(null, BUTTON_SETTING_ELEMENT_ID_ATTRIBUTE);
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String displayName = element.getAttributeValue(null, BUTTON_SETTING_ELEMENT_DISPLAY_NAME_ATTRIBUTE);
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String enable = element.getAttributeValue(null, BUTTON_SETTING_ELEMENT_ENABLE_ATTRIBUTE);
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if (StrUtil.isNotEmpty(id)) {
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BpmTaskRespVO.OperationButtonSetting setting = new BpmTaskRespVO.OperationButtonSetting();
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buttonSettings.put(Integer.valueOf(id), setting.setDisplayName(displayName).setEnable(Boolean.parseBoolean(enable)));
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}
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});
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return buttonSettings;
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}
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/**
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* 解析边界事件扩展元素
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*
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* @param boundaryEvent 边界事件
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* @param customElement 元素
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* @return 扩展元素
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*/
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public static String parseBoundaryEventExtensionElement(BoundaryEvent boundaryEvent, String customElement) {
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if (boundaryEvent == null) {
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return null;
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}
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ExtensionElement extensionElement = CollUtil.getFirst(boundaryEvent.getExtensionElements().get(customElement));
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return Optional.ofNullable(extensionElement).map(ExtensionElement::getElementText).orElse(null);
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}
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public static void addSignEnable(Boolean signEnable, FlowElement userTask) {
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addExtensionElement(userTask, SIGN_ENABLE,
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ObjUtil.isNotNull(signEnable) ? signEnable.toString() : Boolean.FALSE.toString());
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}
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public static Boolean parseSignEnable(BpmnModel bpmnModel, String flowElementId) {
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FlowElement flowElement = getFlowElementById(bpmnModel, flowElementId);
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if (flowElement == null) {
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return false;
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}
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List<ExtensionElement> extensionElements = flowElement.getExtensionElements().get(SIGN_ENABLE);
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if (CollUtil.isEmpty(extensionElements)) {
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return false;
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}
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return Convert.toBool(extensionElements.get(0).getElementText(), false);
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}
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public static void addReasonRequire(Boolean reasonRequire, FlowElement userTask) {
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addExtensionElement(userTask, REASON_REQUIRE,
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ObjUtil.isNotNull(reasonRequire) ? reasonRequire.toString() : Boolean.FALSE.toString());
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}
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public static Boolean parseReasonRequire(BpmnModel bpmnModel, String flowElementId) {
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FlowElement flowElement = getFlowElementById(bpmnModel, flowElementId);
