src/app/ui/main/main.component.ts

/*
 * 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 {Component, OnDestroy, OnInit} from '@angular/core'
import {NlpProbe} from '../../services/nlp/nlp.model'
import {NlpService} from '../../services/nlp/nlp.service'

@Component({
    selector: 'app-main',
    templateUrl: './main.component.html',
    styleUrls: ['./main.component.css']
})
export class MainComponent implements OnInit, OnDestroy {
    private _error: any;

    private _loading = false;

    private _allProbes: NlpProbe[];

    private _timer: number;

    constructor(
        private _nlp: NlpService
    ) {
        // No-op.
    }

    get error(): any {
        return this._error
    }

    get loading(): boolean {
        return this._loading
    }

    get hasProbes(): boolean {
        return this._allProbes && this._allProbes.length > 0
    }

    get allProbes(): NlpProbe[] {
        return this._allProbes
    }

    async ngOnInit() {
        this._timer = setInterval(async () => {
            await this.loadProbes()
        }, 1000);

        try {
            this._loading = true;

            await this.loadProbes()
        } finally {
            this._loading = false
        }
    }

    ngOnDestroy(): void {
        clearInterval(this._timer)
    }

    private async loadProbes() {
        try {
            this._allProbes = (await this._nlp.allProbes().toPromise()).probes;

            if (!this.hasProbes) {
                this._error = 'No NLPCraft Probe to talk to :('
            } else {
                this._error = null
            }
        } catch (e) {
            this._allProbes = null;

            this._error = e
        }
    }
}