static Agent <string> StartAgentFor
(string ccyPair, Agent <FxRateResponse> sendResponse)
=> Agent.Start <Option <decimal>, string>(None, async(optRate, recipient) =>
{
decimal rate = await optRate.Map(Async)
.GetOrElse(() => Yahoo.GetRate(ccyPair));
sendResponse.Tell(new FxRateResponse
{
CcyPair = ccyPair,
Rate = rate,
Recipient = recipient,
});
return(Some(rate));
});
