statefun-examples/statefun-ridesharing-example/statefun-ridesharing-example-simulator/src/main/java/org/apache/flink/statefun/examples/ridesharing/simulator/configurations/KafkaConsumerConfig.java

/*
 * 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.flink.statefun.examples.ridesharing.simulator.configurations;

import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.common.serialization.ByteArrayDeserializer;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.kafka.annotation.EnableKafka;
import org.springframework.kafka.config.ConcurrentKafkaListenerContainerFactory;
import org.springframework.kafka.config.KafkaListenerContainerFactory;
import org.springframework.kafka.core.ConsumerFactory;
import org.springframework.kafka.core.DefaultKafkaConsumerFactory;
import org.springframework.kafka.listener.ConcurrentMessageListenerContainer;

@EnableKafka
@Configuration
public class KafkaConsumerConfig {
  private final String bootstrapServer;

  public KafkaConsumerConfig(@Value("${kafka.bootstrap-servers}") String bootstrapServer) {
    this.bootstrapServer = Objects.requireNonNull(bootstrapServer);
  }

  @Bean
  public ConsumerFactory<String, String> consumerFactory() {
    Map<String, Object> props = new HashMap<>();
    props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServer);
    props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, ByteArrayDeserializer.class);
    props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, ByteArrayDeserializer.class);
    props.put(ConsumerConfig.GROUP_ID_CONFIG, "simulator-java.group");
    props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "latest");
    return new DefaultKafkaConsumerFactory<>(props);
  }

  @Bean
  public KafkaListenerContainerFactory<ConcurrentMessageListenerContainer<String, String>>
      kafkaListenerContainerFactory(ConsumerFactory<String, String> consumerFactory) {
    ConcurrentKafkaListenerContainerFactory<String, String> factory =
        new ConcurrentKafkaListenerContainerFactory<>();
    factory.setConsumerFactory(consumerFactory);
    return factory;
  }
}