library/src/test/java/com/datatorrent/lib/math/MarginMapTest.java

/*
 * Copyright (c) 2013 DataTorrent, Inc. ALL Rights Reserved.
 *
 * Licensed 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.lib.math;

import java.util.HashMap;
import java.util.Map;

import org.junit.Assert;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.datatorrent.lib.testbench.CountAndLastTupleTestSink;

/**
 * 
 * Functional tests for {@link com.datatorrent.lib.math.MarginMap}
 * <p>
 * 
 */
public class MarginMapTest
{
	private static Logger LOG = LoggerFactory.getLogger(MarginMapTest.class);

	/**
	 * Test node logic emits correct results
	 */
	@Test
	public void testNodeProcessing() throws Exception
	{
		testNodeProcessingSchema(new MarginMap<String, Integer>());
		testNodeProcessingSchema(new MarginMap<String, Double>());
		testNodeProcessingSchema(new MarginMap<String, Float>());
		testNodeProcessingSchema(new MarginMap<String, Short>());
		testNodeProcessingSchema(new MarginMap<String, Long>());
	}

	@SuppressWarnings({ "unchecked", "rawtypes" })
	public void testNodeProcessingSchema(MarginMap oper)
	{
		CountAndLastTupleTestSink marginSink = new CountAndLastTupleTestSink();

		oper.margin.setSink(marginSink);

		oper.beginWindow(0);
		HashMap<String, Number> input = new HashMap<String, Number>();
		input.put("a", 2);
		input.put("b", 20);
		input.put("c", 1000);
		oper.numerator.process(input);

		input.clear();
		input.put("a", 2);
		input.put("b", 40);
		input.put("c", 500);
		oper.denominator.process(input);

		oper.endWindow();

		// One for each key
		Assert.assertEquals("number emitted tuples", 1, marginSink.count);

		HashMap<String, Number> output = (HashMap<String, Number>) marginSink.tuple;
		for (Map.Entry<String, Number> e : output.entrySet()) {
			LOG.debug(String.format("Key, value is %s,%f", e.getKey(), e.getValue()
					.doubleValue()));
			if (e.getKey().equals("a")) {
				Assert.assertEquals("emitted value for 'a' was ", new Double(0), e
						.getValue().doubleValue(), 0);
			} else if (e.getKey().equals("b")) {
				Assert.assertEquals("emitted tuple for 'b' was ", new Double(0.5), e
						.getValue().doubleValue(), 0);
			} else if (e.getKey().equals("c")) {
				Assert.assertEquals("emitted tuple for 'c' was ", new Double(-1.0), e
						.getValue().doubleValue(), 0);
			} else {
				LOG.debug(String.format("key was %s", e.getKey()));
			}
		}
	}
}