How can I execute multiple tasks in Scala?

Question

I have 50,000 tasks and want to execute them with 10 threads. In Java I should create Executers.threadPool(10) and pass runnable to is then wait to process all. Scala as I under

Answer 1

Here's another answer similar to mpilquist's response but without deprecated API and including the thread settings via a custom ExecutionContext:

import java.util.concurrent.Executors
import scala.concurrent.{ExecutionContext, Await, Future}
import scala.concurrent.duration._

val numJobs = 50000
var numThreads = 10

// customize the execution context to use the specified number of threads
implicit val ec = ExecutionContext.fromExecutor(Executors.newFixedThreadPool(numThreads))


// define the tasks
val tasks = for (i <- 1 to numJobs) yield Future {
  // do something more fancy here
  i
}

// aggregate and wait for final result
val aggregated = Future.sequence(tasks)
val oneToNSum = Await.result(aggregated, 15.seconds).sum