Question

我最近开始使用Scala和Play Framework，刚刚升级了我一直致力于Play 2.4.3的服务。我的最终目标是创建一个夜间进程，在我的播放应用程序中启动一个服务方法，以便通过方法调用来调度事件，我目前正在调用一个方法。

我有一个基本的想法，通过一个覆盖onStart的Global.scala文件工作，但后来我看到了关于放弃使用GlobalSettings（https://www.playframework.com/documentation/2.4.x/GlobalSettings）的游戏文档并且一直试图移动它是一种注入依赖的方法。

这是我到目前为止所拼凑的内容：

模块代码：

import javax.inject._

import com.myOrganization.myPackage.Actors.ScheduleActor
import play.api.libs.concurrent.AkkaGuiceSupport
import play.libs.Akka
import play.api.libs.concurrent.Execution.Implicits.defaultContext
import akka.actor.{ActorRef, ActorSystem}
import scala.concurrent.duration._
import play.Application

import com.google.inject.AbstractModule

@Singleton
class NightlyEvalSchedulerStartup @Inject()(system: ActorSystem, @Named("ScheduleActor") scheduleActor: ActorRef) {
  Akka.system.scheduler.schedule(10.seconds, 20.seconds, scheduleActor, "ScheduleActor")
}

class ScheduleModule extends AbstractModule with AkkaGuiceSupport {
  def configure() = {
    bindActor[ScheduleActor]("ScheduleActor")
    bind(classOf[NightlyEvalSchedulerStartup]).asEagerSingleton
  }
}

演员班：

import akka.actor.{Actor, Props}
import com.myOrganization.myPackage.services.MySchedulingService

object ScheduleActor {
  def props = Props[ScheduleActor]

  class updateSchedules
}

class ScheduleActor extends Actor {
  val MySchedulingService: MySchedulingService = new MySchedulingService
  def receive = {
    case "runScheduler" => MySchedulingService.nightlyScheduledUpdate()
  }
}

Application.conf

play.modules.enabled += "com.myOrganization.myPackage.modules.ScheduleModule"

该服务正在调用一个主要基于scala逻辑代码和Anorm数据库交互的方法。

每当我尝试使用激活器启动（或运行，一旦收到Http请求）启动服务时，我会收到以下错误：

Oops, cannot start the server.
com.google.inject.CreationException: Unable to create injector, see the following errors:

1) Error injecting constructor, java.lang.RuntimeException: There is no started application

我尝试用简单的println（）替换Aka.system.scheduler ...片段来运行相同的代码，一切似乎工作正常，这意味着服务启动了，我看到了我的消息安慰。因此，我猜测我在Akka调度程序中缺少一些导致它爆炸的依赖。你能提供的任何建议都很棒，我一整天都在反对这一点。

编辑（按请求解决的代码）：

模块代码，附带一些代码，可以在第二天晚上3点进行粗略估算。这可能会改变这一行，但它现在有效：

package com.myOrganization.performanceManagement.modules

import com.myOrganization.performanceManagement.Actors.ScheduleActor
import com.myOrganization.performanceManagement.Actors.ScheduleActor.nightlySchedule
import org.joda.time.{Seconds, LocalDate, LocalTime, LocalDateTime}
import play.api.libs.concurrent.AkkaGuiceSupport
import play.api.libs.concurrent.Execution.Implicits.defaultContext
import akka.actor.{ActorRef, ActorSystem}
import scala.concurrent.duration.{FiniteDuration, SECONDS, HOURS }
import org.joda.time._
import com.google.inject.{Inject, Singleton, AbstractModule}
import com.google.inject.name.Named

class ScheduleModule extends AbstractModule with AkkaGuiceSupport {
  override def configure() = {
    bindActor[ScheduleActor]("ScheduleActor")
    bind(classOf[NightlyEvalSchedulerStartup]).asEagerSingleton()
  }
}

@Singleton
class NightlyEvalSchedulerStartup @Inject()(system: ActorSystem, @Named("ScheduleActor") scheduleActor: ActorRef) {
  //Calculate initial delay to 3am the next day.
  val currentTime: DateTime = DateTime.now
  val targetDateTime = currentTime.plusDays(1).withTimeAtStartOfDay()

  //Account for Daylight savings to an extent, not mandatory that it starts at 3am, just after midnight.
  val initialDelaySeconds = targetDateTime.getHourOfDay match {
    case 0 => new Duration(currentTime, targetDateTime.plusHours(3)).getStandardSeconds
    case 1 => new Duration(currentTime, targetDateTime.plusHours(2)).getStandardSeconds
  }

  //Schedule first actor firing to occur at calculated delay and then every 24 hours.
  system.scheduler.schedule(FiniteDuration(initialDelaySeconds, SECONDS), FiniteDuration(24, HOURS), scheduleActor, nightlySchedule)
}

演员：

package com.myOrganization.performanceManagement.Actors

import akka.actor.{ActorSystem, Actor}
import com.google.inject.Inject
import com.myOrganization.performanceManagement.services.PMEvalSchedulingService

object ScheduleActor {
  case object nightlySchedule
}

class ScheduleActor @Inject() (actorSystem: ActorSystem) extends Actor {
  val pMEvalSchedulingService: PMEvalSchedulingService = new PMEvalSchedulingService
  override def receive: Receive = {
    case nightlySchedule =>
        println("Called the scheduler")
        pMEvalSchedulingService.nightlyScheduledEvaluationsUpdate()
  }
}

在系统启动时安排重复的演员播放2.4.3

0 个答案: