examples/streaming/kudu/src/main/scala/org/apache/gearpump/streaming/examples/kudu/KuduConn.scala

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 * distributed with this work for additional information
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 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
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 *
 *      http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.gearpump.streaming.examples.kudu

import akka.actor.ActorSystem
import org.apache.gearpump.cluster.UserConfig
import org.apache.gearpump.cluster.client.ClientContext
import org.apache.gearpump.cluster.main.{ArgumentsParser, CLIOption, ParseResult}
import org.apache.gearpump.external.kudu.KuduSink
import org.apache.gearpump.streaming.StreamApplication
import org.apache.gearpump.streaming.partitioner.HashPartitioner
import org.apache.gearpump.streaming.sink.DataSinkProcessor
import org.apache.gearpump.streaming.source.DataSourceProcessor
import org.apache.gearpump.util.Graph.Node
import org.apache.gearpump.util.{AkkaApp, Graph, LogUtil}
import org.slf4j.Logger

object KuduConn extends AkkaApp with ArgumentsParser {
  private val LOG: Logger = LogUtil.getLogger(getClass)
  val RUN_FOR_EVER = -1

  override val options: Array[(String, CLIOption[Any])] = Array(
    "splitNum" -> CLIOption[Int]("<how many sum tasks>", required = false, defaultValue = Some(1)),
    "sinkNum" -> CLIOption[Int]("<how many sum tasks>", required = false, defaultValue = Some(1))
  )

  def application(config: ParseResult, system: ActorSystem): StreamApplication = {
    implicit val actorSystem = system
    val splitNum = config.getInt("splitNum")
    val sinkNum = config.getInt("sinkNum")

    val map = Map[String, String]("KUDUSINK" -> "kudusink", "kudu.masters" -> "kuduserver",
      "KUDU_USER" -> "kudu.user", "GEARPUMP_KERBEROS_PRINCIPAL" -> "gearpump.kerberos.principal",
      "GEARPUMP_KEYTAB_FILE" -> "gearpump.keytab.file", "TABLE_NAME" -> "kudu.table.name"
    )

    val userConfig = new UserConfig(map)
    val split = new Split
    val sourceProcessor = DataSourceProcessor(split, splitNum, "Split")
    val sink = KuduSink(userConfig, "impala::default.kudu_1")
    val sinkProcessor = DataSinkProcessor(sink, sinkNum)
    val partitioner = new HashPartitioner
    val computation = sourceProcessor ~ partitioner ~> sinkProcessor
    val application = StreamApplication("Kudu", Graph(computation), userConfig)

    application
  }

  override def main(akkaConf: Config, args: Array[String]): Unit = {
    val config = parse(args)
    val context = ClientContext(akkaConf)
    val appId = context.submit(application(config, context.system))
    context.close()
  }
}