update 手动合并冲突 优化 工作流模块下一个节点指定办理人、角色和部门转具体用户、抄送人和消息推送,改到通过全局分派监听器和完成监听器处理

update 修复退回申请人无法发送消息问题
This commit is contained in:
songgaoshuai 2025-05-19 11:31:01 +08:00
parent 21c87eee9a
commit 777ae645c5
5 changed files with 102 additions and 180 deletions

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@ -14,7 +14,10 @@ import org.dromara.warm.flow.core.listener.GlobalListener;
import org.dromara.warm.flow.core.listener.ListenerVariable; import org.dromara.warm.flow.core.listener.ListenerVariable;
import org.dromara.warm.flow.orm.entity.FlowTask; import org.dromara.warm.flow.orm.entity.FlowTask;
import org.dromara.workflow.common.ConditionalOnEnable; import org.dromara.workflow.common.ConditionalOnEnable;
import org.dromara.workflow.common.enums.TaskStatusEnum;
import org.dromara.workflow.domain.bo.FlowCopyBo;
import org.dromara.workflow.handler.FlowProcessEventHandler; import org.dromara.workflow.handler.FlowProcessEventHandler;
import org.dromara.workflow.service.IFlwCommonService;
import org.dromara.workflow.service.IFlwInstanceService; import org.dromara.workflow.service.IFlwInstanceService;
import org.dromara.workflow.service.IFlwTaskService; import org.dromara.workflow.service.IFlwTaskService;
import org.springframework.stereotype.Component; import org.springframework.stereotype.Component;
@ -37,6 +40,7 @@ public class WorkflowGlobalListener implements GlobalListener {
private final IFlwTaskService taskService; private final IFlwTaskService taskService;
private final IFlwInstanceService instanceService; private final IFlwInstanceService instanceService;
private final FlowProcessEventHandler flowProcessEventHandler; private final FlowProcessEventHandler flowProcessEventHandler;
private final IFlwCommonService flwCommonService;
/** /**
* 创建监听器任务创建时执行 * 创建监听器任务创建时执行
@ -70,6 +74,32 @@ public class WorkflowGlobalListener implements GlobalListener {
*/ */
@Override @Override
public void assignment(ListenerVariable listenerVariable) { public void assignment(ListenerVariable listenerVariable) {
Map<String, Object> variable = listenerVariable.getVariable();
List<Task> nextTasks = listenerVariable.getNextTasks();
FlowParams flowParams = listenerVariable.getFlowParams();
Definition definition = listenerVariable.getDefinition();
Instance instance = listenerVariable.getInstance();
String applyNodeCode = flwCommonService.applyNodeCode(definition.getId());
for (Task flowTask : nextTasks) {
// 如果办理或者退回并行存在需要指定办理人则直接覆盖办理人
if (variable.containsKey(flowTask.getNodeCode()) && (TaskStatusEnum.PASS.getStatus().equals(flowParams.getHisStatus())
|| TaskStatusEnum.BACK.getStatus().equals(flowParams.getHisStatus()))) {
String userIds = variable.get(flowTask.getNodeCode()).toString();
flowTask.setPermissionList(List.of(userIds.split(StringUtils.SEPARATOR)));
variable.remove(flowTask.getNodeCode());
} else {
// 否则把所有的角色或者部门转成对应的用户
List<String> permissionList = flowTask.getPermissionList();
if (CollUtil.isNotEmpty(permissionList)) {
List<String> newUserList = flwCommonService.buildUser(permissionList);
flowTask.setPermissionList(newUserList);
}
}
// 如果是申请节点则把启动人添加到办理人
if (flowTask.getNodeCode().equals(applyNodeCode)) {
flowTask.setPermissionList(List.of(instance.getCreateBy()));
}
}
} }
/** /**
@ -96,6 +126,27 @@ public class WorkflowGlobalListener implements GlobalListener {
if (StringUtils.isNotBlank(status)) { if (StringUtils.isNotBlank(status)) {
flowProcessEventHandler.processHandler(definition.getFlowCode(), instance, status, params, false); flowProcessEventHandler.processHandler(definition.getFlowCode(), instance, status, params, false);
