| /** |
| * 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 { Subscription, Subject, Observable, interval, onErrorResumeNext } from 'rxjs'; |
| import { SearchService } from 'app/service/search.service'; |
| import { QueryBuilder } from '../query-builder'; |
| import { SearchResponse } from 'app/model/search-response'; |
| import { switchMap, filter, takeWhile, tap } from 'rxjs/operators'; |
| import { POLLING_DEFAULT_STATE } from 'app/utils/constants'; |
| import { RestError } from 'app/model/rest-error'; |
| import { DialogType } from 'app/shared/metron-dialog/metron-dialog.component'; |
| import { DialogService } from 'app/service/dialog.service'; |
| |
| interface AutoPollingStateModel { |
| isActive: boolean, |
| refreshInterval: number, |
| } |
| |
| @Injectable() |
| export class AutoPollingService { |
| data = new Subject<SearchResponse>(); |
| |
| private isCongestion = false; |
| private refreshInterval = 10; |
| private isPollingActive = POLLING_DEFAULT_STATE; |
| private isPending = false; |
| private isPollingSuppressed = false; |
| private pollingIntervalSubs: Subscription; |
| |
| public readonly AUTO_POLLING_STORAGE_KEY = 'autoPolling'; |
| |
| constructor(private searchService: SearchService, |
| private queryBuilder: QueryBuilder, |
| private dialogService: DialogService, |
| ) { |
| this.restoreState(); |
| } |
| |
| start() { |
| if (!this.isPollingActive) { |
| this.sendInitial(); |
| this.activate(); |
| } |
| this.isPollingActive = true; |
| this.persistState(); |
| } |
| |
| stop(persist = true) { |
| this.isPollingActive = false; |
| if (this.pollingIntervalSubs) { |
| this.pollingIntervalSubs.unsubscribe(); |
| this.pollingIntervalSubs = null; |
| } |
| |
| if (persist) { |
| this.persistState(); |
| } |
| } |
| |
| setSuppression(value: boolean) { |
| this.isPollingSuppressed = value; |
| } |
| |
| dropNextAndContinue() { |
| this.reset(); |
| } |
| |
| setInterval(seconds: number) { |
| this.refreshInterval = seconds; |
| if (this.isPollingActive) { |
| this.reset(); |
| } |
| this.persistState(); |
| } |
| |
| getInterval(): number { |
| return this.refreshInterval; |
| } |
| |
| getIsPollingActive() { |
| return this.isPollingActive; |
| } |
| |
| getIsCongestion() { |
| return this.isCongestion |
| } |
| |
| private sendInitial() { |
| this.isPending = true; |
| this.searchService.search(this.queryBuilder.searchRequest).subscribe(this.onResult.bind(this)); |
| } |
| |
| private persistState(key = this.AUTO_POLLING_STORAGE_KEY): void { |
| localStorage.setItem(key, JSON.stringify(this.getStateModel())); |
| } |
| |
| private restoreState(key = this.AUTO_POLLING_STORAGE_KEY): void { |
| const persistedState = JSON.parse(localStorage.getItem(key)) as AutoPollingStateModel; |
| |
| if (persistedState) { |
| this.refreshInterval = persistedState.refreshInterval; |
| |
| if (persistedState.isActive) { |
| this.start(); |
| } |
| } |
| } |
| |
| private getStateModel(): AutoPollingStateModel { |
| return { |
| isActive: this.isPollingActive, |
| refreshInterval: this.refreshInterval, |
| } |
| } |
| |
| private reset() { |
| if (this.pollingIntervalSubs) { |
| this.pollingIntervalSubs.unsubscribe(); |
| this.isPending = false; |
| } |
| this.activate(); |
| } |
| |
| private activate() { |
| this.pollingIntervalSubs = this.startPolling() |
| .subscribe( |
| this.onResult.bind(this), |
| this.onError.bind(this), |
| ); |
| } |
| |
| private onError(error: RestError) { |
| this.stop(); |
| this.dialogService.launchDialog( |
| 'Server were unable to apply query string. ' + |
| 'Evaluate query string and restart polling.' |
| , DialogType.Error); |
| } |
| |
| private onResult(result: SearchResponse) { |
| this.data.next(result); |
| this.isPending = false; |
| } |
| |
| private startPolling(): Observable<SearchResponse> { |
| return interval(this.refreshInterval * 1000).pipe( |
| tap(() => this.checkCongestionOnTick()), |
| filter(() => !this.isPollingSuppressed && !this.isCongestion), |
| takeWhile(() => this.isPollingActive), |
| switchMap(() => { |
| this.isPending = true; |
| return this.searchService.search(this.queryBuilder.searchRequest); |
| })); |
| } |
| |
| private checkCongestionOnTick() { |
| if (this.isPending) { |
| this.isCongestion = true; |
| } else { |
| this.isCongestion = false; |
| } |
| } |
| |
| onDestroy() { |
| if (this.getIsPollingActive()) { |
| this.stop(false); |
| } |
| } |
| } |