pulsar-client-kafka-compat/pulsar-client-kafka-tests/src/test/java/org/apache/pulsar/client/kafka/compat/examples/ConsumerExample.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
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package org.apache.pulsar.client.kafka.compat.examples;

import java.util.Arrays;
import java.util.Properties;

import org.apache.kafka.clients.consumer.Consumer;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.common.serialization.IntegerDeserializer;
import org.apache.kafka.common.serialization.StringDeserializer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ConsumerExample {
    public static void main(String[] args) {
        String topic = "persistent://sample/standalone/ns/my-topic";

        Properties props = new Properties();
        props.put("bootstrap.servers", "pulsar://localhost:6650");
        props.put("group.id", "my-subscription-name");
        props.put("enable.auto.commit", "false");
        props.put("key.deserializer", IntegerDeserializer.class.getName());
        props.put("value.deserializer", StringDeserializer.class.getName());

        Consumer<Integer, String> consumer = new KafkaConsumer<>(props);
        consumer.subscribe(Arrays.asList(topic));

        while (true) {
            ConsumerRecords<Integer, String> records = consumer.poll(100);
            records.forEach(record -> {
                log.info("Received record: {}", record);
            });

            // Commit last offset
            consumer.commitSync();
        }
    }

    private static final Logger log = LoggerFactory.getLogger(ConsumerExample.class);
}