} }
// 只有办理或者退回的时候才执行消息通知和抄送
if (TaskStatusEnum.PASS.getStatus().equals(flowParams.getHisStatus())
|| TaskStatusEnum.BACK.getStatus().equals(flowParams.getHisStatus())) {
Task task = listenerVariable.getTask();
Map<String, Object> variable = listenerVariable.getVariable();
List<FlowCopyBo> flowCopyList = (List<FlowCopyBo>) variable.get("flowCopyList");
List<String> messageType = (List<String>) variable.get("messageType");
String notice = (String) variable.get("notice");
// 添加抄送人
taskService.setCopy(task, flowCopyList);
variable.remove("flowCopyList");
// 消息通知
if (CollUtil.isNotEmpty(messageType)) {
flwCommonService.sendMessage(definition.getFlowName(), instance.getId(), messageType, notice);
variable.remove("messageType");
variable.remove("notice");
}
}
} }
/** /**

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@ -1,10 +1,6 @@
package org.dromara.workflow.service; package org.dromara.workflow.service;
import org.dromara.warm.flow.core.entity.User;
import org.dromara.warm.flow.core.service.UserService;
import java.util.List; import java.util.List;
import java.util.Set;
/** /**
* 通用 工作流服务 * 通用 工作流服务
@ -13,30 +9,13 @@ import java.util.Set;
*/ */
public interface IFlwCommonService { public interface IFlwCommonService {
/**
* 获取工作流用户service
*
* @return 工作流用户service
*/
UserService getFlowUserService();
/** /**
* 构建工作流用户 * 构建工作流用户
* *
* @param userList 办理用户 * @param permissionList 办理用户
* @param taskId 任务ID
* @return 用户 * @return 用户
*/ */
Set<User> buildUser(List<User> userList, Long taskId); List<String> buildUser(List<String> permissionList);
/**
* 构建工作流用户
*
* @param userIdList 办理用户
* @param taskId 任务ID
* @return 用户
*/
Set<User> buildFlowUser(List<String> userIdList, Long taskId);
/** /**
* 发送消息 * 发送消息

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@ -5,6 +5,7 @@ import org.dromara.common.core.domain.dto.UserDTO;
import org.dromara.common.mybatis.core.page.PageQuery; import org.dromara.common.mybatis.core.page.PageQuery;
import org.dromara.common.mybatis.core.page.TableDataInfo; import org.dromara.common.mybatis.core.page.TableDataInfo;
import org.dromara.warm.flow.core.entity.Node; import org.dromara.warm.flow.core.entity.Node;
import org.dromara.warm.flow.core.entity.Task;
import org.dromara.warm.flow.orm.entity.FlowHisTask; import org.dromara.warm.flow.orm.entity.FlowHisTask;
import org.dromara.warm.flow.orm.entity.FlowNode; import org.dromara.warm.flow.orm.entity.FlowNode;
import org.dromara.warm.flow.orm.entity.FlowTask; import org.dromara.warm.flow.orm.entity.FlowTask;
@ -38,6 +39,14 @@ public interface IFlwTaskService {
*/ */
boolean completeTask(CompleteTaskBo completeTaskBo); boolean completeTask(CompleteTaskBo completeTaskBo);
/**
* 添加抄送人
*
* @param task 任务信息
* @param flowCopyList 抄送人
*/
void setCopy(Task task, List<FlowCopyBo> flowCopyList);
/** /**
* 查询当前用户的待办任务 * 查询当前用户的待办任务
* *

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@ -13,21 +13,18 @@ import org.dromara.common.sse.dto.SseMessageDto;
import org.dromara.common.sse.utils.SseMessageUtils; import org.dromara.common.sse.utils.SseMessageUtils;
import org.dromara.warm.flow.core.entity.Node; import org.dromara.warm.flow.core.entity.Node;
import org.dromara.warm.flow.core.entity.Task; import org.dromara.warm.flow.core.entity.Task;
import org.dromara.warm.flow.core.entity.User;
import org.dromara.warm.flow.core.enums.SkipType; import org.dromara.warm.flow.core.enums.SkipType;
import org.dromara.warm.flow.core.service.NodeService; import org.dromara.warm.flow.core.service.NodeService;
