samples/src/main/java/com/datatorrent/samples/lib/math/RandomPairIntegers.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 com.datatorrent.samples.lib.math;

import java.util.Random;

import com.datatorrent.api.DefaultOutputPort;
import com.datatorrent.api.InputOperator;
import com.datatorrent.api.Context.OperatorContext;
import com.datatorrent.common.util.Pair;

/**
 * Input port operator for generating random values Pair for sample application.
 *
 * @since 0.3.2
 */
public class RandomPairIntegers implements InputOperator
{

	public final transient DefaultOutputPort<Pair<Integer, Integer>> outport = new DefaultOutputPort<Pair<Integer, Integer>>();
	private Random random = new Random(11111);
	private boolean equal = false;

	@Override
	public void beginWindow(long windowId)
	{
		// TODO Auto-generated method stub

	}

	@Override
	public void endWindow()
	{
		// TODO Auto-generated method stub

	}

	@Override
	public void setup(OperatorContext context)
	{
		// TODO Auto-generated method stub

	}

	@Override
	public void teardown()
	{
		// TODO Auto-generated method stub

	}

	@Override
	public void emitTuples()
	{
		if (equal)
		{
			int val = random.nextInt();
			outport.emit(new Pair<Integer, Integer>(new Integer(val),
					new Integer(val)));
		} else
		{
			outport.emit(new Pair<Integer, Integer>(new Integer(random.nextInt()),
					new Integer(random.nextInt())));
		}
		equal = !equal;
	}

}