Decouple a CalcWorker that does the Quant calc from BlackScholesOptionPricerService

[bleunguts]

Extract into separate BackgroundService execution engine
See C:\Dev\projects(AspNetCore) Background Services\asp-dot-net-core-6-dot-net-6-creating-background-services\src\TennisBookings.ScoreProcessor\BackgroundServices

Design1:

• PricingTasksController (WebApi)
  • Ping endpoint
  • PricingTaskRequested endpoint drops request onto queue
  • PricingTaskCompleted endpoint notifies via signalR bus that task has completed
• QueueReaderService (BackgroundService) picks messages off MQ and calls Calc() on relevant calculator
• On Task Completion POST to TaskCompleted endpoint
• WPF read signalR bus to update results on screen
  Tech: SlimMessageBus (abstractionLayer) and NServiceBus or RabbitMQ

Design2:

• PricingController API
• PricingTaskProcessor : BackgroundService interacts with API via channels. So this will be in process
• On PricingTaskProcessor.Execute() will trigger Invoke of AnalyticsLib.Price()
• On PricingTaskProcessor.Execute() completion it will talk via channel to ASPNetCore Controller
• On Subscribing To FX prices use ServerSentEvents https://dev.to/masanori_msl/aspnet-core-try-server-sent-events-5db2 or higher level SignalR
  Tech: BackgroundService, Channels