examples/uniquecount/src/main/java/org/apache/apex/examples/uniquecount/CountVerifier.java

/**
 * 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.uniquecount;

import java.util.HashMap;
import java.util.Map;

import com.datatorrent.api.Context;
import com.datatorrent.api.DefaultInputPort;
import com.datatorrent.api.DefaultOutputPort;
import com.datatorrent.api.Operator;
import com.datatorrent.api.annotation.OutputPortFieldAnnotation;
import com.datatorrent.lib.util.KeyHashValPair;

/*
Compare results and print non-matching values to console.
 */
/**
 * <p>CountVerifier class.</p>
 *
 * @since 1.0.2
 */
public class CountVerifier<K> implements Operator
{
  HashMap<K, Integer> map1 = new HashMap<K, Integer>();
  HashMap<K, Integer> map2 = new HashMap<K, Integer>();

  public final transient DefaultInputPort<KeyHashValPair<K, Integer>> in1 = new DefaultInputPort<KeyHashValPair<K, Integer>>()
  {
    @Override
    public void process(KeyHashValPair<K, Integer> tuple)
    {
      processTuple(tuple, map1);
    }
  };

  public final transient DefaultInputPort<KeyHashValPair<K, Integer>> in2 = new DefaultInputPort<KeyHashValPair<K, Integer>>()
  {
    @Override
    public void process(KeyHashValPair<K, Integer> tuple)
    {
      processTuple(tuple, map2);
    }
  };

  void processTuple(KeyHashValPair<K, Integer> tuple, HashMap<K, Integer> map)
  {
    map.put(tuple.getKey(), tuple.getValue());
  }

  @OutputPortFieldAnnotation(optional = true)
  public final transient DefaultOutputPort<Integer> successPort = new DefaultOutputPort<Integer>();
  @OutputPortFieldAnnotation(optional = true)
  public final transient DefaultOutputPort<Integer> failurePort = new DefaultOutputPort<Integer>();

  @Override
  public void beginWindow(long l)
  {

  }

  @Override
  public void endWindow()
  {
    int failureCount = 0;
    for (Map.Entry<K, Integer> e : map1.entrySet()) {
      K key = e.getKey();
      int val = map2.get(key);
      if (val != e.getValue()) {
        failureCount++;
      }
    }
    if (failureCount != 0) {
      failurePort.emit(failureCount);
    } else {
      successPort.emit(map1.size());
    }
  }

  @Override
  public void setup(Context.OperatorContext operatorContext)
  {

  }

  @Override
  public void teardown()
  {

  }
}