src/charging-station/Bootstrap.ts

   1 // Partial Copyright Jerome Benoit. 2021. All Rights Reserved.
   2
   3 import { ChargingStationWorkerData, ChargingStationWorkerMessage, ChargingStationWorkerMessageEvents } from '../types/ChargingStationWorker';
   4
   5 import Configuration from '../utils/Configuration';
   6 import { Storage } from '../performance/storage/Storage';
   7 import { StorageFactory } from '../performance/storage/StorageFactory';
   8 import Utils from '../utils/Utils';
   9 import WorkerAbstract from '../worker/WorkerAbstract';
  10 import WorkerFactory from '../worker/WorkerFactory';
  11 import chalk from 'chalk';
  12 import { isMainThread } from 'worker_threads';
  13 import path from 'path';
  14 import { version } from '../../package.json';
  15
  16 export default class Bootstrap {
  17   private static instance: Bootstrap | null = null;
  18   private static workerImplementation: WorkerAbstract | null = null;
  19   private static storage: Storage;
  20   private static numberOfChargingStations: number;
  21   private version: string = version;
  22   private started: boolean;
  23   private workerScript: string;
  24
  25   private constructor() {
  26     this.started = false;
  27     this.workerScript = path.join(path.resolve(__dirname, '../'), 'charging-station', 'ChargingStationWorker.js');
  28     this.initWorkerImplementation();
  29     Bootstrap.storage = StorageFactory.getStorage(Configuration.getPerformanceStorage().type, Configuration.getPerformanceStorage().URI, this.logPrefix());
  30     Configuration.setConfigurationChangeCallback(async () => Bootstrap.getInstance().restart());
  31   }
  32
  33   public static getInstance(): Bootstrap {
  34     if (!Bootstrap.instance) {
  35       Bootstrap.instance = new Bootstrap();
  36     }
  37     return Bootstrap.instance;
  38   }
  39
  40   public async start(): Promise<void> {
  41     if (isMainThread && !this.started) {
  42       try {
  43         Bootstrap.numberOfChargingStations = 0;
  44         await Bootstrap.storage.open();
  45         await Bootstrap.workerImplementation.start();
  46         // Start ChargingStation object in worker thread
  47         if (Configuration.getStationTemplateURLs()) {
  48           for (const stationURL of Configuration.getStationTemplateURLs()) {
  49             try {
  50               const nbStations = stationURL.numberOfStations ?? 0;
  51               for (let index = 1; index <= nbStations; index++) {
  52                 const workerData: ChargingStationWorkerData = {
  53                   index,
  54                   templateFile: path.join(path.resolve(__dirname, '../'), 'assets', 'station-templates', path.basename(stationURL.file))
  55                 };
  56                 await Bootstrap.workerImplementation.addElement(workerData);
  57                 Bootstrap.numberOfChargingStations++;
  58               }
  59             } catch (error) {
  60               console.error(chalk.red('Charging station start with template file ' + stationURL.file + ' error '), error);
  61             }
  62           }
  63         } else {
  64           console.warn(chalk.yellow('No stationTemplateURLs defined in configuration, exiting'));
  65         }
  66         if (Bootstrap.numberOfChargingStations === 0) {
  67           console.warn(chalk.yellow('No charging station template enabled in configuration, exiting'));
  68         } else {
  69           console.log(chalk.green(`Charging stations simulator ${this.version} started with ${Bootstrap.numberOfChargingStations.toString()} charging station(s) and ${Utils.workerDynamicPoolInUse() ? `${Configuration.getWorkerPoolMinSize().toString()}/` : ''}${Bootstrap.workerImplementation.size}${Utils.workerPoolInUse() ? `/${Configuration.getWorkerPoolMaxSize().toString()}` : ''} worker(s) concurrently running in '${Configuration.getWorkerProcess()}' mode${Bootstrap.workerImplementation.maxElementsPerWorker ? ` (${Bootstrap.workerImplementation.maxElementsPerWorker} charging station(s) per worker)` : ''}`));
  70         }
  71         this.started = true;
  72       } catch (error) {
  73         console.error(chalk.red('Bootstrap start error '), error);
  74       }
  75     } else {
  76       console.error(chalk.red('Cannot start an already started charging stations simulator'));
  77     }
  78   }
  79
  80   public async stop(): Promise<void> {
  81     if (isMainThread && this.started) {
  82       await Bootstrap.workerImplementation.stop();
  83       await Bootstrap.storage.close();
  84     } else {
  85       console.error(chalk.red('Trying to stop the charging stations simulator while not started'));
  86     }
  87     this.started = false;
  88   }
  89
  90   public async restart(): Promise<void> {
  91     await this.stop();
  92     this.initWorkerImplementation();
  93     await this.start();
  94   }
  95
  96   private initWorkerImplementation(): void {
  97     Bootstrap.workerImplementation = WorkerFactory.getWorkerImplementation<ChargingStationWorkerData>(this.workerScript, Configuration.getWorkerProcess(),
  98       {
  99         startDelay: Configuration.getWorkerStartDelay(),
 100         poolMaxSize: Configuration.getWorkerPoolMaxSize(),
 101         poolMinSize: Configuration.getWorkerPoolMinSize(),
 102         elementsPerWorker: Configuration.getChargingStationsPerWorker(),
 103         poolOptions: {
 104           workerChoiceStrategy: Configuration.getWorkerPoolStrategy()
 105         },
 106         messageHandler: async (msg: ChargingStationWorkerMessage) => {
 107           if (msg.id === ChargingStationWorkerMessageEvents.PERFORMANCE_STATISTICS) {
 108             await Bootstrap.storage.storePerformanceStatistics(msg.data);
 109           }
 110         }
 111       });
 112   }
 113
 114   private logPrefix(): string {
 115     return Utils.logPrefix(' Bootstrap |');
 116   }
 117 }