akka 定时任务实例for play2.1

    有时须要设定未来发生的事情，这时该怎么办?ActorSystem搞定一切! 在那儿你能找到scheduler方法，它返回一个 akka.actor.Scheduler 实例, 这个实例在每一个Actor系统里是惟一的，用来指定一段时间后发生的行为。请注意定时任务是使用ActorSystem的MessageDispatcher执行的.

    你能够计划向actor发送消息或执行任务的代码 (函数或Runnable). 你会获得一个Cancellable类型的返回值，你能够调用cancel来取消定时任务的执行。

package controllers

import play.api._
import play.api.mvc._
import play.libs.Akka

import akka.actor._
import scala.concurrent.duration._
import play.api.libs.concurrent.Execution.Implicits._

object Application extends Controller {

  def index = Action {

    // say hello
    Logger.info("hello, index action started")

    val Tick = "tick"
    val Tack = "tack"

    val tickActor = Akka.system.actorOf(Props(new Actor {
      def receive = {
        case Tick => Logger.info("that still ticks!")
        case Tack => Logger.warn("... 7 seconds after start, only once")
      }
    }))

    // Repeat every 5 seconds, start 5 seconds after start
    Akka.system.scheduler.schedule(
      5 seconds,
      5 seconds,
      tickActor,
      Tick
    )

    // do only once, 7 seconds after start
    Akka.system.scheduler.scheduleOnce(7 seconds, tickActor, Tack)

    Ok(views.html.index("Your new application is ready."))
  }

}