Github user sardell commented on a diff in the pull request:
https://github.com/apache/metron/pull/1266#discussion_r234283406
--- Diff:
metron-interface/metron-alerts/src/app/service/app-config.service.ts ---
@@ -0,0 +1,40 @@
+/**
+ * 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 { Injectable } from '@angular/core';
+import { HttpClient } from '@angular/common/http';
+
+@Injectable()
+export class AppConfigService {
+
+ private appConfig;
+
+ constructor(private http: HttpClient) { }
+
+ loadAppConfig() {
--- End diff --
When we convert to a promise, we lose the advantages that come with using
Observables, including it being cancelable. This helps to prevent possible
memory leaks in the browser. Instead of converting to a promise, I think it
would be better to use [rxjs' take
operator](https://www.learnrxjs.io/operators/filtering/take.html). For example:
```
loadAppConfig() {
return this.http.get('assets/app-config.json').pipe(
take(1)
).subscribe(data => {
this.appConfig = data;
});
}
```
---
