import { Observable } from "babylonjs/Misc/observable" ; import { Engine } from "babylonjs/Engines/engine" ; /**
 * The data structure of a telemetry event.
 */ export interface TelemetryData { event : string ; session : string ; date : Date ; now : number ; viewerId ? : string ; detail : any ; } /**
 * Receives Telemetry events and raises events to the API
 */ export class TelemetryManager { public onEventBroadcastedObservable : Observable < TelemetryData > = new Observable ( ) ; private _currentSessionId : string ; private _event : ( event : string , viewerId ? : string , details ? : any ) => void = this . _eventEnabled ; param event param details public get broadcast ( ) { return this . _event ; } param engine public flushWebGLErrors ( engine , viewerId ? ) { if ( ! engine ) { return ; } let logErrors = true ; while ( logErrors ) { let error = engine . getError ( ) ; if ( error === 0 ) { logErrors = false ; } else { this . broadcast ( "WebGL Error" , viewerId , { error : error } ) ; } } } param enabled public set enable ( enabled ) { if ( enabled ) { this . _event = this . _eventEnabled ; } else { this . _event = this . _eventDisabled ; } } /**
     * Called on event when disabled, typically do nothing here
     */ private _eventDisabled ( ) { } param event param details private _eventEnabled ( event , viewerId ? , details ? ) { let telemetryData = { viewerId , event : event , session : this . session , date : new Date ( ) , now : window . performance ? window . performance . now ( ) : Date . now ( ) , detail : null } ; if ( typeof details === "object" ) { for ( var attr in details ) { if ( details . hasOwnProperty ( attr ) ) { telemetryData [ attr ] = details [ attr ] ; } } } else if ( details ) { telemetryData . detail = details ; } this . onEventBroadcastedObservable . notifyObservers ( telemetryData ) ; } return public get session ( ) : string { if ( ! this . _currentSessionId ) { this . _currentSessionId = "SESSION_" + Date . now ( ) + Math . floor ( Math . random ( ) * 0x10000 ) ; } return this . _currentSessionId ; } /**
     * Disposes the telemetry manager
     */ public dispose ( ) { this . onEventBroadcastedObservable . clear ( ) ; } } export const telemetryManager = new TelemetryManager ( ) ;