akka 定時任務實例for play2.1

    有時須要設定未來發生的事情，這時該怎麼辦?ActorSystem搞定一切! 在那兒你能找到scheduler方法，它返回一個 akka.actor.Scheduler 實例, 這個實例在每一個Actor系統裏是惟一的，用來指定一段時間後發生的行爲。請注意定時任務是使用ActorSystem的MessageDispatcher執行的.

    你能夠計劃向actor發送消息或執行任務的代碼 (函數或Runnable). 你會獲得一個Cancellable類型的返回值，你能夠調用cancel來取消定時任務的執行。

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."))
  }

}