| /* |
| * 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 kafka.examples; |
| |
| import kafka.utils.ShutdownableThread; |
| import org.apache.kafka.clients.consumer.ConsumerConfig; |
| import org.apache.kafka.clients.consumer.ConsumerRecord; |
| import org.apache.kafka.clients.consumer.ConsumerRecords; |
| import org.apache.kafka.clients.consumer.KafkaConsumer; |
| |
| import java.time.Duration; |
| import java.util.Collections; |
| import java.util.Properties; |
| |
| public class Consumer extends ShutdownableThread { |
| private final KafkaConsumer<Integer, String> consumer; |
| private final String topic; |
| |
| public Consumer(String topic) { |
| super("KafkaConsumerExample", false); |
| Properties props = new Properties(); |
| props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, KafkaProperties.KAFKA_SERVER_URL + ":" + KafkaProperties.KAFKA_SERVER_PORT); |
| props.put(ConsumerConfig.GROUP_ID_CONFIG, "DemoConsumer"); |
| props.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, "true"); |
| props.put(ConsumerConfig.AUTO_COMMIT_INTERVAL_MS_CONFIG, "1000"); |
| props.put(ConsumerConfig.SESSION_TIMEOUT_MS_CONFIG, "30000"); |
| props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.IntegerDeserializer"); |
| props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer"); |
| |
| consumer = new KafkaConsumer<>(props); |
| this.topic = topic; |
| } |
| |
| @Override |
| public void doWork() { |
| consumer.subscribe(Collections.singletonList(this.topic)); |
| ConsumerRecords<Integer, String> records = consumer.poll(Duration.ofSeconds(1)); |
| for (ConsumerRecord<Integer, String> record : records) { |
| System.out.println("Received message: (" + record.key() + ", " + record.value() + ") at offset " + record.offset()); |
| } |
| } |
| |
| @Override |
| public String name() { |
| return null; |
| } |
| |
| @Override |
| public boolean isInterruptible() { |
| return false; |
| } |
| } |