public Task Handle(string requestId, dynamic vm, RouteData routeData, HttpRequest request)
{
/*
* In a production environment if multiple services are interested in the
* same post request the handling logic is much more complex than what we
* are doing in this demo. In this demo both Finance and Reservations need
* to handle the POST to /reservations/reserve. The implementation assumes
* that the host/infrastructure never fails, which is not the case in a
* production environment. In order to make this part safe, which is not the
* scope of this demo asynchronous messaging should be introduced earlier in
* the processing pipeline.
*
* More information: https://milestone.topics.it/2019/05/02/safety-first.html
*/
var message = new ReserveTicket()
{
TicketId = int.Parse((string)routeData.Values["id"]),
ReservationId = new Guid(request.Cookies["reservation-id"])
};
/*
* WARN: destination is hard-coded to reduce demo complexity.
* In a production environment routing should be configured
* at startup by the host/infrastructure.
*/
return(messageSession.Send("Reservations.Service", message));
}
public async Task Handle(ReserveTicket message, IMessageHandlerContext context)
{
Console.WriteLine($"Adding ticket '{message.TicketId}' to reservation '{message.ReservationId}'.", Color.Green);
Data.ReservationId = message.ReservationId;
/*
* Tickets are reserved indefinitely. Usually tickets booking websites
* Allow people to reserve a ticket, or keep it in the shopping cart for
* a fixed amount of time, e.g. 10 minutes. After 10 minutes if tickets
* are not purchased they are automatically released back to the pool
* of available tickets. This can be easily achieved using a timeout in
* this reservation saga. The timeout should be kicked of once the first
* time a ticket is reserved. If the timeout expires and the reservation
* is still existing all reserved tickets can be released.
*/
await context.SendLocal(new MarkTicketAsReserved()
{
ReservationId = message.ReservationId,
TicketId = message.TicketId
});
Console.WriteLine($"MarkTicketAsReserved request sent.", Color.Green);
}