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if (flowElement == null) {
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return false;
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}
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List<ExtensionElement> extensionElements = flowElement.getExtensionElements().get(REASON_REQUIRE);
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if (CollUtil.isEmpty(extensionElements)) {
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return false;
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}
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return Convert.toBool(extensionElements.get(0).getElementText(), false);
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}
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public static void addListenerConfig(FlowableListener flowableListener, BpmSimpleModelNodeVO.ListenerHandler handler) {
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FieldExtension fieldExtension = new FieldExtension();
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fieldExtension.setFieldName("listenerConfig");
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fieldExtension.setStringValue(JsonUtils.toJsonString(handler));
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flowableListener.getFieldExtensions().add(fieldExtension);
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}
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public static BpmSimpleModelNodeVO.ListenerHandler parseListenerConfig(Expression fixedValue) {
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String expressionText = fixedValue.getExpressionText();
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Assert.notNull(expressionText, "监听器扩展字段({})不能为空", expressionText);
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return JsonUtils.parseObject(expressionText, BpmSimpleModelNodeVO.ListenerHandler.class);
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}
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public static BpmTriggerTypeEnum parserTriggerType(FlowElement flowElement) {
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Integer triggerType = NumberUtils.parseInt(parseExtensionElement(flowElement, TRIGGER_TYPE));
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return BpmTriggerTypeEnum.typeOf(triggerType);
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}
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public static String parserTriggerParam(FlowElement flowElement) {
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return parseExtensionElement(flowElement, TRIGGER_PARAM);
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}
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/**
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* 给节点添加节点类型
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*
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* @param nodeType 节点类型
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* @param flowElement 节点
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*/
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public static void addNodeType(Integer nodeType, FlowElement flowElement) {
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addExtensionElement(flowElement, BpmnModelConstants.NODE_TYPE, nodeType);
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}
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/**
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* 解析节点类型
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*
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* @param flowElement 节点
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* @return 节点类型
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*/
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public static Integer parseNodeType(FlowElement flowElement) {
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return NumberUtils.parseInt(parseExtensionElement(flowElement, BpmnModelConstants.NODE_TYPE));
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}
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// ========== BPM 简单查找相关的方法 ==========
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/**
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* 根据节点，获取入口连线
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*