import org.dromara.warm.flow.core.service.UserService;
import org.dromara.warm.flow.orm.entity.FlowTask; import org.dromara.warm.flow.orm.entity.FlowTask;
import org.dromara.warm.flow.orm.entity.FlowUser;
import org.dromara.workflow.common.ConditionalOnEnable; import org.dromara.workflow.common.ConditionalOnEnable;
import org.dromara.workflow.common.enums.MessageTypeEnum; import org.dromara.workflow.common.enums.MessageTypeEnum;
import org.dromara.workflow.common.enums.TaskAssigneeType;
import org.dromara.workflow.service.IFlwCommonService; import org.dromara.workflow.service.IFlwCommonService;
import org.dromara.workflow.service.IFlwTaskAssigneeService; import org.dromara.workflow.service.IFlwTaskAssigneeService;
import org.dromara.workflow.service.IFlwTaskService; import org.dromara.workflow.service.IFlwTaskService;
import org.springframework.stereotype.Service; import org.springframework.stereotype.Service;
import java.util.*; import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors; import java.util.stream.Collectors;
@ -41,82 +38,27 @@ import java.util.stream.Collectors;
@RequiredArgsConstructor @RequiredArgsConstructor
@Service @Service
public class FlwCommonServiceImpl implements IFlwCommonService { public class FlwCommonServiceImpl implements IFlwCommonService {
private final UserService userService;
private final NodeService nodeService; private final NodeService nodeService;
/**
* 获取工作流用户service
*/
@Override
public UserService getFlowUserService() {
return userService;
}
/** /**
* 构建工作流用户 * 构建工作流用户
* *
* @param userList 办理用户 * @param permissionList 办理用户
* @param taskId 任务ID
* @return 用户 * @return 用户
*/ */
@Override @Override
public Set<User> buildUser(List<User> userList, Long taskId) { public List<String> buildUser(List<String> permissionList) {
if (CollUtil.isEmpty(userList)) { if (CollUtil.isEmpty(permissionList)) {
return Set.of(); return List.of();
} }
Set<User> list = new HashSet<>();
Set<String> processedBySet = new HashSet<>();
IFlwTaskAssigneeService taskAssigneeService = SpringUtils.getBean(IFlwTaskAssigneeService.class); IFlwTaskAssigneeService taskAssigneeService = SpringUtils.getBean(IFlwTaskAssigneeService.class);
Map<String, List<User>> userListMap = StreamUtils.groupByKey(userList, User::getType); String processedBys = CollUtil.join(permissionList, StringUtils.SEPARATOR);
for (Map.Entry<String, List<User>> entry : userListMap.entrySet()) {
List<User> entryValue = entry.getValue();
String processedBys = StreamUtils.join(entryValue, User::getProcessedBy);
// 根据 processedBy 前缀判断处理人类型分别获取用户列表 // 根据 processedBy 前缀判断处理人类型分别获取用户列表
List<UserDTO> users = taskAssigneeService.fetchUsersByStorageIds(processedBys); List<UserDTO> users = taskAssigneeService.fetchUsersByStorageIds(processedBys);
// 转换为 FlowUser 并添加到结果集合
if (CollUtil.isNotEmpty(users)) { return StreamUtils.toList(users, userDTO -> String.valueOf(userDTO.getUserId()));
users.forEach(dto -> {
String processedBy = String.valueOf(dto.getUserId());
if (!processedBySet.contains(processedBy)) {
FlowUser flowUser = new FlowUser();
flowUser.setType(entry.getKey());
flowUser.setProcessedBy(processedBy);
flowUser.setAssociated(taskId);
list.add(flowUser);
processedBySet.add(processedBy);
}
});
}
}
return list;
} }
/**
* 构建工作流用户
*
* @param userIdList 办理用户
* @param taskId 任务ID
* @return 用户
*/
@Override
public Set<User> buildFlowUser(List<String> userIdList, Long taskId) {
if (CollUtil.isEmpty(userIdList)) {
return Set.of();
}
Set<User> list = new HashSet<>();
Set<String> processedBySet = new HashSet<>();
