experiments/akkastream/src/main/scala/org/apache/gearpump/akkastream/task/DelayInitialTask.scala

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.gearpump.akkastream.task

import java.time.Instant
import java.util.concurrent.TimeUnit

import org.apache.gearpump.Message
import org.apache.gearpump.cluster.UserConfig
import org.apache.gearpump.streaming.task.TaskContext

import scala.concurrent.Future
import scala.concurrent.duration.FiniteDuration

case object DelayInitialTime

class DelayInitialTask[T](context: TaskContext, userConf : UserConfig)
  extends GraphTask(context, userConf) {

  val delayInitial = userConf.getValue[FiniteDuration](DelayInitialTask.DELAY_INITIAL).
    getOrElse(FiniteDuration(0, TimeUnit.MINUTES))
  var delayInitialActive = true

  override def onStart(startTime: Instant): Unit = {
    context.scheduleOnce(delayInitial)(
      self ! Message(DelayInitialTime, System.currentTimeMillis())
    )
  }
  override def onNext(msg : Message) : Unit = {
    msg.msg match {
      case DelayInitialTime =>
        delayInitialActive = false
      case _ =>
        delayInitialActive match {
          case true =>
          case false =>
            context.output(msg)
        }
    }
  }
}

object DelayInitialTask {
  val DELAY_INITIAL = "DELAY_INITIAL"
}