experiments/akkastream/src/main/scala/org/apache/gearpump/akkastream/example/Test2.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.example

import akka.actor.{Actor, ActorSystem, Props}
import akka.stream.scaladsl._
import akka.stream.{ActorMaterializer, ClosedShape}
import org.apache.gearpump.akkastream.GearpumpMaterializer
import org.apache.gearpump.akkastream.scaladsl.{GearSink, GearSource}
import org.apache.gearpump.cluster.main.ArgumentsParser
import org.apache.gearpump.util.AkkaApp

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

/**
 *
 * This tests how different Materializers can be used together in an explicit way.
 *
 */
object Test2 extends AkkaApp with ArgumentsParser {
  // scalastyle:off println
  override def main(akkaConf: Config, args: Array[String]): Unit = {
    val config = parse(args)
    implicit val system = ActorSystem("Test2", akkaConf)
    val gearpumpMaterializer = GearpumpMaterializer()

    val echo = system.actorOf(Props(new Echo()))
    val source = GearSource.bridge[String, String]
    val sink = GearSink.bridge[String, String]

    val flow = Flow[String].filter(_.startsWith("red")).map("I want to order item: " + _)
    val (entry, exit) = flow.runWith(source, sink)(gearpumpMaterializer)

    val actorMaterializer = ActorMaterializer()

    val externalSource = Source(
      List("red hat", "yellow sweater", "blue jack", "red apple", "green plant", "blue sky")
    )
    val externalSink = Sink.actorRef(echo, "COMPLETE")

    RunnableGraph.fromGraph(
      GraphDSL.create() { implicit b =>
        import GraphDSL.Implicits._
        externalSource ~> Sink.fromSubscriber(entry)
        Source.fromPublisher(exit) ~> externalSink
        ClosedShape
      }
    ).run()(actorMaterializer)

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

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