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* @param source 起始节点
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* @return 入口连线列表
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*/
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public static List<SequenceFlow> getElementIncomingFlows(FlowElement source) {
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if (source instanceof FlowNode) {
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return ((FlowNode) source).getIncomingFlows();
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}
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return new ArrayList<>();
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}
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/**
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* 根据节点，获取出口连线
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*
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* @param source 起始节点
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* @return 出口连线列表
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*/
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public static List<SequenceFlow> getElementOutgoingFlows(FlowElement source) {
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if (source instanceof FlowNode) {
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return ((FlowNode) source).getOutgoingFlows();
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}
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return new ArrayList<>();
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}
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/**
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* 获取流程元素信息
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*
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* @param model bpmnModel 对象
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* @param flowElementId 元素 ID
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* @return 元素信息
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*/
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public static FlowElement getFlowElementById(BpmnModel model, String flowElementId) {
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Process process = model.getMainProcess();
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FlowElement flowElement = process.getFlowElement(flowElementId);
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if (flowElement != null) {
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return flowElement;
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}
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return model.getFlowElement(flowElementId);
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}
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/**
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* 获得 BPMN 流程中，指定的元素们
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*
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* @param model 模型
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* @param clazz 指定元素。例如说，{@link UserTask}、{@link Gateway} 等等
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* @return 元素们
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*/
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@SuppressWarnings("unchecked")
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public static <T extends FlowElement> List<T> getBpmnModelElements(BpmnModel model, Class<T> clazz) {
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List<T> result = new ArrayList<>();
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model.getProcesses().forEach(process -> process.getFlowElements().forEach(flowElement -> {
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if (flowElement.getClass().isAssignableFrom(clazz)) {
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result.add((T) flowElement);
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}
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}));
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return result;
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}
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public static StartEvent getStartEvent(BpmnModel model) {
