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.util.ArrayList;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Set;
  
  import javax.validation.constraints.NotNull;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import org.apache.apex.malhar.lib.io.fs.AbstractSingleFileOutputOperator;
  
  import com.datatorrent.api.Context;
  import com.datatorrent.api.DefaultInputPort;
  import com.datatorrent.api.StreamCodec;
  import com.datatorrent.api.annotation.InputPortFieldAnnotation;
  
  /**
   * @since 3.8.0
   */
  public class ValidationToFile extends AbstractSingleFileOutputOperator<byte[]>
  {
    private static final Logger LOG = LoggerFactory.getLogger(ValidationToFile.class);
  
    private String latestExactlyValue;
    private String latestAtLeastValue;
    //for tests
    static boolean validationDone = false;
  
    @NotNull
    private String maxTuplesTotal;
  
    List<String> exactlyList;
    List<String> atLeastList;
  
    @Override
    public void setup(Context.OperatorContext context)
    {
      super.setup(context);
      exactlyList = new ArrayList<>();
      atLeastList = new ArrayList<>();
    }
  
    @InputPortFieldAnnotation(optional = true)
    public final transient DefaultInputPort<byte[]> input = new DefaultInputPort<byte[]>()
    {
      @Override
      public void process(byte[] tuple) {}
    };
  
    public final transient DefaultInputPort<byte[]> topicExactlyInput = new DefaultInputPort<byte[]>()
    {
      @Override
      public void process(byte[] tuple)
      {
        String message = new String(tuple);
        latestExactlyValue = message;
        exactlyList.add(message);
        processTuple(tuple);
      }
  
      @Override
      public StreamCodec<byte[]> getStreamCodec()
      {
        if (ValidationToFile.this.streamCodec == null) {
          return super.getStreamCodec();
        } else {
          return streamCodec;
        }
      }
    };
  
    public final transient DefaultInputPort<byte[]> topicAtLeastInput = new DefaultInputPort<byte[]>()
    {
      @Override
      public void process(byte[] tuple)
      {
        String message = new String(tuple);
        latestAtLeastValue = message;
        atLeastList.add(message);
        processTuple(tuple);
      }
    };
  
    @Override
    protected byte[] getBytesForTuple(byte[] tuple)
    {
      if (latestExactlyValue != null && latestAtLeastValue != null) {
        if (latestExactlyValue.equals(maxTuplesTotal) && latestAtLeastValue.equals(maxTuplesTotal)) {
          Set<String> exactlySet = new HashSet<>(exactlyList);
          Set<String> atLeastSet = new HashSet<>(atLeastList);
  
          int numDuplicatesExactly = exactlyList.size() - exactlySet.size();
          int numDuplicatesAtLeast = atLeastList.size() - atLeastSet.size();
          LOG.info("Duplicates: exactly-once: " + numDuplicatesExactly + ", at-least-once: " + numDuplicatesAtLeast);
          validationDone = true;
          return ("Duplicates: exactly-once: " + numDuplicatesExactly + ", at-least-once: " + numDuplicatesAtLeast).getBytes();
        } else {
          return new byte[0];
        }
      } else {
        return new byte[0];
  
      }
    }
  
    public String getMaxTuplesTotal()
    {
      return maxTuplesTotal;
    }
  
    public void setMaxTuplesTotal(String maxTuplesTotal)
    {
      this.maxTuplesTotal = maxTuplesTotal;
    }
  }
  