[fix-3843][api] When update workflow definition,if name already exists, the prompt is not friendly

dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/enums/Status.java

@@ -133,7 +133,7 @@ public enum Status {
     QUERY_TASK_INSTANCE_LOG_ERROR(10103, "view task instance log error", "查询任务实例日志错误"),
     DOWNLOAD_TASK_INSTANCE_LOG_FILE_ERROR(10104, "download task instance log file error", "下载任务日志文件错误"),
     CREATE_PROCESS_DEFINITION(10105, "create process definition", "创建工作流错误"),
-    VERIFY_PROCESS_DEFINITION_NAME_UNIQUE_ERROR(10106, "verify process definition name unique error", "工作流名称已存在"),
+    VERIFY_PROCESS_DEFINITION_NAME_UNIQUE_ERROR(10106, "verify process definition name unique error", "工作流定义名称已存在"),
     UPDATE_PROCESS_DEFINITION_ERROR(10107, "update process definition error", "更新工作流定义错误"),
     RELEASE_PROCESS_DEFINITION_ERROR(10108, "release process definition error", "上线工作流错误"),
     QUERY_DATAIL_OF_PROCESS_DEFINITION_ERROR(10109, "query datail of process definition error", "查询工作流详细信息错误"),

dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/service/impl/ProcessDefinitionServiceImpl.java

@@ -366,16 +366,24 @@ public class ProcessDefinitionServiceImpl extends BaseService implements
             return checkProcessJson;
         }
         ProcessDefinition processDefine = processService.findProcessDefineById(id);
+        // check process definition exists
         if (processDefine == null) {
-            // check process definition exists
             putMsg(result, Status.PROCESS_DEFINE_NOT_EXIST, id);
             return result;
-        } else if (processDefine.getReleaseState() == ReleaseState.ONLINE) {
+        }
+        if (processDefine.getReleaseState() == ReleaseState.ONLINE) {
             // online can not permit edit
             putMsg(result, Status.PROCESS_DEFINE_NOT_ALLOWED_EDIT, processDefine.getName());
             return result;
-        } else {
+        }
-            putMsg(result, Status.SUCCESS);
+
+        if (!name.equals(processDefine.getName())) {
+            // check whether the new process define name exist
+            ProcessDefinition definition = processDefineMapper.verifyByDefineName(project.getId(), name);
+            if (definition != null) {
+                putMsg(result, Status.VERIFY_PROCESS_DEFINITION_NAME_UNIQUE_ERROR, name);
+                return result;
+            }
         }
 
         Date now = new Date();