loop-modules/utils/trackable-entity.ts

Shared modules for the Loop product suite.

// angular
import { Router, NavigationStart } from '@angular/router';

export abstract class TrackableEntity {

    /**
     * The UTC timestamp the activity started
     *
     * @private
     * @type {number}
     * @memberOf TrackableEntity
     */
    private started_at: number;

    /**
     * The UTC timestamp the activity ended
     *
     * @private
     * @type {number}
     * @memberOf TrackableEntity
     */
    private ended_at: number;

    constructor(public router: Router, public routeUrl: string) {
        if(this.router.routerState.snapshot.url.indexOf(routeUrl) !== -1) {
            this.started_at = Date.now();
        }
        this.router.events.subscribe((event: any) => {
            if(event instanceof NavigationStart) {
                this.ended_at = Date.now();
                if(this.started_at) {
                    this.track(this.started_at, this.ended_at);
                    this.clearTracking();
                }
            }
        });
    }

    /**
     * Tracking function that will be implemented in the extended classes
     *
     * @abstract
     * @param {number} started_at The UTC timestamp the activity started
     * @param {number} ended_at The UTC timestamp the activity ended
     * @returns {*}
     *
     * @memberOf TrackableEntity
     */
    abstract track(started_at: number, ended_at: number): any;

    /**
     * Clears the tracking meta data
     *
     * @private
     *
     * @memberOf TrackableEntity
     */
    private clearTracking() {
        this.started_at = undefined;
        this.ended_at = undefined;
    }

}