Github user hmcl commented on a diff in the pull request: https://github.com/apache/storm/pull/1808#discussion_r96717295 --- Diff: external/storm-kafka-client/src/main/java/org/apache/storm/kafka/bolt/KafkaBolt.java --- @@ -0,0 +1,196 @@ +/** + * 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.bolt; + +import org.apache.storm.task.OutputCollector; +import org.apache.storm.task.TopologyContext; +import org.apache.storm.topology.OutputFieldsDeclarer; +import org.apache.storm.topology.base.BaseRichBolt; +import org.apache.storm.tuple.Tuple; +import org.apache.storm.utils.TupleUtils; +import org.apache.kafka.clients.producer.KafkaProducer; +import org.apache.kafka.clients.producer.ProducerRecord; +import org.apache.kafka.clients.producer.RecordMetadata; +import org.apache.kafka.clients.producer.Callback; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; +import org.apache.storm.kafka.bolt.mapper.FieldNameBasedTupleToKafkaMapper; +import org.apache.storm.kafka.bolt.mapper.TupleToKafkaMapper; +import org.apache.storm.kafka.bolt.selector.DefaultTopicSelector; +import org.apache.storm.kafka.bolt.selector.KafkaTopicSelector; +import java.util.concurrent.Future; +import java.util.concurrent.ExecutionException; +import java.util.Map; +import java.util.Properties; + + +/** + * Bolt implementation that can send Tuple data to Kafka + * <p/> + * It expects the producer configuration and topic in storm config under + * <p/> + * 'kafka.broker.properties' and 'topic' + * <p/> + * respectively. + */ +public class KafkaBolt<K, V> extends BaseRichBolt { + private static final long serialVersionUID = -5205886631877033478L; + + private static final Logger LOG = LoggerFactory.getLogger(KafkaBolt.class); + + public static final String TOPIC = "topic"; + + private KafkaProducer<K, V> producer; + private OutputCollector collector; + private TupleToKafkaMapper<K,V> mapper; + private KafkaTopicSelector topicSelector; + private Properties boltSpecfiedProperties = new Properties(); + private boolean fireAndForget = false; + private boolean async = true; + + public KafkaBolt() {} + + public KafkaBolt<K,V> withTupleToKafkaMapper(TupleToKafkaMapper<K,V> mapper) { + this.mapper = mapper; + return this; + } + + public KafkaBolt<K, V> withTopicSelector(String topic) { + return withTopicSelector(new DefaultTopicSelector(topic)); + } + + public KafkaBolt<K,V> withTopicSelector(KafkaTopicSelector selector) { + this.topicSelector = selector; + return this; + } + + public KafkaBolt<K,V> withProducerProperties(Properties producerProperties) { --- End diff -- Is this method intended to set KafkaProducerProperties only? If so, wouldn't it be beneficial to call this method `withKafkaProducerProps`?
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