KafkaWriterTests.java

/**
 * The MIT License
 * Copyright © 2010 JmxTrans team
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.googlecode.jmxtrans.model.output.kafka;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import kafka.javaapi.producer.Producer;
import kafka.producer.KeyedMessage;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.ArgumentCaptor;
import org.mockito.Captor;
import org.mockito.Mock;
import org.mockito.runners.MockitoJUnitRunner;

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

import static com.googlecode.jmxtrans.model.QueryFixtures.dummyQuery;
import static com.googlecode.jmxtrans.model.ResultFixtures.singleNumericResult;
import static com.googlecode.jmxtrans.model.ServerFixtures.dummyServer;
import static org.assertj.core.api.Assertions.assertThat;
import static org.mockito.Mockito.verify;

@RunWith(MockitoJUnitRunner.class)
public class KafkaWriterTests {

	@Mock private Producer<String, String> producer;
	@Captor private ArgumentCaptor<KeyedMessage<String, String>> messageCaptor;

	@Test public void
	kafkaWriterNotNull() throws Exception {
		assertThat(getTestKafkaWriter()).isNotNull();
	}

	@Test public void
	messagesAreSentToKafka() throws Exception {
		KafkaWriter writer = getTestKafkaWriter();
		writer.setProducer(producer);
		writer.doWrite(dummyServer(), dummyQuery(), singleNumericResult());

		verify(producer).send(messageCaptor.capture());
		KeyedMessage<String, String> message = messageCaptor.getValue();

		assertThat(message.topic()).isEqualTo("myTopic");
		assertThat(message.message())
				.contains("\"keyspace\":\"rootPrefix.host_example_net_4321.MemoryAlias.ObjectPendingFinalizationCount\"")
				.contains("\"value\":\"10\"")
				.contains("\"timestamp\":0")
				.contains("\"tags\":{\"myTagKey1\":\"myTagValue1\"");
	}
	
	private static KafkaWriter getTestKafkaWriter() {
		ImmutableList typenames = ImmutableList.of();
		Map<String,Object> settings = new HashMap<String,Object>();
		ImmutableMap<String, String> tags = ImmutableMap.of("myTagKey1", "myTagValue1"); 
		settings.put("zk.connect", "host:2181");
		settings.put("metadata.broker.list", "10.231.1.1:9180");
		settings.put("serializer.class", "kafka.serializer.StringEncoder");
		settings.put("debug", false);
		settings.put("booleanAsNumber", true);
		settings.put("topics", "myTopic");
		return new KafkaWriter(typenames, true, "rootPrefix", true, "myTopic", tags, settings);
	}
	
}