for (String userId : userIdList) {
if (!processedBySet.contains(userId)) {
FlowUser flowUser = new FlowUser();
flowUser.setType(TaskAssigneeType.APPROVER.getCode());
flowUser.setProcessedBy(String.valueOf(userId));
flowUser.setAssociated(taskId);
list.add(flowUser);
processedBySet.add(String.valueOf(userId));
}
}
return list;
}
/** /**
* 发送消息 * 发送消息

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@ -25,6 +25,7 @@ import org.dromara.common.core.validate.EditGroup;
import org.dromara.common.mybatis.core.page.PageQuery; import org.dromara.common.mybatis.core.page.PageQuery;
import org.dromara.common.mybatis.core.page.TableDataInfo; import org.dromara.common.mybatis.core.page.TableDataInfo;
import org.dromara.common.satoken.utils.LoginHelper; import org.dromara.common.satoken.utils.LoginHelper;
import org.dromara.warm.flow.core.FlowEngine;
import org.dromara.warm.flow.core.dto.FlowParams; import org.dromara.warm.flow.core.dto.FlowParams;
import org.dromara.warm.flow.core.entity.*; import org.dromara.warm.flow.core.entity.*;
import org.dromara.warm.flow.core.enums.NodeType; import org.dromara.warm.flow.core.enums.NodeType;
@ -155,6 +156,14 @@ public class FlwTaskServiceImpl implements IFlwTaskService {
String notice = completeTaskBo.getNotice(); String notice = completeTaskBo.getNotice();
// 获取抄送人 // 获取抄送人
List<FlowCopyBo> flowCopyList = completeTaskBo.getFlowCopyList(); List<FlowCopyBo> flowCopyList = completeTaskBo.getFlowCopyList();
// 设置抄送人
completeTaskBo.getVariables().put("flowCopyList", flowCopyList);
// 消息类型
completeTaskBo.getVariables().put("messageType", messageType);
// 消息通知
completeTaskBo.getVariables().put("notice", notice);
FlowTask flowTask = flowTaskMapper.selectById(taskId); FlowTask flowTask = flowTaskMapper.selectById(taskId);
if (ObjectUtil.isNull(flowTask)) { if (ObjectUtil.isNull(flowTask)) {
throw new ServiceException("流程任务不存在或任务已审批!"); throw new ServiceException("流程任务不存在或任务已审批!");
@ -180,12 +189,7 @@ public class FlwTaskServiceImpl implements IFlwTaskService {
.hisStatus(TaskStatusEnum.PASS.getStatus()) .hisStatus(TaskStatusEnum.PASS.getStatus())
.hisTaskExt(completeTaskBo.getFileId()); .hisTaskExt(completeTaskBo.getFileId());
// 执行任务跳转并根据返回的处理人设置下一步处理人 // 执行任务跳转并根据返回的处理人设置下一步处理人
Instance instance = taskService.skip(taskId, flowParams); taskService.skip(taskId, flowParams);
this.setHandler(instance, flowTask, flowCopyList);
// 消息通知
flwCommonService.sendMessage(definition.getFlowName(), ins.getId(), messageType, notice);
//设置下一环节处理人
setNextHandler(ins.getId(), completeTaskBo.getAssigneeMap());
return true; return true;
} catch (Exception e) { } catch (Exception e) {
log.error(e.getMessage(), e); log.error(e.getMessage(), e);
@ -193,33 +197,6 @@ public class FlwTaskServiceImpl implements IFlwTaskService {
} }
} }
/**
* 设置下一环节处理人
*
* @param instanceId 实例ID
* @param assigneeMap 办理人
*/
private void setNextHandler(Long instanceId, Map<String, Object> assigneeMap) {
if (CollUtil.isEmpty(assigneeMap)) {
return;
}
Instance inst = insService.getById(instanceId);
List<FlowTask> flowTaskList = selectByInstId(instanceId);
Map<String, Object> variableMap = inst.getVariableMap();
for (FlowTask task : flowTaskList) {
if (variableMap != null && variableMap.containsKey(task.getNodeCode())) {
String userIds = variableMap.get(task.getNodeCode()).toString();
// 批量删除现有任务的办理人记录
flwCommonService.getFlowUserService().deleteByTaskIds(List.of(task.getId()));
// 批量新增任务办理人记录
Set<User> users = flwCommonService.buildFlowUser(List.of(userIds.split(StringUtils.SEPARATOR)), task.getId());