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Process process = model.getMainProcess();
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// 从 initialFlowElement 找
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FlowElement startElement = process.getInitialFlowElement();
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if (startElement instanceof StartEvent) {
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return (StartEvent) startElement;
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}
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// 从 flowElementList 找
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return (StartEvent) CollUtil.findOne(process.getFlowElements(), flowElement -> flowElement instanceof StartEvent);
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}
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public static EndEvent getEndEvent(BpmnModel model) {
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Process process = model.getMainProcess();
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// 从 flowElementList 找 endEvent
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return (EndEvent) CollUtil.findOne(process.getFlowElements(), flowElement -> flowElement instanceof EndEvent);
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}
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public static BpmnModel getBpmnModel(byte[] bpmnBytes) {
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if (ArrayUtil.isEmpty(bpmnBytes)) {
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return null;
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}
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BpmnXMLConverter converter = new BpmnXMLConverter();
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// 补充说明：由于在 Flowable 中自定义了属性，所以 validateSchema 传递 false
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return converter.convertToBpmnModel(new BytesStreamSource(bpmnBytes), false, false);
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}
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public static String getBpmnXml(BpmnModel model) {
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if (model == null) {
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return null;
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}
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BpmnXMLConverter converter = new BpmnXMLConverter();
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return StrUtil.utf8Str(converter.convertToXML(model));
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}
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public static String getBpmnXml(byte[] bpmnBytes) {
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if (ArrayUtil.isEmpty(bpmnBytes)) {
|
return null;
|
}
|
return StrUtil.utf8Str(bpmnBytes);
|
}
|
|
// ========== BPMN 复杂遍历相关的方法 ==========
|
|
/**
|
* 找到 source 节点之前的所有用户任务节点
|
*
|
* @param source 起始节点
|
* @param hasSequenceFlow 已经经过的连线的 ID，用于判断线路是否重复
|
* @param userTaskList 已找到的用户任务节点
|
* @return 用户任务节点 数组
|
*/
|
public static List<UserTask> getPreviousUserTaskList(FlowElement source, Set<String> hasSequenceFlow, List<UserTask> userTaskList) {
|
userTaskList = userTaskList == null ? new ArrayList<>() : userTaskList;
|
hasSequenceFlow = hasSequenceFlow == null ? new HashSet<>() : hasSequenceFlow;
|
// 如果该节点为开始节点，且存在上级子节点，则顺着上级子节点继续迭代
|
if (source instanceof StartEvent && source.getSubProcess() != null) {
|
userTaskList = getPreviousUserTaskList(source.getSubProcess(), hasSequenceFlow, userTaskList);
|
}
|
|
// 根据类型，获取入口连线
|
List<SequenceFlow> sequenceFlows = getElementIncomingFlows(source);
|
if (sequenceFlows == null) {
|
return userTaskList;
|
}
|
// 循环找到目标元素
|
for (SequenceFlow sequenceFlow : sequenceFlows) {
|
// 如果发现连线重复，说明循环了，跳过这个循环
|
if (hasSequenceFlow.contains(sequenceFlow.getId())) {
|
continue;
|
}
|
// 添加已经走过的连线
|
hasSequenceFlow.add(sequenceFlow.getId());
|
// 类型为用户节点，则新增父级节点
|
if (sequenceFlow.getSourceFlowElement() instanceof UserTask) {
|
userTaskList.add((UserTask) sequenceFlow.getSourceFlowElement());
|
}
|
// 类型为子流程，则添加子流程开始节点出口处相连的节点
|
if (sequenceFlow.getSourceFlowElement() instanceof SubProcess) {
|
// 获取子流程用户任务节点
|
List<UserTask> childUserTaskList = findChildProcessUserTaskList((StartEvent) ((SubProcess) sequenceFlow.getSourceFlowElement()).getFlowElements().toArray()[0], null, null);
