Play Framework/Scala example source code file (Execution.scala)

This example Play Framework source code file (Execution.scala) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Play Framework (and Scala) source code examples by using tags.

All credit for the original source code belongs to Play Framework; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Play Framework tags/keywords

atomicinteger, closablelazy, closefunction, concurrent, core, execution, forkjoin, forkjoinpool, forkjoinworkerthread, forkjoinworkerthreadfactory, namedfjpthread, namedfjpthreadfactory, play, play framework, string

The Execution.scala Play Framework example source code

/*
 * Copyright (C) 2009-2013 Typesafe Inc. <http://www.typesafe.com>
 */
package play.core

import scala.concurrent.ExecutionContext
import scala.concurrent.forkjoin.{ ForkJoinWorkerThread, ForkJoinPool }
import java.util.concurrent.Executors
import java.util.concurrent.atomic.AtomicInteger
import scala.concurrent.forkjoin.ForkJoinPool.ForkJoinWorkerThreadFactory
import java.util.concurrent.ExecutorService

private[play] object Execution {

  def internalContext: ExecutionContext = lazyContext.get()

  object Implicits {

    implicit def internalContext = Execution.internalContext

  }

  val lazyContext = new ClosableLazy[ExecutionContext] {

    protected def create() = {
      class NamedFjpThread(fjp: ForkJoinPool) extends ForkJoinWorkerThread(fjp)

      /**
       * A named thread factory for the scala fjp as distinct from the Java one.
       */
      case class NamedFjpThreadFactory(name: String) extends ForkJoinWorkerThreadFactory {
        val threadNo = new AtomicInteger()
        val backingThreadFactory = Executors.defaultThreadFactory()

        def newThread(fjp: ForkJoinPool) = {
          val thread = new NamedFjpThread(fjp)
          thread.setName(name + "-" + threadNo.incrementAndGet())
          thread
        }
      }

      val numberOfThreads = play.api.Play.maybeApplication.map(_.configuration.getInt("internal-threadpool-size")).flatten
        .getOrElse(Runtime.getRuntime.availableProcessors)

      val service = new ForkJoinPool(
        numberOfThreads,
        NamedFjpThreadFactory("play-internal-execution-context"),
        null,
        true)
      val context = ExecutionContext.fromExecutorService(service)

      val close: CloseFunction = () => service.shutdown()

      (context, close)
    }

  }

}