Also rename the sonar project name.

[e-mobility-charging-stations-simulator.git] / src / charging-station / Bootstrap.ts

import Configuration from '../utils/Configuration';
import { StationWorkerData } from '../types/Worker';
import Utils from '../utils/Utils';
import WorkerAbstract from '../worker/WorkerAbstract';
import WorkerFactory from '../worker/WorkerFactory';
import { isMainThread } from 'worker_threads';
import path from 'path';
import { version } from '../../package.json';

export default class Bootstrap {
  private static instance: Bootstrap | null = null;
  private static workerImplementation: WorkerAbstract | null = null;
  private version: string = version;
  private started: boolean;
  private workerScript: string;

  private constructor() {
    this.started = false;
    this.workerScript = path.join(path.resolve(__dirname, '../'), 'charging-station', 'StationWorker.js');
    this.initWorkerImplementation();
    Configuration.setConfigurationChangeCallback(async () => Bootstrap.getInstance().restart());
  }

  public static getInstance(): Bootstrap {
    if (!Bootstrap.instance) {
      Bootstrap.instance = new Bootstrap();
    }
    return Bootstrap.instance;
  }

  public async start(): Promise<void> {
    if (isMainThread && !this.started) {
      try {
        let numStationsTotal = 0;
        await Bootstrap.workerImplementation.start();
        // Start ChargingStation object in worker thread
        if (Configuration.getStationTemplateURLs()) {
          for (const stationURL of Configuration.getStationTemplateURLs()) {
            try {
              const nbStations = stationURL.numberOfStations ? stationURL.numberOfStations : 0;
              for (let index = 1; index <= nbStations; index++) {
                const workerData: StationWorkerData = {
                  index,
                  templateFile: path.join(path.resolve(__dirname, '../'), 'assets', 'station-templates', path.basename(stationURL.file))
                };
                await Bootstrap.workerImplementation.addElement(workerData);
                numStationsTotal++;
              }
            } catch (error) {
              console.error('Charging station start with template file ' + stationURL.file + ' error ', error);
            }
          }
        } else {
          console.log('No stationTemplateURLs defined in configuration, exiting');
        }
        if (numStationsTotal === 0) {
          console.log('No charging station template enabled in configuration, exiting');
        } else {
          console.log(`Charging station simulator ${this.version} started with ${numStationsTotal.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)` : ''}`);
        }
        this.started = true;
      } catch (error) {
        console.error('Bootstrap start error ', error);
      }
    }
  }

  public async stop(): Promise<void> {
    if (isMainThread && this.started) {
      await Bootstrap.workerImplementation.stop();
    }
    this.started = false;
  }

  public async restart(): Promise<void> {
    await this.stop();
    this.initWorkerImplementation();
    await this.start();
  }

  private initWorkerImplementation() {
    Bootstrap.workerImplementation = WorkerFactory.getWorkerImplementation<StationWorkerData>(this.workerScript, Configuration.getWorkerProcess(),
      {
        startDelay: Configuration.getWorkerStartDelay(),
        poolMaxSize: Configuration.getWorkerPoolMaxSize(),
        poolMinSize: Configuration.getWorkerPoolMinSize(),
        elementsPerWorker: Configuration.getChargingStationsPerWorker(),
        poolOptions: {
          workerChoiceStrategy: Configuration.getWorkerPoolStrategy()
        }
      });
    if (!Bootstrap.workerImplementation) {
      throw new Error('Worker implementation not found');
    }
  }
}