|
// 如果找到节点，则说明该线路找到节点，不继续向下找，反之继续
|
if (CollUtil.isNotEmpty(childUserTaskList)) {
|
userTaskList.addAll(childUserTaskList);
|
}
|
}
|
// 继续迭代
|
userTaskList = getPreviousUserTaskList(sequenceFlow.getSourceFlowElement(), hasSequenceFlow, userTaskList);
|
}
|
return userTaskList;
|
}
|
|
/**
|
* 迭代获取子流程用户任务节点
|
*
|
* @param source 起始节点
|
* @param hasSequenceFlow 已经经过的连线的 ID，用于判断线路是否重复
|
* @param userTaskList 需要撤回的用户任务列表
|
* @return 用户任务节点
|
*/
|
public static List<UserTask> findChildProcessUserTaskList(FlowElement source, Set<String> hasSequenceFlow, List<UserTask> userTaskList) {
|
hasSequenceFlow = hasSequenceFlow == null ? new HashSet<>() : hasSequenceFlow;
|
userTaskList = userTaskList == null ? new ArrayList<>() : userTaskList;
|
|
// 根据类型，获取出口连线
|
List<SequenceFlow> sequenceFlows = getElementOutgoingFlows(source);
|
if (sequenceFlows == null) {
|
return userTaskList;
|
}
|
// 循环找到目标元素
|
for (SequenceFlow sequenceFlow : sequenceFlows) {
|
// 如果发现连线重复，说明循环了，跳过这个循环
|
if (hasSequenceFlow.contains(sequenceFlow.getId())) {
|
continue;
|
}
|
// 添加已经走过的连线
|
hasSequenceFlow.add(sequenceFlow.getId());
|
// 如果为用户任务类型，且任务节点的 Key 正在运行的任务中存在，添加
|
if (sequenceFlow.getTargetFlowElement() instanceof UserTask) {
|
userTaskList.add((UserTask) sequenceFlow.getTargetFlowElement());
|
continue;
|
}
|
// 如果节点为子流程节点情况，则从节点中的第一个节点开始获取
|
if (sequenceFlow.getTargetFlowElement() instanceof SubProcess) {
|
List<UserTask> childUserTaskList = findChildProcessUserTaskList((FlowElement) (((SubProcess) sequenceFlow.getTargetFlowElement()).getFlowElements().toArray()[0]), hasSequenceFlow, null);
|
// 如果找到节点，则说明该线路找到节点，不继续向下找，反之继续
|
if (CollUtil.isNotEmpty(childUserTaskList)) {
|
userTaskList.addAll(childUserTaskList);
|
continue;
|
}
|
}
|
// 继续迭代
|
userTaskList = findChildProcessUserTaskList(sequenceFlow.getTargetFlowElement(), hasSequenceFlow, userTaskList);
|
}
|
return userTaskList;
|
}
|
|
/**
|
* 迭代从后向前扫描，判断目标节点相对于当前节点是否是串行
|
* 不存在直接退回到子流程中的情况，但存在从子流程出去到父流程情况
|
*
|
* @param source 起始节点
|
* @param target 目标节点
|
* @param visitedElements 已经经过的连线的 ID，用于判断线路是否重复
|
* @return 结果
|
*/
|
@SuppressWarnings("BooleanMethodIsAlwaysInverted")
|
public static boolean isSequentialReachable(FlowElement source, FlowElement target, Set<String> visitedElements) {
|
visitedElements = visitedElements == null ? new HashSet<>() : visitedElements;
|
// 不能是开始事件和子流程
|
if (source instanceof StartEvent && isInEventSubprocess(source)) {
|
return false;
|
}
|
|
// 根据类型，获取入口连线
|
List<SequenceFlow> sequenceFlows = getElementIncomingFlows(source);
|
// 1. 没有入口连线，则返回 false
|
if (CollUtil.isEmpty(sequenceFlows)) {
|
return false;
|
}
|
// 2. 循环找目标元素, 找到目标节点
|
for (SequenceFlow sequenceFlow : sequenceFlows) {
|
// 如果发现连线重复，说明循环了，跳过这个循环
|
if (visitedElements.contains(sequenceFlow.getId())) {
|
continue;
|
}
|
// 添加已经走过的连线
|
visitedElements.add(sequenceFlow.getId());
|
// 这条线路存在目标节点，直接返回 true
|
FlowElement sourceFlowElement = sequenceFlow.getSourceFlowElement();
|
if (target.getId().equals(sourceFlowElement.getId())) {
|
return true;
|
}
|
// 如果目标节点为并行网关，跳过这个循环 (TODO 疑问：这个判断作用是防止回退到并行网关分支上的节点吗？）
|
if (sourceFlowElement instanceof ParallelGateway) {
|
continue;
|
}
|
// 继续迭代，如果找到目标节点直接返回 true
|
if (isSequentialReachable(sourceFlowElement, target, visitedElements)) {
|
return true;
|
}
|
}
|
// 未找到返回 false
|
return false;
|
}
|
|
/**
|
* 判断当前节点是否属于不同的子流程
|
*
|
* @param flowElement 被判断的节点
|
* @return true 表示属于子流程
|
*/
|
private static boolean isInEventSubprocess(FlowElement flowElement) {
|
FlowElementsContainer flowElementsContainer = flowElement.getParentContainer();
|
while (flowElementsContainer != null) {
|
if (flowElementsContainer instanceof EventSubProcess) {
|
return true;
|
}
|
|
if (flowElementsContainer instanceof FlowElement) {
|
flowElementsContainer = ((FlowElement) flowElementsContainer).getParentContainer();
|
} else {
|
flowElementsContainer = null;
|
}
|
}
|
return false;
|
}
|
|
/**
|
* 根据正在运行的任务节点，迭代获取子级任务节点列表，向后找
|
*
|
* @param source 起始节点
|
* @param runTaskKeyList 正在运行的任务 Key，用于校验任务节点是否是正在运行的节点
|
* @param hasSequenceFlow 已经经过的连线的 ID，用于判断线路是否重复
|
* @param userTaskList 需要撤回的用户任务列表
|
* @return 子级任务节点列表
|
*/
|
public static List<UserTask> iteratorFindChildUserTasks(FlowElement source, List<String> runTaskKeyList,
|