flwCommonService.getFlowUserService().saveBatch(new ArrayList<>(users));
variableMap.remove(task.getNodeCode());
}
}
taskService.mergeVariable(inst, variableMap);
}
/** /**
* 设置弹窗处理人 * 设置弹窗处理人
* *
@ -251,54 +228,14 @@ public class FlwTaskServiceImpl implements IFlwTaskService {
return map; return map;
} }
/**
* 设置办理人
*
* @param instance 实例
* @param task (当前任务)未办理的任务
* @param flowCopyList 抄送人
*/
private void setHandler(Instance instance, FlowTask task, List<FlowCopyBo> flowCopyList) {
if (ObjectUtil.isNull(instance)) {
return;
}
// 添加抄送人
this.setCopy(task, flowCopyList);
// 根据流程实例ID查询所有关联的任务
List<FlowTask> flowTasks = this.selectByInstId(instance.getId());
if (CollUtil.isEmpty(flowTasks)) {
return;
}
List<Long> taskIdList = StreamUtils.toList(flowTasks, FlowTask::getId);
// 获取与当前任务关联的用户列表
List<User> associatedUsers = flwCommonService.getFlowUserService().getByAssociateds(taskIdList);
if (CollUtil.isEmpty(associatedUsers)) {
return;
}
List<User> userList = new ArrayList<>();
// 遍历任务列表处理每个任务的办理人
for (FlowTask flowTask : flowTasks) {
List<User> users = StreamUtils.filter(associatedUsers, user -> Objects.equals(user.getAssociated(), flowTask.getId()));
if (CollUtil.isNotEmpty(users)) {
userList.addAll(flwCommonService.buildUser(users, flowTask.getId()));
}
}
// 批量删除现有任务的办理人记录
flwCommonService.getFlowUserService().deleteByTaskIds(taskIdList);
// 确保要保存的 userList 不为空
if (CollUtil.isEmpty(userList)) {
return;
}
flwCommonService.getFlowUserService().saveBatch(userList);
}
/** /**
* 添加抄送人 * 添加抄送人
* *
* @param task 任务信息 * @param task 任务信息
* @param flowCopyList 抄送人 * @param flowCopyList 抄送人
*/ */
public void setCopy(FlowTask task, List<FlowCopyBo> flowCopyList) { @Override
public void setCopy(Task task, List<FlowCopyBo> flowCopyList) {
if (CollUtil.isEmpty(flowCopyList)) { if (CollUtil.isEmpty(flowCopyList)) {
return; return;
} }
@ -329,7 +266,7 @@ public class FlwTaskServiceImpl implements IFlwTaskService {
return flowUser; return flowUser;
}).collect(Collectors.toList()); }).collect(Collectors.toList());
// 批量保存抄送人员 // 批量保存抄送人员
flwCommonService.getFlowUserService().saveBatch(userList); FlowEngine.userService().saveBatch(userList);
} }
/** /**
@ -456,21 +393,25 @@ public class FlwTaskServiceImpl implements IFlwTaskService {
Instance inst = insService.getById(task.getInstanceId()); Instance inst = insService.getById(task.getInstanceId());
BusinessStatusEnum.checkBackStatus(inst.getFlowStatus()); BusinessStatusEnum.checkBackStatus(inst.getFlowStatus());
Long definitionId = task.getDefinitionId(); Long definitionId = task.getDefinitionId();
Definition definition = defService.getById(definitionId);
String applyNodeCode = flwCommonService.applyNodeCode(definitionId); String applyNodeCode = flwCommonService.applyNodeCode(definitionId);
Map<String, Object> variable = new HashMap<>();
// 设置抄送人
variable.put("flowCopyList", bo.getMessageType());
// 消息类型
variable.put("messageType", messageType);
// 消息通知
variable.put("notice", notice);
FlowParams flowParams = FlowParams.build() FlowParams flowParams = FlowParams.build()
.nodeCode(bo.getNodeCode()) .nodeCode(bo.getNodeCode())
.variable(variable)
.message(message) .message(message)
.skipType(SkipType.REJECT.getKey()) .skipType(SkipType.REJECT.getKey())
.flowStatus(applyNodeCode.equals(bo.getNodeCode()) ? TaskStatusEnum.BACK.getStatus() : TaskStatusEnum.WAITING.getStatus()) .flowStatus(applyNodeCode.equals(bo.getNodeCode()) ? TaskStatusEnum.BACK.getStatus() : TaskStatusEnum.WAITING.getStatus())
