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

Question

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

Answer 1

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)