[GitHub] [incubator-kyuubi] yanghua commented on a diff in pull request #2840: [KYUUBI #2653] Init frontend framework

[GitBox <gi...@apache.org>]

yanghua commented on code in PR #2840:
URL: https://github.com/apache/incubator-kyuubi/pull/2840#discussion_r941100119


##########
kyuubi-server/web-ui/src/app/services/status.service.ts:
##########
@@ -0,0 +1,76 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { HttpClient } from '@angular/common/http';
+import { Injectable } from '@angular/core';
+import { NavigationEnd, Router } from '@angular/router';
+import { EMPTY, fromEvent, interval, merge, Observable, Subject } from 'rxjs';
+import { debounceTime, filter, map, mapTo, share, startWith, switchMap, tap } from 'rxjs/operators';
+
+import { BASE_URL } from 'config';
+import { Configuration } from 'interfaces';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class StatusService {
+  constructor(private readonly httpClient: HttpClient) {}
+
+  /** Error server response message cache list. */
+  public listOfErrorMessage: string[] = [];
+
+  /** Kyuubi web ui configuration from backend. */
+  public configuration: Configuration;
+
+  public refresh$: Observable<boolean>;
+  private readonly forceRefresh$ = new Subject<boolean>();
+  private readonly visibility$ = fromEvent(window, 'visibilitychange').pipe(map(e => !(e.target as Document).hidden));
+
+  public forceRefresh(): void {
+    this.forceRefresh$.next(true);
+  }
+
+  /**
+   * Create refresh stream when APP_INITIALIZER
+   * refresh interval stream will be regenerated when NavigationEnd || forceRefresh || visibility change
+   *
+   * @param router
+   */
+  public boot(router: Router): Promise<Configuration> {
+    return this.httpClient
+      .get<Configuration>(`${BASE_URL}/api/v1/webui/configuration`)
+      .pipe(
+        tap(data => {
+          alert(data);

Review Comment:
   yes, you are right.



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