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.distributeddistinct;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import org.apache.apex.malhar.lib.util.KeyValPair;
  
  import com.datatorrent.api.Context.OperatorContext;
  import com.datatorrent.api.DefaultInputPort;
  import com.datatorrent.api.DefaultOutputPort;
  import com.datatorrent.api.Operator;
  import com.datatorrent.api.annotation.OutputPortFieldAnnotation;
  
  /**
   * An operator that takes two streams of Integer to Integer KeyValPairs and verifies that the two streams output the
   * same KeyValPairs within a given window.
   *
   * @since 1.0.4
   */
  public class CountVerifier implements Operator
  {
    Map<Integer, Integer> trueCount = new HashMap<Integer, Integer>();
    Map<Integer, Integer> receivedCount = new HashMap<Integer, Integer>();
  
    public final transient DefaultInputPort<KeyValPair<Integer, Integer>> trueIn = new DefaultInputPort<KeyValPair<Integer, Integer>>()
    {
      @Override
      public void process(KeyValPair<Integer, Integer> tuple)
      {
        trueCount.put(tuple.getKey(), tuple.getValue());
      }
    };
  
    public final transient DefaultInputPort<KeyValPair<Integer, Integer>> recIn = new DefaultInputPort<KeyValPair<Integer, Integer>>()
    {
      @Override
      public void process(KeyValPair<Integer, Integer> tuple)
      {
        receivedCount.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 setup(OperatorContext arg0)
    {
  
    }
  
    @Override
    public void teardown()
    {
  
    }
  
    @Override
    public void beginWindow(long windowID)
    {
    }
  
    /**
     * Checks that the key to value pairs are the same and counts the number of pairs that are different. If there are
     * failures, it will emit the number of failures to the failure port. Otherwise, it will emit the number of keys to
     * the success port.
     */
    @Override
    public void endWindow()
    {
      int failureCount = 0;
      for (Map.Entry<Integer, Integer> e : receivedCount.entrySet()) {
        Integer key = e.getKey();
        if (!trueCount.get(key).equals(e.getValue())) {
          failureCount++;
        }
      }
      if (failureCount != 0) {
        failurePort.emit(failureCount);
      } else {
        successPort.emit(trueCount.size());
      }
    }
  }
  