content: /**
   * 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.apex.examples.kafka.exactlyonceoutput;
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.FilenameFilter;
  import java.io.IOException;
  
  import javax.validation.ConstraintViolationException;
  
  import org.junit.After;
  import org.junit.Assert;
  import org.junit.Before;
  import org.junit.Rule;
  import org.junit.Test;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import org.apache.commons.io.FileUtils;
  import org.apache.commons.io.IOUtils;
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.net.NetUtils;
  
  import com.datatorrent.api.LocalMode;
  
  import info.batey.kafka.unit.KafkaUnit;
  import info.batey.kafka.unit.KafkaUnitRule;
  
  import static org.junit.Assert.fail;
  
  /**
   * Test the DAG declaration in local mode.
   */
  public class ApplicationTest
  {
    private static final String directory = "target/exactlyonceoutput";
    private String tuplesUntilKill;
  
    private final int zkPort = NetUtils.getFreeSocketPort();
    private final int brokerPort = NetUtils.getFreeSocketPort();
    private final String broker = "localhost:" + brokerPort;
  
    private static final Logger logger = LoggerFactory.getLogger(ApplicationTest.class);
  
    // broker port must match properties.xml
    @Rule
    public KafkaUnitRule kafkaUnitRule = new KafkaUnitRule(zkPort, brokerPort);
  
    //remove '@After' to keep validation output file
    @Before
    @After
    public void cleanup()
    {
      FileUtils.deleteQuietly(new File(directory));
    }
  
    @Test
    public void testApplication() throws IOException, Exception
    {
      try {
        createTopics();
  
        // run app asynchronously; terminate after results are checked
        Configuration conf = getConfig();
        LocalMode lma = LocalMode.newInstance();
        lma.prepareDAG(new Application(), conf);
        ValidationToFile validationToFile = (ValidationToFile)lma.getDAG().getOperatorMeta("validationToFile").getOperator();
        LocalMode.Controller lc = lma.getController();
        lc.runAsync();
  
        // waits for the validation application to be done before shutting it down and checking its output
        int count = 1;
        int maxSleepRounds = 300;
        while (!validationToFile.validationDone) {
          logger.info("Sleeping ....");
          Thread.sleep(500);
          if (count > maxSleepRounds) {
            fail("validationDone flag did not get set to true in ValidationToFile operator");
          }
          count++;
        }
        lc.shutdown();
        checkOutput();
      } catch (ConstraintViolationException e) {
        fail("constraint violations: " + e.getConstraintViolations());
      }
    }
  
    private Configuration getConfig()
    {
      Configuration conf = new Configuration(false);
      conf.addResource(this.getClass().getResourceAsStream("/META-INF/properties-KafkaExactlyOnceOutput.xml"));
      conf.set("dt.operator.passthrough.prop.directoryPath", directory);
      conf.set("dt.operator.validationToFile.prop.filePath", directory);
      conf.set("dt.operator.kafkaTopicExactly.prop.clusters", broker);
      conf.set("dt.operator.kafkaTopicAtLeast.prop.clusters", broker);
      conf.set("dt.operator.kafkaOutputOperator.prop.properties(bootstrap.servers)", broker);
      conf.set("dt.operator.kafkaExactlyOnceOutputOperator.prop.properties(bootstrap.servers)", broker);
      tuplesUntilKill = conf.get("dt.operator.passthrough.prop.tuplesUntilKill");
      return conf;
    }
  
    private void createTopics() throws Exception
    {
      KafkaUnit ku = kafkaUnitRule.getKafkaUnit();
      ku.createTopic("exactly-once");
      ku.createTopic("at-least-once");
    }
  
    private void checkOutput() throws IOException
    {
      String validationOutput = "";
      File folder = new File(directory);
  
      FilenameFilter filenameFilter = new FilenameFilter()
      {
        @Override
        public boolean accept(File dir, String name)
        {
          if (name.split("_")[0].equals("validation.txt")) {
            return true;
          }
          return false;
        }
      };
      File validationFile = folder.listFiles(filenameFilter)[0];
      try (FileInputStream inputStream = new FileInputStream(validationFile)) {
        while (validationOutput.isEmpty()) {
          validationOutput = IOUtils.toString(inputStream);
          logger.info("Validation output: {}", validationOutput);
        }
      }
  
      Assert.assertTrue(validationOutput.contains("exactly-once: 0"));
  
      //assert works only for tuplesUntilKill values low enough to kill operator before checkpointing
      Assert.assertEquals("Duplicates: exactly-once: 0, at-least-once: " + tuplesUntilKill, validationOutput);
    }
  }
  