Set<String> hasSequenceFlow, List<UserTask> userTaskList) {
|
hasSequenceFlow = hasSequenceFlow == null ? new HashSet<>() : hasSequenceFlow;
|
userTaskList = userTaskList == null ? new ArrayList<>() : userTaskList;
|
// 如果该节点为开始节点，且存在上级子节点，则顺着上级子节点继续迭代
|
if (source instanceof StartEvent && source.getSubProcess() != null) {
|
userTaskList = iteratorFindChildUserTasks(source.getSubProcess(), runTaskKeyList, hasSequenceFlow, userTaskList);
|
}
|
|
// 根据类型，获取出口连线
|
List<SequenceFlow> sequenceFlows = getElementOutgoingFlows(source);
|
if (sequenceFlows == null) {
|
return userTaskList;
|
}
|
// 循环找到目标元素
|
for (SequenceFlow sequenceFlow : sequenceFlows) {
|
// 如果发现连线重复，说明循环了，跳过这个循环
|
if (hasSequenceFlow.contains(sequenceFlow.getId())) {
|
continue;
|
}
|
// 添加已经走过的连线
|
hasSequenceFlow.add(sequenceFlow.getId());
|
// 如果为用户任务类型，且任务节点的 Key 正在运行的任务中存在，添加
|
if (sequenceFlow.getTargetFlowElement() instanceof UserTask && runTaskKeyList.contains((sequenceFlow.getTargetFlowElement()).getId())) {
|
userTaskList.add((UserTask) sequenceFlow.getTargetFlowElement());
|
continue;
|
}
|
// 如果节点为子流程节点情况，则从节点中的第一个节点开始获取
|
if (sequenceFlow.getTargetFlowElement() instanceof SubProcess) {
|
List<UserTask> childUserTaskList = iteratorFindChildUserTasks((FlowElement) (((SubProcess) sequenceFlow.getTargetFlowElement()).getFlowElements().toArray()[0]), runTaskKeyList, hasSequenceFlow, null);
|
// 如果找到节点，则说明该线路找到节点，不继续向下找，反之继续
|
if (CollUtil.isNotEmpty(childUserTaskList)) {
|
userTaskList.addAll(childUserTaskList);
|
continue;
|
}
|
}
|
// 继续迭代
|
userTaskList = iteratorFindChildUserTasks(sequenceFlow.getTargetFlowElement(), runTaskKeyList, hasSequenceFlow, userTaskList);
|
}
|
return userTaskList;
|
}
|
|
// ========== BPMN 流程预测相关的方法 ==========
|
|
/**
|
* 流程预测，返回 StartEvent、UserTask、ServiceTask、EndEvent 节点元素，最终是 List 串行结果
|
*
|
* @param bpmnModel BPMN 图
|
* @param variables 变量
|
* @return 节点元素数组
|
*/
|
public static List<FlowElement> simulateProcess(BpmnModel bpmnModel, Map<String, Object> variables) {
|
List<FlowElement> resultElements = new ArrayList<>();
|
Set<FlowElement> visitElements = new HashSet<>();
|
|
// 从 StartEvent 开始遍历
|
StartEvent startEvent = getStartEvent(bpmnModel);
|
simulateNextFlowElements(startEvent, variables, resultElements, visitElements);
|
|
// 将 EndEvent 放在末尾。原因是，DFS 遍历，可能 EndEvent 在 resultElements 中
|
List<FlowElement> endEvents = CollUtil.removeWithAddIf(resultElements,
|
flowElement -> flowElement instanceof EndEvent);
|
resultElements.addAll(endEvents);
|
return resultElements;
|
}
|
|
private static void simulateNextFlowElements(FlowElement currentElement, Map<String, Object> variables,
|
List<FlowElement> resultElements, Set<FlowElement> visitElements) {
|
// 如果为空，或者已经遍历过，则直接结束
|
if (currentElement == null) {
|
return;
|
}
|
if (visitElements.contains(currentElement)) {
|
return;
|
}
|
visitElements.add(currentElement);
|
|
// 情况：StartEvent/EndEvent/UserTask/ServiceTask
|
if (currentElement instanceof StartEvent
|
|| currentElement instanceof EndEvent
|
|| currentElement instanceof UserTask
|
|| currentElement instanceof ServiceTask) {
|
// 添加节点
|
FlowNode flowNode = (FlowNode) currentElement;
|
resultElements.add(flowNode);
|
|
// 遍历子节点
|
flowNode.getOutgoingFlows().forEach(
|
nextElement -> simulateNextFlowElements(nextElement.getTargetFlowElement(), variables, resultElements, visitElements));
|
return;
|
}
|
|
// 情况：ExclusiveGateway 排它，只有一个满足条件的。如果没有，就走默认的
|
if (currentElement instanceof ExclusiveGateway) {
|
// 查找满足条件的 SequenceFlow 路径
|
SequenceFlow matchSequenceFlow = findMatchSequenceFlowByExclusiveGateway((Gateway) currentElement, variables);
|
// 遍历满足条件的 SequenceFlow 路径
|
if (matchSequenceFlow != null) {
|
simulateNextFlowElements(matchSequenceFlow.getTargetFlowElement(), variables, resultElements, visitElements);
|
}
|
}
|
// 情况：InclusiveGateway 包容，多个满足条件的。如果没有，就走默认的
|
else if (currentElement instanceof InclusiveGateway) {
|
// 查找满足条件的 SequenceFlow 路径
|
Collection<SequenceFlow> matchSequenceFlows = findMatchSequenceFlowsByInclusiveGateway((Gateway) currentElement, variables);
|
// 遍历满足条件的 SequenceFlow 路径
|
matchSequenceFlows.forEach(
|
flow -> simulateNextFlowElements(flow.getTargetFlowElement(), variables, resultElements, visitElements));
|
}
|
// 情况：ParallelGateway 并行，都满足，都走
|
else if (currentElement instanceof ParallelGateway) {
|
Gateway gateway = (Gateway) currentElement;
