AlertPluginInstanceController verifyGroupName method code optimizatio… (#8920)

* AlertPluginInstanceController verifyGroupName method code optimization #8863
Co-authored-by: Kerwin <37063904+zhuangchong@users.noreply.github.com>

dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/controller/AlertPluginInstanceController.java

@@ -198,16 +198,12 @@ public class AlertPluginInstanceController extends BaseController {
                                   @RequestParam(value = "alertInstanceName") String alertInstanceName) {
 
         boolean exist = alertPluginInstanceService.checkExistPluginInstanceName(alertInstanceName);
-        Result result = new Result();
         if (exist) {
             logger.error("alert plugin instance {} has exist, can't create again.", alertInstanceName);
-            result.setCode(Status.PLUGIN_INSTANCE_ALREADY_EXIT.getCode());
-            result.setMsg(Status.PLUGIN_INSTANCE_ALREADY_EXIT.getMsg());
+            return Result.error(Status.PLUGIN_INSTANCE_ALREADY_EXIT);
         } else {
-            result.setCode(Status.SUCCESS.getCode());
-            result.setMsg(Status.SUCCESS.getMsg());
+            return Result.success();
         }
-        return result;
     }
 
     /**

dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/utils/Result.java

@@ -50,17 +50,18 @@ public class Result<T> {
         this.msg = msg;
     }
 
-    private Result(T data) {
-        this.code = 0;
-        this.data = data;
-    }
-
     private Result(Status status) {
         if (status != null) {
             this.code = status.getCode();
             this.msg = status.getMsg();
         }
     }
+    
+    public Result(Integer code, String msg, T data) {
+        this.code = code;
+        this.msg = msg;
+        this.data = data;
+    }
 
     /**
      * Call this function if there is success
@@ -70,7 +71,11 @@ public class Result<T> {
      * @return resule
      */
     public static <T> Result<T> success(T data) {
-        return new Result<>(data);
+        return new Result<>(Status.SUCCESS.getCode(), Status.SUCCESS.getMsg(), data);
+    }
+    
+    public static Result success() {
+        return success(null);
     }
 
     public boolean isSuccess() {