/// <summary>
/// To Fetch And Add New Symbols
/// </summary>
/// <returns>Success or Fails (True or False)</returns>
public bool FetchAndAddNewSymbols()
{
CurrencyExchangeEntities currencyExchangeEntities = new CurrencyExchangeEntities();
List <string> symbols = new List <string>();
List <string> newSymbols = new List <string>();
try
{
List <string> existingCurrencySymbols = currencyExchangeEntities.Currencies.Select(x => x.Code.Trim().ToUpper()).ToList();
//Fetching symbols from all new resource types
foreach (iDataResource dataSource in _dataSources)
{
symbols.AddRange(dataSource.FetchNewSymbols());
}
if (symbols.Count() > 0)
{
if (existingCurrencySymbols.Count > 0)
{
//Fetching Distinct symbols from resources as well as symbols not in DB already
newSymbols = symbols.Distinct().Except(existingCurrencySymbols).ToList();
}
else
{
//Fetching Distinct symbols from resources
newSymbols = symbols.Distinct().ToList();
}
if (newSymbols.Count() > 0)
{
//Add all the symbols into currency table
foreach (var symbol in newSymbols)
{
Currency currency = new Currency();
currency.Code = symbol.Trim().ToUpper();
currencyExchangeEntities.Currencies.Add(currency);//DB
}
var dataSources = currencyExchangeEntities.DataSources;
//Marking all the datasources as not new
foreach (var dataSource in dataSources)
{
dataSource.IsNew = false; //DB
}
currencyExchangeEntities.SaveChanges(); //DB
Program.logger.Info("New symbols added successfully!");
}
}
return(true);
}
catch (Exception ex)
{
Program.logger.Error("Error while adding new symbols.");
Program.logger.Error(ex.Message);
return(false);
}
}
/// <summary>
/// To Delete Old Best Rates
/// </summary>
/// <returns>Success or Fails (True or False)</returns>
public bool DeleteOldBestRates()
{
CurrencyExchangeEntities currencyExchangeEntities = new CurrencyExchangeEntities();
try
{
//Deleting old best rates
currencyExchangeEntities.BestRates.RemoveRange(currencyExchangeEntities.BestRates); //DB
currencyExchangeEntities.SaveChanges(); //DB
Program.logger.Info("Old best rates deleted successfully!");
return(true);
}
catch (Exception ex)
{
Program.logger.Error("Error while deleting old best rates.");
Program.logger.Error(ex.Message);
return(false);
}
}
/// <summary>
/// To Fetch And Insert Rates
/// </summary>
/// <returns>Success or Fails (True or False)</returns>
public bool FetchAndInsertRates()
{
CurrencyExchangeEntities currencyExchangeEntities = new CurrencyExchangeEntities();
try
{
//Check data is available for today
List <ExchangeRate> todayExchangeRates = currencyExchangeEntities.ExchangeRates.Where(x => x.Date == DateTime.Today).ToList();
if (todayExchangeRates.Count == 0)
{
List <ExchangeRate> exchangeRates = new List <ExchangeRate>();
//Fetching rates from all the recources
foreach (iDataResource dataSource in _dataSources)
{
exchangeRates.AddRange(dataSource.FetchTodayExchangeRates());
}
if (exchangeRates.Count() > 0)
{
//Adding rates from all the recources into DB
foreach (var rate in exchangeRates)
{
ExchangeRate exchangeRate = new ExchangeRate();
exchangeRate.DataSourceId = rate.DataSourceId;
exchangeRate.CurrencyId = rate.CurrencyId;
exchangeRate.Rate = rate.Rate;
exchangeRate.Date = rate.Date;
currencyExchangeEntities.ExchangeRates.Add(exchangeRate); //DB
}
currencyExchangeEntities.SaveChanges(); //DB
Program.logger.Info("Today exchange rates added successfully!");
}
}
return(true);
}
catch (Exception ex)
{
Program.logger.Error("Error while adding today rates.");
Program.logger.Error(ex.Message);
return(false);
}
}
/// <summary>
/// To Find Best Rates And Add
/// </summary>
/// <returns>Success or Fails (True or False)</returns>
public bool FindBestRatesAndAdd()
{
CurrencyExchangeEntities currencyExchangeEntities = new CurrencyExchangeEntities();
try
{
var todayBestRates = currencyExchangeEntities.BestRates.Where(x => x.Date == DateTime.Today).ToList();
if (todayBestRates.Count() == 0)
{
//Finding best rate by comparing them by grouping them by symbol
var groupedResult = currencyExchangeEntities.ExchangeRates.Where(x => x.Date == DateTime.Today).GroupBy(x => x.CurrencyId);
if (groupedResult.Count() > 0)
{
foreach (var group in groupedResult)
{
BestRate bestRate = new BestRate();
foreach (var item in group)
{
if (item.Rate > bestRate.Rate)
{
bestRate.Rate = item.Rate;
bestRate.CurrencyId = item.CurrencyId;
bestRate.DataSourceId = item.DataSourceId;
bestRate.Date = item.Date;
}
}
currencyExchangeEntities.BestRates.Add(bestRate); //DB
}
currencyExchangeEntities.SaveChanges(); //DB
Program.logger.Info("Today best rates added successfully!");
}
}
return(true);
}
catch (Exception ex)
{
Program.logger.Error("Error while adding today best rates.");
Program.logger.Error(ex.Message);
return(false);
}
}
