ApsaraMQ for Kafka:Schema Registry を使用したスキーマ管理

import io.confluent.kafka.serializers.AbstractKafkaSchemaSerDeConfig;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerConfig;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.apache.kafka.common.serialization.StringSerializer;
import io.confluent.kafka.serializers.KafkaAvroSerializer;
import org.apache.kafka.common.errors.SerializationException;

import java.util.Properties;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.io.FileInputStream;
import java.io.InputStream;

public class ProducerExample {

    private static final String TOPIC = "transactions";
    private static final Properties props = new Properties();
    private static String configFile;

    @SuppressWarnings("InfiniteLoopStatement")
    public static void main(final String[] args) throws IOException {

        if (args.length < 1) {
            // 後方互換性のため、localhost を想定
            props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
            props.put(AbstractKafkaSchemaSerDeConfig.SCHEMA_REGISTRY_URL_CONFIG, "http://localhost:8081");
        } else {
            // 設定ファイルからプロパティを読み込む
            configFile = args[0];
            if (!Files.exists(Paths.get(configFile))) {
                throw new IOException(configFile + " が見つかりません。");
            } else {
                try (InputStream inputStream = new FileInputStream(configFile)) {
                    props.load(inputStream);
                }
            }
        }

        props.put(ProducerConfig.ACKS_CONFIG, "all");
        props.put(ProducerConfig.RETRIES_CONFIG, 0);
        props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
        props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, KafkaAvroSerializer.class);

        try (KafkaProducer<String, Payment> producer = new KafkaProducer<String, Payment>(props)) {

            for (long i = 0; i < 10; i++) {
                final String orderId = "id" + Long.toString(i);
                final Payment payment = new Payment(orderId, 1000.00d);
                final ProducerRecord<String, Payment> record = new ProducerRecord<String, Payment>(TOPIC, payment.getId().toString(), payment);
                producer.send(record);
                Thread.sleep(1000L);
            }

            producer.flush();
            System.out.printf("トピック %s に正常に 10 件のメッセージを生成しました%n", TOPIC);

        } catch (final SerializationException e) {
            e.printStackTrace();
        } catch (final InterruptedException e) {
            e.printStackTrace();
        }

    }

}

import io.confluent.kafka.serializers.AbstractKafkaSchemaSerDeConfig;
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 io.confluent.kafka.serializers.KafkaAvroDeserializer;
import io.confluent.kafka.serializers.KafkaAvroDeserializerConfig;
import org.apache.kafka.common.serialization.StringDeserializer;

import java.time.Duration;
import java.util.Collections;
import java.util.Properties;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.io.FileInputStream;
import java.io.InputStream;

public class ConsumerExample {

    private static final String TOPIC = "transactions";
    private static final Properties props = new Properties();
    private static String configFile;

    @SuppressWarnings("InfiniteLoopStatement")
    public static void main(final String[] args) throws IOException {

        if (args.length < 1) {
            // 後方互換性のため、localhost を想定
            props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
            props.put(AbstractKafkaSchemaSerDeConfig.SCHEMA_REGISTRY_URL_CONFIG, "http://localhost:8081");
        } else {
            // 設定ファイルからプロパティを読み込む
            configFile = args[0];
            if (!Files.exists(Paths.get(configFile))) {
                throw new IOException(configFile + " が見つかりません。");
            } else {
                try (InputStream inputStream = new FileInputStream(configFile)) {
                    props.load(inputStream);
                }
            }
        }

        props.put(ConsumerConfig.GROUP_ID_CONFIG, "test-payments");
        props.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, "true");
        props.put(ConsumerConfig.AUTO_COMMIT_INTERVAL_MS_CONFIG, "1000");
        props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
        props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
        props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, KafkaAvroDeserializer.class);
        props.put(KafkaAvroDeserializerConfig.SPECIFIC_AVRO_READER_CONFIG, true);

        try (final KafkaConsumer<String, Payment> consumer = new KafkaConsumer<>(props)) {
            consumer.subscribe(Collections.singletonList(TOPIC));

            while (true) {
                final ConsumerRecords<String, Payment> records = consumer.poll(Duration.ofMillis(100));
                for (final ConsumerRecord<String, Payment> record : records) {
                    final String key = record.key();
                    final Payment value = record.value();
                    System.out.printf("key = %s, value = %s%n", key, value);
                }
            }

        }
    }

}