/// <summary>Handles a request</summary>
/// <param name="request">The request</param>
/// <param name="cancellationToken">Cancellation token</param>
/// <returns>Response from the request</returns>
public async Task <Unit> Handle(DownloadRatesRequest request, CancellationToken cancellationToken)
{
// Some operations with IEmailService and IProfileService
// Update database with new rates
// using UnitOfWork instance (_unitOfWork)
// EXAMPLE:
// ----------------------------------------------------------------------------
// await _unitOfWork.SaveChangesAsync();
// if (!_unitOfWork.LastSaveChangesResult.IsOk)
// {
// await _workService.WorkFailedAsync(cancellationToken, request.WorkId, _unitOfWork.LastSaveChangesResult.Exception);
// return Unit.Value;
// // ---------------- OR --------------------------
// await _workService.RestartWorkAsync(request.WorkId, _unitOfWork.LastSaveChangesResult.Exception.Message);
// return Unit.Value;
// }
// Finishing the work
await _workService.CompleteWorkAsync(cancellationToken, request.WorkId, "Updated from Bank of Russia");
// append work for rates generation
await _worker.AppendWorkPriceCalculationAsync(cancellationToken);
// return
return(Unit.Value);
}