playframework-2.0 - play framework 2.1 - 调度异步任务

Question

在 play 的 2.0.x 文档中，您可以看到如何安排异步任务：

http://www.playframework.org/documentation/2.0.4/ScalaAkka

Akka.system.scheduler.schedule(0 seconds, 30 minutes, testActor, "tick")

你怎么能用最近发布的 Play 2.1 实现同样的目标？？？

整个akka API似乎已经改变了......

我检查过：

https://github.com/playframework/Play20/wiki/Highlights https://github.com/playframework/Play20/wiki/Migration 以及 http://doc.akka.io/docs/akka/2.1.0- RC1/project/migration-guide-2.0.x-2.1.x.html

还在这里问：https ://groups.google.com/d/topic/play-framework/7VcwNea6QlM/discussion

Answer 1

使用示例代码和Akka API我进行了快速测试，对我有用。

比较 2.0.4 和 2.1RC1 之间的代码，我可以看到调度程序只有两个变化：

1. 替换进口

   // import akka.util.duration._
   import scala.concurrent.duration._
   

2. 添加导入：

   import play.api.libs.concurrent.Execution.Implicits._
   

app/controllers/Application.scala

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."))
  }

}

编辑

Nota bene，正如我从 Julien 在该组的帖子中看到的那样，defaultContext仅导入就足够了：

import play.api.libs.concurrent.Execution.Implicits.defaultContext

Answer 2

biesior的回答很棒

但是，如果您不想，则不必通过演员。这是使用 good old 的相同答案java.lang.Runnable：

Akka.system.scheduler.schedule(5 minutes, 5 minutes, new Runnable {
  def run() {
    Logger.info("that still ticks!")
  }
})
Akka.system.scheduler.scheduleOnce(7 minutes, new Runnable {
  def run() {
    Logger.warn("... 7 seconds after start, only once")
  }
})

Answer 3

例如，在 java 中每周六上午 15 点运行一个任务：

DateTime now = new DateTime();

DateTime plannedStart = new DateTime()
    .withDayOfWeek(DateTimeConstants.SATURDAY)
    .withHourOfDay(15)
    .withMinuteOfHour(0)
    .withSecondOfMinute(0)
    .withMillisOfSecond(0);

DateTime nextRun = (now.isAfter(plannedStart))
    ? plannedStart.plusDays(7)
    : plannedStart;

Long nextRunInSeconds = (long) secondsBetween(now, nextRun).getSeconds();

Akka.system().scheduler().schedule(
    Duration.create(nextRunInSeconds, TimeUnit.SECONDS),
    Duration.create(7, TimeUnit.DAYS) ,
    new Runnable() {
        public void run() {
            Logger.info("-------------------------scheduler start : " + new DateTime());
        }
    },
    Akka.system().dispatcher()
);