228. Assembling StructuredTaskScope

In the previous problem (Problem 227), we developed an application containing a ridesharing service and a public transport service. In both services, we used StructuredTaskScope to concurrently query the proper servers. However, only the servers were called concurrently while these two services were executed sequentially – first, we run the ridesharing service (which queries concurrently three servers), and after we have a result from this service, we run the public transport service (which queries concurrently four servers).

Going further, we want to assemble these two services into a third service capable of running them concurrently as in the following diagram:

Figure 11.6: Running the ridesharing and public transport services concurrently

We start by assembling the RidesharingOffer and PublicTransportOffer into a record named TravelOffer:

public record TravelOffer(RidesharingOffer ridesharingOffer, 
  PublicTransportOffer...