| /** |
| * 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.contrib.kafka; |
| |
| import java.util.Properties; |
| import java.util.concurrent.*; |
| |
| import org.junit.Assert; |
| import org.junit.Test; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.datatorrent.api.Context.OperatorContext; |
| import com.datatorrent.api.DAG; |
| import com.datatorrent.api.DAG.Locality; |
| import com.datatorrent.api.DefaultOutputPort; |
| import com.datatorrent.api.InputOperator; |
| import com.datatorrent.api.LocalMode; |
| import com.datatorrent.api.Operator.ActivationListener; |
| |
| import com.datatorrent.common.util.Pair; |
| |
| /** |
| * |
| */ |
| public class KafkaExactlyOnceOutputOperatorTest extends KafkaOperatorTestBase |
| { |
| private static final Logger logger = LoggerFactory.getLogger(KafkaExactlyOnceOutputOperatorTest.class); |
| private static final int maxTuple = 40; |
| private static CountDownLatch latch; |
| private static boolean isRestarted = false; |
| |
| /** |
| * Tuple generator for testing. |
| */ |
| public static class StringGeneratorInputOperator implements InputOperator, ActivationListener<OperatorContext> |
| { |
| public final transient DefaultOutputPort<String> outputPort = new DefaultOutputPort<String>(); |
| private final transient ArrayBlockingQueue<String> stringBuffer = new ArrayBlockingQueue<String>(1024); |
| private volatile Thread dataGeneratorThread; |
| |
| @Override |
| public void beginWindow(long windowId) |
| { |
| } |
| |
| @Override |
| public void endWindow() |
| { |
| } |
| |
| @Override |
| public void setup(OperatorContext context) |
| { |
| |
| } |
| |
| @Override |
| public void teardown() |
| { |
| } |
| |
| @Override |
| public void activate(OperatorContext ctx) |
| { |
| dataGeneratorThread = new Thread("String Generator") |
| { |
| @Override |
| public void run() |
| { |
| try { |
| int i = 0; |
| while (dataGeneratorThread != null && i < maxTuple) { |
| stringBuffer.put((++i) + "###testString " + i); |
| } |
| stringBuffer.put((maxTuple + 1) + "###" + KafkaOperatorTestBase.END_TUPLE); |
| } |
| catch (InterruptedException ie) { |
| } |
| } |
| }; |
| dataGeneratorThread.start(); |
| } |
| |
| @Override |
| public void deactivate() |
| { |
| dataGeneratorThread = null; |
| } |
| |
| @Override |
| public void emitTuples() |
| { |
| for (int i = stringBuffer.size(); i-- > 0;) { |
| if (i == 20 && isRestarted == false) { |
| isRestarted = true; |
| // fail the operator and when it gets back resend everything |
| throw new RuntimeException(); |
| } |
| outputPort.emit(stringBuffer.poll()); |
| } |
| } |
| } // End of StringGeneratorInputOperator |
| |
| /** |
| * Test AbstractKafkaExactOnceOutputOperator (i.e. an output adapter for Kafka, aka producer). |
| * This module sends data into a Kafka message bus. |
| * |
| * [Generate tuple] ==> [send tuple through Kafka output adapter(i.e. producer) into Kafka message bus](fail the producer at certain point and bring it back) |
| * ==> [receive data in outside Kafka listener (i.e consumer)] ==> Verify kafka doesn't receive duplicated message |
| * |
| * @throws Exception |
| */ |
| @Test |
| @SuppressWarnings({"rawtypes"}) |
| public void testKafkaExactOnceOutputOperator() throws Exception |
| { |
| //initialize the latch to synchronize the threads |
| latch = new CountDownLatch(maxTuple); |
| // Setup a message listener to receive the message |
| KafkaTestConsumer listener = new KafkaTestConsumer("topic1"); |
| listener.setLatch(latch); |
| |
| // Malhar module to send message |
| // Create DAG for testing. |
| LocalMode lma = LocalMode.newInstance(); |
| final DAG dag = lma.getDAG(); |
| |
| StringGeneratorInputOperator generator = dag.addOperator("TestStringGenerator", StringGeneratorInputOperator.class); |
| final SimpleKafkaExactOnceOutputOperator node = dag.addOperator("Kafka message producer", SimpleKafkaExactOnceOutputOperator.class); |
| |
| Properties props = new Properties(); |
| props.setProperty("serializer.class", "kafka.serializer.StringEncoder"); |
| props.put("metadata.broker.list", "localhost:9092"); |
| props.setProperty("producer.type", "async"); |
| props.setProperty("queue.buffering.max.ms", "200"); |
| props.setProperty("queue.buffering.max.messages", "10"); |
| props.setProperty("batch.num.messages", "5"); |
| |
| node.setConfigProperties(props); |
| // Set configuration parameters for Kafka |
| node.setTopic("topic1"); |
| |
| // Connect ports |
| dag.addStream("Kafka message", generator.outputPort, node.inputPort).setLocality(Locality.CONTAINER_LOCAL); |
| |
| |
| // Create local cluster |
| final LocalMode.Controller lc = lma.getController(); |
| lc.runAsync(); |
| |
| Future f = Executors.newFixedThreadPool(1).submit(listener); |
| f.get(30, TimeUnit.SECONDS); |
| |
| lc.shutdown(); |
| |
| // Check values send vs received |
| Assert.assertEquals("Number of emitted tuples", maxTuple, listener.holdingBuffer.size()); |
| logger.debug(String.format("Number of emitted tuples: %d", listener.holdingBuffer.size())); |
| Assert.assertEquals("First tuple", "testString 1", listener.getMessage(listener.holdingBuffer.peek())); |
| |
| listener.close(); |
| |
| } |
| |
| public static class SimpleKafkaExactOnceOutputOperator extends AbstractExactlyOnceKafkaOutputOperator<String, String, String>{ |
| |
| @Override |
| protected int compareToLastMsg(Pair<String, String> tupleKeyValue, Pair<byte[], byte[]> lastReceivedKeyValue) |
| { |
| return Integer.parseInt(tupleKeyValue.first) - Integer.parseInt(new String(lastReceivedKeyValue.first)); |
| } |
| |
| @Override |
| protected Pair<String, String> tupleToKeyValue(String tuple) |
| { |
| return new Pair<String, String>(tuple.split("###")[0], tuple.split("###")[1]); |
| } |
| |
| } |
| |
| |
| } |