class ShutdownService {
  private static closeCallbacks: (() => void)[] = [];

  static addShutdownListener(close: () => void) {
    this.closeCallbacks.push(close);
  }

  static initShutdownHook(): void {
    process.on("SIGINT", () => {
      this.closeCallbacks.forEach((close: () => void) => close());
      process.exit(1);
    });
    process.on("SIGTERM", () => {
      this.closeCallbacks.forEach((close: () => void) => close());
      process.exit(1);
    });
  }
}

export default ShutdownService;