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.machinedata.operator;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import org.apache.apex.examples.machinedata.data.AverageData;
  import org.apache.apex.examples.machinedata.data.MachineKey;
  import org.apache.apex.malhar.lib.util.KeyHashValPair;
  
  import com.datatorrent.api.Context.OperatorContext;
  import com.datatorrent.api.DefaultOutputPort;
  import com.datatorrent.api.Operator.Unifier;
  
  /**
   * This class calculates the partial sum and count for a given key
   * <p>MachineInfoAveragingUnifier class.</p>
   *
   * @since 0.9.0
   */
  public class MachineInfoAveragingUnifier implements Unifier<KeyHashValPair<MachineKey, AverageData>>
  {
  
    private Map<MachineKey, AverageData> sums = new HashMap<>();
    public final transient DefaultOutputPort<KeyHashValPair<MachineKey, AverageData>> outputPort = new DefaultOutputPort<>();
  
    @Override
    public void beginWindow(long arg0)
    {
      // TODO Auto-generated method stub
  
    }
  
    @Override
    public void endWindow()
    {
      for (Map.Entry<MachineKey, AverageData> entry : sums.entrySet()) {
        outputPort.emit(new KeyHashValPair<>(entry.getKey(), entry.getValue()));
      }
      sums.clear();
  
    }
  
    @Override
    public void setup(OperatorContext arg0)
    {
      // TODO Auto-generated method stub
  
    }
  
    @Override
    public void teardown()
    {
      // TODO Auto-generated method stub
  
    }
  
    @Override
    public void process(KeyHashValPair<MachineKey, AverageData> arg0)
    {
      MachineKey tupleKey = arg0.getKey();
      AverageData averageData = sums.get(tupleKey);
      AverageData tupleValue = arg0.getValue();
      if (averageData == null) {
        sums.put(tupleKey, tupleValue);
      } else {
        averageData.setCpu(averageData.getCpu() + tupleValue.getCpu());
        averageData.setRam(averageData.getRam() + tupleValue.getRam());
        averageData.setHdd(averageData.getHdd() + tupleValue.getHdd());
        averageData.setCount(averageData.getCount() + tupleValue.getCount());
      }
    }
  
  }
  