.hisStatus(TaskStatusEnum.BACK.getStatus()) .hisStatus(TaskStatusEnum.BACK.getStatus())
.hisTaskExt(bo.getFileId()); .hisTaskExt(bo.getFileId());
taskService.skip(task.getId(), flowParams); taskService.skip(task.getId(), flowParams);
Instance instance = insService.getById(inst.getId());
this.setHandler(instance, task, null);
// 消息通知
flwCommonService.sendMessage(definition.getFlowName(), instance.getId(), messageType, notice);
return true; return true;
} catch (Exception e) { } catch (Exception e) {
log.error(e.getMessage(), e); log.error(e.getMessage(), e);
@ -745,7 +686,7 @@ public class FlwTaskServiceImpl implements IFlwTaskService {
List<FlowTask> flowTasks = this.selectByIdList(taskIdList); List<FlowTask> flowTasks = this.selectByIdList(taskIdList);
// 批量删除现有任务的办理人记录 // 批量删除现有任务的办理人记录
if (CollUtil.isNotEmpty(flowTasks)) { if (CollUtil.isNotEmpty(flowTasks)) {
flwCommonService.getFlowUserService().deleteByTaskIds(StreamUtils.toList(flowTasks, FlowTask::getId)); FlowEngine.userService().deleteByTaskIds(StreamUtils.toList(flowTasks, FlowTask::getId));
List<User> userList = flowTasks.stream() List<User> userList = flowTasks.stream()
.map(flowTask -> { .map(flowTask -> {
FlowUser flowUser = new FlowUser(); FlowUser flowUser = new FlowUser();
@ -756,7 +697,7 @@ public class FlwTaskServiceImpl implements IFlwTaskService {
}) })
.collect(Collectors.toList()); .collect(Collectors.toList());
if (CollUtil.isNotEmpty(userList)) { if (CollUtil.isNotEmpty(userList)) {
flwCommonService.getFlowUserService().saveBatch(userList); FlowEngine.userService().saveBatch(userList);
} }
} }
} catch (Exception e) { } catch (Exception e) {
@ -775,13 +716,13 @@ public class FlwTaskServiceImpl implements IFlwTaskService {
public Map<Long, List<UserDTO>> currentTaskAllUser(List<Long> taskIdList) { public Map<Long, List<UserDTO>> currentTaskAllUser(List<Long> taskIdList) {
Map<Long, List<UserDTO>> map = new HashMap<>(); Map<Long, List<UserDTO>> map = new HashMap<>();
// 获取与当前任务关联的用户列表 // 获取与当前任务关联的用户列表
List<User> associatedUsers = flwCommonService.getFlowUserService().getByAssociateds(taskIdList); List<User> associatedUsers = FlowEngine.userService().getByAssociateds(taskIdList);
Map<Long, List<User>> listMap = StreamUtils.groupByKey(associatedUsers, User::getAssociated); Map<Long, List<User>> listMap = StreamUtils.groupByKey(associatedUsers, User::getAssociated);
for (Map.Entry<Long, List<User>> entry : listMap.entrySet()) { for (Map.Entry<Long, List<User>> entry : listMap.entrySet()) {
List<User> value = entry.getValue(); List<User> value = entry.getValue();
if (CollUtil.isNotEmpty(value)) { if (CollUtil.isNotEmpty(value)) {
List<UserDTO> userDTOS = userService.selectListByIds(StreamUtils.toList(value, e -> Long.valueOf(e.getProcessedBy()))); List<UserDTO> userDtoList = userService.selectListByIds(StreamUtils.toList(value, e -> Long.valueOf(e.getProcessedBy())));
map.put(entry.getKey(), userDTOS); map.put(entry.getKey(), userDtoList);
} }
} }
return map; return map;
@ -795,7 +736,7 @@ public class FlwTaskServiceImpl implements IFlwTaskService {
@Override @Override
public List<UserDTO> currentTaskAllUser(Long taskId) { public List<UserDTO> currentTaskAllUser(Long taskId) {
// 获取与当前任务关联的用户列表 // 获取与当前任务关联的用户列表
List<User> userList = flwCommonService.getFlowUserService().getByAssociateds(Collections.singletonList(taskId)); List<User> userList = FlowEngine.userService().getByAssociateds(Collections.singletonList(taskId));
if (CollUtil.isEmpty(userList)) { if (CollUtil.isEmpty(userList)) {
return Collections.emptyList(); return Collections.emptyList();
} }