|
// 遍历子节点
|
gateway.getOutgoingFlows().forEach(
|
nextElement -> simulateNextFlowElements(nextElement.getTargetFlowElement(), variables, resultElements, visitElements));
|
}
|
}
|
|
/**
|
* 判断是否跳过此节点
|
*
|
* @param flowNode 节点
|
* @param variables 流程变量
|
*/
|
public static boolean isSkipNode(FlowElement flowNode, Map<String, Object> variables) {
|
// 1. 检查节点是否有跳过表达式（支持多种任务节点类型）
|
String skipExpression = null;
|
if (flowNode instanceof UserTask) {
|
skipExpression = ((UserTask) flowNode).getSkipExpression();
|
} else if (flowNode instanceof ServiceTask) {
|
skipExpression = ((ServiceTask) flowNode).getSkipExpression();
|
} else if (flowNode instanceof ScriptTask) {
|
skipExpression = ((ScriptTask) flowNode).getSkipExpression();
|
}
|
|
if (StrUtil.isEmpty(skipExpression)) {
|
return false;
|
}
|
|
// 2. 计算跳过表达式的值
|
return evalConditionExpress(variables, skipExpression);
|
}
|
|
/**
|
* 根据当前节点，获取下一个节点
|
*
|
* @param currentElement 当前节点
|
* @param bpmnModel BPMN模型
|
* @param variables 流程变量
|
*/
|
@SuppressWarnings("PatternVariableCanBeUsed")
|
public static List<FlowNode> getNextFlowNodes(FlowElement currentElement, BpmnModel bpmnModel,
|
Map<String, Object> variables){
|
List<FlowNode> nextFlowNodes = new ArrayList<>(); // 下一个执行的流程节点集合
|
FlowNode currentNode = (FlowNode) currentElement; // 当前执行节点的基本属性
|
List<SequenceFlow> outgoingFlows = currentNode.getOutgoingFlows(); // 当前节点的关联节点
|
if (CollUtil.isEmpty(outgoingFlows)) {
|
log.warn("[getNextFlowNodes][当前节点({}) 的 outgoingFlows 为空]", currentNode.getId());
|
return nextFlowNodes;
|
}
|
|
// 遍历每个出口流
|
for (SequenceFlow outgoingFlow : outgoingFlows) {
|
// 获取目标节点的基本属性
|
FlowElement targetElement = bpmnModel.getFlowElement(outgoingFlow.getTargetRef());
|
if (targetElement == null) {
|
continue;
|
}
|
// 如果是结束节点，直接返回
|
if (targetElement instanceof EndEvent) {
|
break;
|
}
|
// 情况一：处理不同类型的网关
|
if (targetElement instanceof Gateway) {
|
Gateway gateway = (Gateway) targetElement;
|
if (gateway instanceof ExclusiveGateway) {
|
handleExclusiveGateway(gateway, bpmnModel, variables, nextFlowNodes);
|
} else if (gateway instanceof InclusiveGateway) {
|
handleInclusiveGateway(gateway, bpmnModel, variables, nextFlowNodes);
|
} else if (gateway instanceof ParallelGateway) {
|
handleParallelGateway(gateway, bpmnModel, variables, nextFlowNodes);
|
}
|
} else {
|
// 情况二：如果不是网关，直接添加到下一个节点列表
|
nextFlowNodes.add((FlowNode) targetElement);
|
}
|
}
|
return nextFlowNodes;
|
}
|
|
/**
|
* 查找起始节点下一个用户任务列表列表
|
*
|
* @param source 起始节点
|
* @return 结果
|
*/
|
public static List<UserTask> getNextUserTasks(FlowElement source) {
|
return getNextUserTasks(source, null, null);
|
}
|
|
/**
|
* 查找起始节点下一个用户任务列表列表
|
* @param source 起始节点
|
* @param hasSequenceFlow 已经经过的连线的 ID，用于判断线路是否重复
|
* @param userTaskList 用户任务列表
|
* @return 结果
|
*/
|
public static List<UserTask> getNextUserTasks(FlowElement source, Set<String> hasSequenceFlow, List<UserTask> userTaskList) {
|
hasSequenceFlow = Optional.ofNullable(hasSequenceFlow).orElse(new HashSet<>());
|
userTaskList = Optional.ofNullable(userTaskList).orElse(new ArrayList<>());
|
// 获取出口连线
|
List<SequenceFlow> sequenceFlows = getElementOutgoingFlows(source);
|
if (!sequenceFlows.isEmpty()) {
|
for (SequenceFlow sequenceFlow : sequenceFlows) {
|
// 如果发现连线重复，说明循环了，跳过这个循环
|
if (hasSequenceFlow.contains(sequenceFlow.getId())) {
|
continue;
|
}
|
// 添加已经走过的连线
|
hasSequenceFlow.add(sequenceFlow.getId());
|
FlowElement targetFlowElement = sequenceFlow.getTargetFlowElement();
|
if (targetFlowElement instanceof UserTask) {
|
// 若节点为用户任务，加入到结果列表中
|
userTaskList.add((UserTask) targetFlowElement);
|
} else {
|
// 若节点非用户任务，继续递归查找下一个节点
|
getNextUserTasks(targetFlowElement, hasSequenceFlow, userTaskList);
|
}
|
}
|
}
|
return userTaskList;
|
}
|
|
/**
|
* 处理排它网关
|
*
|
* @param gateway 排他网关
|
* @param bpmnModel BPMN模型
|
* @param variables 流程变量
|
* @param nextFlowNodes 下一个执行的流程节点集合
|
*/
|
private static void handleExclusiveGateway(Gateway gateway, BpmnModel bpmnModel,
|
Map<String, Object> variables, List<FlowNode> nextFlowNodes) {
|
// 查找满足条件的 SequenceFlow 路径
|
SequenceFlow matchSequenceFlow = findMatchSequenceFlowByExclusiveGateway(gateway, variables);
|
// 遍历满足条件的 SequenceFlow 路径
|
if (matchSequenceFlow != null) {
|
FlowElement targetElement = bpmnModel.getFlowElement(matchSequenceFlow.getTargetRef());
