pulsar-io/kafka/src/main/java/org/apache/pulsar/io/kafka/KafkaBytesSource.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.pulsar.io.kafka;

import java.util.Properties;
import lombok.extern.slf4j.Slf4j;
import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.common.serialization.ByteArrayDeserializer;
import org.apache.kafka.common.serialization.StringDeserializer;
import org.apache.pulsar.io.core.annotations.Connector;
import org.apache.pulsar.io.core.annotations.IOType;

/**
 * Simple Kafka Source that just transfers the value part of the kafka records
 * as Strings
 */
@Connector(
    name = "kafka",
    type = IOType.SOURCE,
    help = "The KafkaBytesSource is used for moving messages from Kafka to Pulsar.",
    configClass = KafkaSourceConfig.class
)
@Slf4j
public class KafkaBytesSource extends KafkaAbstractSource<byte[]> {

    @Override
    protected Properties beforeCreateConsumer(Properties props) {
        props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
        props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, ByteArrayDeserializer.class.getName());
        log.info("Created kafka consumer config : {}", props);
        return props;
    }

    @Override
    public byte[] extractValue(ConsumerRecord<String, byte[]> record) {
        return record.value();
    }
}