public BuyCurrencyCommandHandler(IAccountRepository accountRepository, IAccountTransactionRepository accountTransactionRepository, ICurrencyExchangeAdapter currencyExchangeAdapter)
 {
     _accountRepository            = accountRepository;
     _accountTransactionRepository = accountTransactionRepository;
     _currencyExchangeAdapter      = currencyExchangeAdapter;
 }
 public GetExchangeRatesQueryHandler(ICurrencyExchangeAdapter currencyExchangeAdapter)
 {
     _currencyExchangeAdapter = currencyExchangeAdapter;
 }