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Scala example source code file (SingleThreadedScheduler.scala)

This example Scala source code file (SingleThreadedScheduler.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Scala tags/keywords

ischeduler, queue, runnable, runnable, singlethreadedscheduler, singlethreadedscheduler, trackedreactor, trackedreactor, unit, unit

The Scala SingleThreadedScheduler.scala source code

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2005-2011, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */


package scala.actors
package scheduler

import scala.collection.mutable.Queue

/**
 * This scheduler executes actor tasks on the current thread.
 *
 * @author Philipp Haller
 */
class SingleThreadedScheduler extends IScheduler {

  private val tasks = new Queue[Runnable]

  /** The maximum number of nested tasks that are run
   *  without unwinding the call stack.
   */
  protected val maxNesting = 10

  private var curNest = 0
  private var isShutdown = false

  def execute(task: Runnable) {
    if (curNest < maxNesting) {
      curNest += 1
      task.run()
    } else {
      curNest = 0
      tasks += task
    }
  }

  def execute(fun: => Unit): Unit =
    execute(new Runnable {
      def run() { fun }
    })

  def shutdown() {
    isShutdown = false
    while (!tasks.isEmpty) {
      val task = tasks.dequeue()
      task.run()
    }
    isShutdown = true
  }

  def newActor(actor: TrackedReactor) {}
  def terminated(actor: TrackedReactor) {}

  // TODO: run termination handlers at end of shutdown.
  def onTerminate(actor: TrackedReactor)(f: => Unit) {}

  def isActive =
    !isShutdown

  def managedBlock(blocker: scala.concurrent.ManagedBlocker) {
    blocker.block()
  }
}

Other Scala examples (source code examples)

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