examples/parser/src/main/java/org/apache/apex/examples/parser/jsonparser/JsonGenerator.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.parser.jsonparser;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Random;

import javax.validation.constraints.Min;

import org.codehaus.jettison.json.JSONException;
import org.codehaus.jettison.json.JSONObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.datatorrent.api.DefaultOutputPort;
import com.datatorrent.api.InputOperator;
import com.datatorrent.common.util.BaseOperator;

/**
 * @since 3.7.0
 */
public class JsonGenerator extends BaseOperator implements InputOperator
{

  private static final Logger LOG = LoggerFactory.getLogger(JsonGenerator.class);

  @Min(1)
  private int numTuples = 20;
  private transient int count = 0;

  public static Random rand = new Random();
  public static SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd");
  public static int[] adId = {1, 2, 3, 4, 5};
  public static String[] campaignName = {"cmp1", "cmp2", "cmp3", "cmp4"};
  public static double[] campaignBudget = {10000.0, 20000.0, 300000.0};
  public static boolean[] weatherTargeting = {true, false};
  private int sleepTime;

  public final transient DefaultOutputPort<byte[]> out = new DefaultOutputPort<byte[]>();

  private static String getNext(int num)
  {

    JSONObject obj = new JSONObject();
    try {
      obj.put("adId", adId[num % adId.length]);
      obj.put("campaignName", campaignName[num % campaignName.length]);
      obj.put("campaignBudget", campaignBudget[num % campaignBudget.length]);
      obj.put("weatherTargeting", weatherTargeting[num % weatherTargeting.length]);
      obj.put("startDate", sdf.format(new Date()));
    } catch (JSONException e) {
      return null;
    }
    return obj.toString();
  }

  @Override
  public void beginWindow(long windowId)
  {
    count = 0;
  }

  @Override
  public void emitTuples()
  {
    if (count++ < numTuples) {
      out.emit(getNext(rand.nextInt(numTuples) + 1).getBytes());
    } else {
      try {
        Thread.sleep(sleepTime);
      } catch (InterruptedException e) {
        LOG.info("Sleep interrupted");
      }
    }
  }

  public int getNumTuples()
  {
    return numTuples;
  }

  public void setNumTuples(int numTuples)
  {
    this.numTuples = numTuples;
  }

}