|
if (targetElement instanceof FlowNode) {
|
nextFlowNodes.add((FlowNode) targetElement);
|
}
|
}
|
}
|
|
/**
|
* 处理排它网关（Exclusive Gateway），选择符合条件的路径
|
*
|
* @param gateway 排他网关
|
* @param variables 流程变量
|
* @return 符合条件的路径
|
*/
|
private static SequenceFlow findMatchSequenceFlowByExclusiveGateway(Gateway gateway, Map<String, Object> variables) {
|
SequenceFlow matchSequenceFlow = CollUtil.findOne(gateway.getOutgoingFlows(),
|
flow -> ObjUtil.notEqual(gateway.getDefaultFlow(), flow.getId())
|
&& (evalConditionExpress(variables, flow.getConditionExpression())));
|
if (matchSequenceFlow == null) {
|
matchSequenceFlow = CollUtil.findOne(gateway.getOutgoingFlows(),
|
flow -> ObjUtil.equal(gateway.getDefaultFlow(), flow.getId()));
|
// 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
|
if (matchSequenceFlow == null && gateway.getOutgoingFlows().size() == 1) {
|
matchSequenceFlow = gateway.getOutgoingFlows().get(0);
|
}
|
}
|
return matchSequenceFlow;
|
}
|
|
/**
|
* 处理包容网关
|
*
|
* @param gateway 排他网关
|
* @param bpmnModel BPMN模型
|
* @param variables 流程变量
|
* @param nextFlowNodes 下一个执行的流程节点集合
|
*/
|
private static void handleInclusiveGateway(Gateway gateway, BpmnModel bpmnModel,
|
Map<String, Object> variables, List<FlowNode> nextFlowNodes) {
|
// 查找满足条件的 SequenceFlow 路径集合
|
Collection<SequenceFlow> matchSequenceFlows = findMatchSequenceFlowsByInclusiveGateway(gateway, variables);
|
// 遍历满足条件的 SequenceFlow 路径，获取目标节点
|
matchSequenceFlows.forEach(flow -> {
|
FlowElement targetElement = bpmnModel.getFlowElement(flow.getTargetRef());
|
if (targetElement instanceof FlowNode) {
|
nextFlowNodes.add((FlowNode) targetElement);
|
}
|
});
|
}
|
|
/**
|
* 处理排它网关（Inclusive Gateway），选择符合条件的路径
|
*
|
* @param gateway 排他网关
|
* @param variables 流程变量
|
* @return 符合条件的路径
|
*/
|
private static Collection<SequenceFlow> findMatchSequenceFlowsByInclusiveGateway(Gateway gateway, Map<String, Object> variables) {
|
// 查找满足条件的 SequenceFlow 路径
|
Collection<SequenceFlow> matchSequenceFlows = CollUtil.filterNew(gateway.getOutgoingFlows(),
|
flow -> ObjUtil.notEqual(gateway.getDefaultFlow(), flow.getId())
|
&& evalConditionExpress(variables, flow.getConditionExpression()));
|
if (CollUtil.isEmpty(matchSequenceFlows)) {
|
matchSequenceFlows = CollUtil.filterNew(gateway.getOutgoingFlows(),
|
flow -> ObjUtil.equal(gateway.getDefaultFlow(), flow.getId()));
|
// 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
|
if (CollUtil.isEmpty(matchSequenceFlows) && gateway.getOutgoingFlows().size() == 1) {
|
matchSequenceFlows = gateway.getOutgoingFlows();
|
}
|
}
|
return matchSequenceFlows;
|
}
|
|
|
/**
|
* 处理并行网关
|
*
|
* @param gateway 排他网关
|
* @param bpmnModel BPMN模型
|
* @param variables 流程变量
|
* @param nextFlowNodes 下一个执行的流程节点集合
|
*/
|
private static void handleParallelGateway(Gateway gateway, BpmnModel bpmnModel,
|
Map<String, Object> variables, List<FlowNode> nextFlowNodes) {
|
// 并行网关，遍历所有出口路径，获取目标节点
|
gateway.getOutgoingFlows().forEach(flow -> {
|
FlowElement targetElement = bpmnModel.getFlowElement(flow.getTargetRef());
|
if (targetElement instanceof FlowNode) {
|
nextFlowNodes.add((FlowNode) targetElement);
|
}
|
});
|
}
|
|
/**
|
* 计算条件表达式是否为 true 满足条件
|
*
|
* @param variables 流程实例
|
* @param expression 条件表达式
|
* @return 是否满足条件
|
*/
|
public static boolean evalConditionExpress(Map<String, Object> variables, String expression) {
|
if (StrUtil.isEmpty(expression)) {
|
return Boolean.FALSE;
|
}
|
// 如果 variables 为空，则创建一个的原因？可能 expression 的计算，不依赖于 variables
|
if (variables == null) {
|
variables = new HashMap<>();
|
}
|
|
// 执行计算
|
try {
|
Object result = FlowableUtils.getExpressionValue(variables, expression);
|
return Boolean.TRUE.equals(result);
|
} catch (FlowableException ex) {
|
// 为什么使用 info 日志？原因是，expression 如果从 variables 取不到值，会报错。实际这种情况下，可以忽略
|
log.info("[evalConditionExpress][条件表达式({}) 变量({}) 解析报错]", expression, variables, ex);
|
return Boolean.FALSE;
|
}
|
}
|
|
@SuppressWarnings("PatternVariableCanBeUsed")
|
public static boolean isSequentialUserTask(FlowElement flowElement) {
|
if (!(flowElement instanceof UserTask)) {
|
return false;
|
}
|
UserTask userTask = (UserTask) flowElement;
|
MultiInstanceLoopCharacteristics loopCharacteristics = userTask.getLoopCharacteristics();
|
return loopCharacteristics != null && loopCharacteristics.isSequential();
|
}
|
|
}
|
