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   * 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
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   *
   *   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
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  package org.apache.apex.examples.exactlyonce;
  
  import java.io.File;
  
  import org.junit.Assert;
  import org.junit.Rule;
  import org.junit.Test;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import org.apache.apex.api.EmbeddedAppLauncher;
  import org.apache.apex.api.Launcher;
  import org.apache.apex.api.Launcher.AppHandle;
  import org.apache.apex.api.Launcher.LaunchMode;
  import org.apache.apex.api.Launcher.ShutdownMode;
  import org.apache.commons.io.FileUtils;
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.net.NetUtils;
  
  import com.datatorrent.api.Attribute;
  
  import info.batey.kafka.unit.KafkaUnit;
  import info.batey.kafka.unit.KafkaUnitRule;
  import kafka.producer.KeyedMessage;
  
  public class ExactlyOnceFileOutputAppTest
  {
    private static final Logger LOG = LoggerFactory.getLogger(ExactlyOnceJdbcOutputTest.class);
    private static final String TARGET_DIR = "target/atomicFileOutput";
  
    private final int brokerPort = NetUtils.getFreeSocketPort();
    private final int zkPort = NetUtils.getFreeSocketPort();
  
    @Rule
    public KafkaUnitRule kafkaUnitRule = new KafkaUnitRule(zkPort, brokerPort);
  
    {
      // required to avoid 50 partitions auto creation
      this.kafkaUnitRule.getKafkaUnit().setKafkaBrokerConfig("num.partitions", "1");
      this.kafkaUnitRule.getKafkaUnit().setKafkaBrokerConfig("offsets.topic.num.partitions", "1");
    }
  
    @Test
    public void testApplication() throws Exception
    {
      File targetDir = new File(TARGET_DIR);
      FileUtils.deleteDirectory(targetDir);
      FileUtils.forceMkdir(targetDir);
  
      KafkaUnit ku = kafkaUnitRule.getKafkaUnit();
      String topicName = "testTopic";
      // topic creation is async and the producer may also auto-create it
      ku.createTopic(topicName, 1);
  
      // produce test data
      String[] words = "count count the words from kafka and store them in a file".split("\\s+");
      for (String word : words) {
        ku.sendMessages(new KeyedMessage<String, String>(topicName, word));
      }
  
      Configuration conf = new Configuration(false);
      conf.addResource(this.getClass().getResourceAsStream("/META-INF/properties.xml"));
      conf.set("apex.operator.kafkaInput.prop.topics", topicName);
      conf.set("apex.operator.kafkaInput.prop.clusters", "localhost:" + brokerPort);
      conf.set("apex.operator.kafkaInput.prop.maxTuplesPerWindow", "2"); // consume one word per window
      conf.set("apex.operator.kafkaInput.prop.initialOffset", "EARLIEST");
      conf.set("apex.operator.fileWriter.prop.filePath", TARGET_DIR);
  
      EmbeddedAppLauncher<?> launcher = Launcher.getLauncher(LaunchMode.EMBEDDED);
      Attribute.AttributeMap launchAttributes = new Attribute.AttributeMap.DefaultAttributeMap();
      launchAttributes.put(EmbeddedAppLauncher.RUN_ASYNC, true); // terminate after results are available
      AppHandle appHandle = launcher.launchApp(new ExactlyOnceFileOutputApp(), conf, launchAttributes);
  
      long timeout = System.currentTimeMillis() + 60000; // 60s timeout
  
      File outputFile = new File(TARGET_DIR, ExactlyOnceFileOutputApp.FileWriter.FILE_NAME_PREFIX);
      while (!outputFile.exists() && timeout > System.currentTimeMillis()) {
        Thread.sleep(1000);
        LOG.debug("Waiting for {}", outputFile);
      }
  
      Assert.assertTrue("output file exists " + ExactlyOnceFileOutputApp.FileWriter.FILE_NAME_PREFIX, outputFile.exists() &&
          outputFile.isFile());
  
      String result = FileUtils.readFileToString(outputFile);
      Assert.assertTrue(result.contains("count=2"));
  
      appHandle.shutdown(ShutdownMode.KILL);
    }
  
  }
  