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.uniquecount;
  
  import java.util.Date;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Random;
  
  import org.apache.apex.malhar.lib.util.KeyHashValPair;
  import org.apache.commons.lang3.mutable.MutableInt;
  
  import com.datatorrent.api.Context;
  import com.datatorrent.api.DefaultOutputPort;
  import com.datatorrent.api.InputOperator;
  import com.datatorrent.api.annotation.OutputPortFieldAnnotation;
  
  /*
      Generate random keys.
   */
  /**
   * <p>RandomKeysGenerator class.</p>
   *
   * @since 1.0.2
   */
  public class RandomKeysGenerator implements InputOperator
  {
  
    protected int numKeys = 100;
    protected int tupleBlast = 15000;
    protected long sleepTime = 0;
    protected Map<Integer, MutableInt> history = new HashMap<Integer, MutableInt>();
    private Random random = new Random();
    private Date date = new Date();
    private long start;
  
    @OutputPortFieldAnnotation(optional = false)
    public transient DefaultOutputPort<Integer> outPort = new DefaultOutputPort<Integer>();
  
    @OutputPortFieldAnnotation(optional = true)
    public transient DefaultOutputPort<KeyHashValPair<Integer, Integer>> verificationPort =
        new DefaultOutputPort<KeyHashValPair<Integer, Integer>>();
  
    @Override
    public void emitTuples()
    {
      for (int i = 0; i < tupleBlast; i++) {
        int key = random.nextInt(numKeys);
        outPort.emit(key);
  
  
        if (verificationPort.isConnected()) {
          // maintain history for later verification.
          MutableInt count = history.get(key);
          if (count == null) {
            count = new MutableInt(0);
            history.put(key, count);
          }
          count.increment();
        }
  
      }
      try {
        if (sleepTime != 0) {
          Thread.sleep(sleepTime);
        }
      } catch (Exception ex) {
        // Ignore.
      }
    }
  
    public RandomKeysGenerator()
    {
      start = date.getTime();
    }
  
    @Override
    public void beginWindow(long l)
    {
  
    }
  
    @Override
    public void endWindow()
    {
  
      if (verificationPort.isConnected()) {
        for (Map.Entry<Integer, MutableInt> e : history.entrySet()) {
          verificationPort.emit(new KeyHashValPair<Integer, Integer>(e.getKey(), e.getValue().toInteger()));
        }
        history.clear();
      }
  
    }
  
    @Override
    public void setup(Context.OperatorContext operatorContext)
    {
  
    }
  
    @Override
    public void teardown()
    {
  
    }
  
    public int getNumKeys()
    {
      return numKeys;
    }
  
    public void setNumKeys(int numKeys)
    {
      this.numKeys = numKeys;
    }
  
    public int getTupleBlast()
    {
      return tupleBlast;
    }
  
    public void setTupleBlast(int tupleBlast)
    {
      this.tupleBlast = tupleBlast;
    }
  
    public long getSleepTime()
    {
      return sleepTime;
    }
  
    public void setSleepTime(long sleepTime)
    {
      this.sleepTime = sleepTime;
    }
  }
  