| /* |
| * 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.storm.kafka.trident; |
| |
| import org.apache.kafka.clients.producer.ProducerConfig; |
| import org.apache.storm.generated.StormTopology; |
| import org.apache.storm.kafka.bolt.KafkaBolt; |
| import org.apache.storm.kafka.bolt.mapper.FieldNameBasedTupleToKafkaMapper; |
| import org.apache.storm.kafka.bolt.selector.DefaultTopicSelector; |
| import org.apache.storm.starter.spout.RandomSentenceSpout; |
| import org.apache.storm.topology.TopologyBuilder; |
| |
| import java.util.Properties; |
| |
| public class KafkaProducerTopology { |
| /** |
| * @param brokerUrl Kafka broker URL |
| * @param topicName Topic to which publish sentences |
| * @return A Storm topology that produces random sentences using {@link RandomSentenceSpout} and uses a {@link KafkaBolt} to |
| * publish the sentences to the kafka topic specified |
| */ |
| public static StormTopology newTopology(String brokerUrl, String topicName) { |
| final TopologyBuilder builder = new TopologyBuilder(); |
| builder.setSpout("spout", new RandomSentenceSpout.TimeStamped(""), 2); |
| |
| /* The output field of the RandomSentenceSpout ("word") is provided as the boltMessageField |
| so that this gets written out as the message in the kafka topic. */ |
| final KafkaBolt<String, String> bolt = new KafkaBolt<String, String>() |
| .withProducerProperties(newProps(brokerUrl, topicName)) |
| .withTopicSelector(new DefaultTopicSelector(topicName)) |
| .<String, String>withTupleToKafkaMapper(new FieldNameBasedTupleToKafkaMapper<String,String>("key", "word")); |
| |
| builder.setBolt("forwardToKafka", bolt, 1).shuffleGrouping("spout"); |
| |
| return builder.createTopology(); |
| } |
| |
| /** |
| * @return the Storm config for the topology that publishes sentences to kafka using a kafka bolt. |
| */ |
| private static Properties newProps(final String brokerUrl, final String topicName) { |
| return new Properties() {{ |
| put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, brokerUrl); |
| put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringSerializer"); |
| put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringSerializer"); |
| put(ProducerConfig.CLIENT_ID_CONFIG, topicName); |
| }}; |
| } |
| } |
| |
| |