experiments/akkastream/src/main/scala/org/apache/gearpump/akkastream/example/Test6.scala

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 * 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
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package org.apache.gearpump.akkastream.example

import akka.actor.{Actor, ActorSystem, Props}
import akka.stream.scaladsl.Sink
import akka.stream.{ActorMaterializer, ActorMaterializerSettings}
import org.apache.gearpump.akkastream.GearpumpMaterializer
import org.apache.gearpump.akkastream.scaladsl.GearSource
import org.apache.gearpump.cluster.main.{ArgumentsParser, CLIOption}
import org.apache.gearpump.streaming.dsl.scalaapi.CollectionDataSource
import org.apache.gearpump.util.AkkaApp

import scala.concurrent.Await
import scala.concurrent.duration._


/**
 *  WordCount example
 * Test GroupBy2 (groupBy which uses SubFlow is not implemented yet)
 */

import org.apache.gearpump.akkastream.scaladsl.Implicits._

object Test6 extends AkkaApp with ArgumentsParser {
  // scalastyle:off println
  override val options: Array[(String, CLIOption[Any])] = Array(
    "gearpump" -> CLIOption[Boolean]("<boolean>", required = false, defaultValue = Some(false))
  )

  override def main(akkaConf: Config, args: Array[String]): Unit = {
    val config = parse(args)
    implicit val system = ActorSystem("Test6", akkaConf)
    implicit val materializer: ActorMaterializer = config.getBoolean("gearpump") match {
      case true =>
        GearpumpMaterializer()
      case false =>
        ActorMaterializer(
          ActorMaterializerSettings(system).withAutoFusing(false)
        )
    }
    val echo = system.actorOf(Props(Echo()))
    val sink = Sink.actorRef(echo, "COMPLETE")
    val sourceData = new CollectionDataSource(
      List(
        "this is a good start",
        "this is a good time",
        "time to start",
        "congratulations",
        "green plant",
        "blue sky")
    )
    val source = GearSource.from[String](sourceData)
    source.mapConcat({line =>
      line.split(" ").toList
    }).groupBy2(x => x)
      .map(word => (word, 1))
      .reduce({(a, b) =>
        (a._1, a._2 + b._2)
      })
      .log("word-count")
      .runWith(sink)

    Await.result(system.whenTerminated, 60.minutes)
  }

  case class Echo() extends Actor {
    def receive: Receive = {
      case any: AnyRef =>
        println("Confirm received: " + any)
    }
  }
  // scalastyle:on println
}