examples/streaming/wordcount/src/main/scala/org/apache/gearpump/streaming/examples/wordcount/dsl/WordCount.scala

/*
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 * 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,
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 * See the License for the specific language governing permissions and
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package org.apache.gearpump.streaming.examples.wordcount.dsl

import org.apache.gearpump.cluster.client.ClientContext
import org.apache.gearpump.cluster.main.{ArgumentsParser, CLIOption}
import org.apache.gearpump.streaming.dsl.scalaapi.StreamApp
import org.apache.gearpump.streaming.dsl.scalaapi.StreamApp._
import org.apache.gearpump.util.AkkaApp

/** Same WordCount with High level DSL syntax */
object WordCount extends AkkaApp with ArgumentsParser {

  override val options: Array[(String, CLIOption[Any])] = Array.empty

  override def main(akkaConf: Config, args: Array[String]): Unit = {
    val context = ClientContext(akkaConf)
    val app = StreamApp("dsl", context)
    val data = "This is a good start, bingo!! bingo!!"
    app.source(data.lines.toList, 1, "source").
      // word => (word, count)
      flatMap(line => line.split("[\\s]+")).map((_, 1)).
      // (word, count1), (word, count2) => (word, count1 + count2)
      groupByKey().sum.log

    val appId = context.submit(app)
    context.close()
  }
}