Method setupShutdown

packages/core/src/application.ts:586–619

* Set up signals that are captured to shutdown the application

()

   * Set up signals that are captured to shutdown the application
   */
  protected setupShutdown() {
    if (this._signalListener != null) {
      this.registerSignalListener();
      return this._signalListener;
    }
    const gracePeriod = this._shutdownOptions.gracePeriod;
    this._signalListener = async (signal: string) => {
      const kill = () => {
        this.removeSignalListener();
        process.kill(process.pid, signal);
      };
      debugShutdown(
        '[%s] Signal %s received for process %d',
        this.name,
        signal,
        process.pid,
      );
      if (!this._isShuttingDown) {
        this._isShuttingDown = true;
        let timer;
        if (typeof gracePeriod === 'number' && !isNaN(gracePeriod)) {
          timer = setTimeout(kill, gracePeriod);
        }
        try {
          await this.stop();
        } finally {
          if (timer != null) clearTimeout(timer);
          kill();
        }
      }
    };
    this.registerSignalListener();
    return this._signalListener;
  }

  private registerSignalListener() {
    const {signals = []} = this._shutdownOptions;