CODEWITHSUNDEEP
scala
Saquib Gul
Saquib Gul

Reputation: 69

SCALA: How I can initiate another future call within callback from future

My scenario is, I have multiple API's call to be made and each of them will require to use data from previous call.

Now let's suppose I made a API call with future, and return response of the first call, I am not able to call next API from within Oncomplete of first call.

Upvotes: 0

Views: 404

Answers (2)

flavian
flavian

Reputation: 28511

You could use flatMap or the cleaner alternative to sequencing a bunch of of futures, which is to use the for yield syntax. It's just compile time sugar that will internally transform itself into flatMap and map and withFilter method calls, but it's generally cleaner and easier to read.

import scala.concurrent.ExecutionContext.Implicits.global

for {
  first <- firstApiCall()
  second <- secondApiCall(first)
} yield second

Upvotes: 3

mavarazy
mavarazy

Reputation: 7735

You can link Futures with flatMap function

def firstApiCall(): Future[FirstRes]

def secondApiCall(firstRes: FirstRes): Future[SecondRes]

def combinedCall()(implicit ec: ExecutionContext): Future[SecondRes] = firstApiCall.flatMap(res => secondApiCall(res))

Upvotes: 5

Related Questions