How to run futures in their own execution context and not on the Actor System dispatcher. [Scala|Akka]

How do we use src/main/resources/application.conf for the same where the dedicated dispatcher in our code would automatically lookup in application.conf for the dispatcher

Here's two example configurations for execution contexts you can put in your application.conf:

background-scheduled-tasks-dispatcher {                                                
  type = Dispatcher                                                                    
  executor = "fork-join-executor"    
  fork-join-executor {
    parallelism-min = 2
    parallelism-factor = 2.0
    parallelism-max = 10
  }
  throughput = 1
}

blocking-io-ec {
  type = Dispatcher
  executor = "thread-pool-executor"
  thread-pool-executor {
    fixed-pool-size = 50
  }
  throughput = 1
}

Here's an example of how to access one of them inside your app:

val ec :ExecutionContext = actorSystem.dispatchers.lookup("blocking-io-ec")

You can prefix the line with implicit val ec or you can use it explicitly

someFuture.map(myFunc)(ec)