/// <summary>
/// <inheritdoc/>
/// </summary>
/// <param name="source"><inheritdoc/></param>
/// <param name="dest"><inheritdoc/></param>
/// <param name="amount"><inheritdoc/></param>
/// <returns><inheritdoc/></returns>
protected override async Task <TimedQuote> getQuoteAsync(Currencies source, Currencies dest, ConversionBag convStatus)
{
// conditions of convertibility have been done already, but convStatus can be null
if (convStatus == null)
{
convStatus = new ConversionBag();
}
string idKey = $"{source}{dest}{DefaultCurrency}{this.GetHashCode()}";
convStatus.Bag.Add(idKey, "yes");
var qs = await ConversionProviderFactory.GetConversionProvider().GetQuoteAsync(source, DefaultCurrency, convStatus);
if (qs == null)
{
return(null);
}
var qd = await ConversionProviderFactory.GetConversionProvider().GetQuoteAsync(dest, DefaultCurrency, convStatus);
if (qd == null)
{
return(null);
}
return(new TimedQuote()
{
BaseCurrency = source,
QuoteCurrency = dest,
Midpoint = qs.Midpoint / qd.Midpoint,
UpdatedAtUTC = qs.UpdatedAtUTC < qd.UpdatedAtUTC ? qs.UpdatedAtUTC : qd.UpdatedAtUTC
});
}
/// <summary>
/// <inheritdoc/>
/// </summary>
/// <param name="source"><inheritdoc/></param>
/// <param name="dest"><inheritdoc/></param>
/// <param name="convStatus"><inheritdoc/></param>
/// <returns><inheritdoc/></returns>
public virtual TimedQuote GetQuote(Currencies source, Currencies dest, ConversionBag convStatus)
{
if (source == dest)
{
return new TimedQuote()
{
BaseCurrency = source, Midpoint = 1, QuoteCurrency = dest, UpdatedAtUTC = DateTime.UtcNow.AddYears(1)
}
}
;
if (CanConvert(source, dest, convStatus) == true)
{
TimedQuote quote = getQuote(source, dest, convStatus);
if (quote != null && quote.UpdatedAtUTC.AddMilliseconds(ConversionProviderFactory.QuotesValidForMillis) >= DateTime.UtcNow)
{
if (this is CacheConversionProvider == false) // if the provider who got us the quote is not the cache provider
{
ConversionProviderFactory.AddToCache(quote, quote.UpdatedAtUTC); // add the quote to the cache
}
return(quote);
}
}
if (TryNext == false)
{
return(null);
}
return(ConversionProviderFactory.GetNext(this)?.GetQuote(source, dest, convStatus));
}
/// <summary>
/// <inheritdoc/>
/// </summary>
/// <param name="source"><inheritdoc/></param>
/// <param name="dest"><inheritdoc/></param>
/// <param name="amount"><inheritdoc/></param>
/// <returns><inheritdoc/></returns>
protected override TimedQuote getQuote(Currencies source, Currencies dest, ConversionBag convStatus)
{
var quote = FixedConversions.ContainsKey(source) ? FixedConversions[source][dest] : FixedConversions[dest][source];
// conditions of convertibility have been done already
return(new TimedQuote()
{
BaseCurrency = source,
QuoteCurrency = dest,
Midpoint = source == quote.BaseCurrency ? quote.Midpoint : 1 / quote.Midpoint,
UpdatedAtUTC = DateTime.UtcNow
});
}
public override bool CanConvert(Currencies source, Currencies dest, ConversionBag convStatus)
{
if (base.CanConvert(source, dest, convStatus) == false)
{
return(false);
}
lock (sync)
{
bool containsQuote = quotes.ContainsKey(source) && quotes[source].ContainsKey(dest);
bool isValid = containsQuote && quotes[source][dest].UpdatedAtUTC.AddMilliseconds(CacheExpirationMillis) >= DateTime.UtcNow;
return(containsQuote && isValid);
}
}
/// <summary>
/// Will be able to convert only if both currencies are different from the BaseCurrency
/// <inheritdoc/>
/// </summary>
/// <param name="source"><inheritdoc/></param>
/// <param name="dest"><inheritdoc/></param>
/// <returns></returns>
public override bool CanConvert(Currencies source, Currencies dest, ConversionBag convStatus)
{
if (base.CanConvert(source, dest, convStatus) == false)
{
return(false);
}
string idKey = $"{source}{dest}{DefaultCurrency}{this.GetHashCode()}";
if (convStatus?.Bag.ContainsKey(idKey) ?? false)
{
return(false);
}
return(source != DefaultCurrency && dest != DefaultCurrency);
}
/// <summary>
/// <inheritdoc/>
/// </summary>
/// <param name="source"><inheritdoc/></param>
/// <param name="dest"><inheritdoc/></param>
/// <param name="amount"><inheritdoc/></param>
/// <returns> <inheritdoc/></returns>
public decimal Convert(Currencies source, Currencies dest, decimal amount, ConversionBag convStatus)
{
if (source.Equals(dest))
{
return(amount);
}
if (amount == decimal.Zero || amount == decimal.MinValue || amount == decimal.MaxValue)
{
return(amount);
}
var quote = GetQuote(source, dest, convStatus);
if (quote == null)
{
return(decimal.MinValue);
}
return(quote.BaseCurrency.Equals(source) ? quote.Midpoint * amount : amount / quote.Midpoint);
}
/// <summary>
/// <inheritdoc/>
/// </summary>
/// <param name="source"> <inheritdoc/></param>
/// <param name="dest"> <inheritdoc/></param>
/// <returns> <inheritdoc/></returns>
public virtual bool CanConvert(Currencies source, Currencies dest, ConversionBag convStatus)
{
return(Currency.GetBySymbol(source) != null && Currency.GetBySymbol(dest) != null);
}
/// <summary>
/// When implemented in derived class, asynchronously gets a quote for the given pair or null if not found,
/// conditions of convertibility have already been checked
/// The returned Quote will have BaseCurrency=source and QuoteCurrency=dest
/// </summary>
/// <param name="source">The currency to convert from</param>
/// <param name="dest">The currency to convert to</param>
protected virtual async Task <TimedQuote> getQuoteAsync(Currencies source, Currencies dest, ConversionBag convStatus)
{
return(getQuote(source, dest, convStatus));
}
/// <summary> /// When implemented in derived class gets a quote for the given pair or null if not found, /// conditions of convertibility have already been checked /// The returned Quote will have BaseCurrency=source and QuoteCurrency=dest /// </summary> /// <param name="source">The currency to convert from</param> /// <param name="dest">The currency to convert to</param> protected abstract TimedQuote getQuote(Currencies source, Currencies dest, ConversionBag convStatus);
/// <summary>
/// <inheritdoc/>
/// </summary>
/// <param name="source"><inheritdoc/></param>
/// <param name="dest"><inheritdoc/></param>
/// <returns></returns>
public override bool CanConvert(Currencies source, Currencies dest, ConversionBag convStatus)
{
return(base.CanConvert(source, dest, convStatus) &&
(FixedConversions.ContainsKey(source) && FixedConversions[source].ContainsKey(dest) ||
FixedConversions.ContainsKey(dest) && FixedConversions[dest].ContainsKey(source)));
}
protected override TimedQuote getQuote(Currencies source, Currencies dest, ConversionBag convStatus)
{
return(quotes[source][dest]);
}