---

public setInstrument(
  symbol: string,
  symbolName: string,
  options?: SetWithHistoryOptions,
): void {
  this.setWithHistory('symbol', this.symbol$, symbol, options);
  this.symbolName$.next(symbolName);
}

public symbolName(): Observable<string> {
  return this.symbolName$.asObservable();
}

public getSymbolName(): string {
  return this.symbolName$.value;
}