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KAFKA-2487: change kafka.examples.Consumer to use the new java consumer #297

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KAFKA-2487: change kafka.examples.Consumer to use the new java consumer #297

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KAFKA-2487: change kafka.examples.Consumer to use the new java consumer
Sep 11, 2015
f6ea3c7
Address review comments. 1. Extend ShutdownableThread instead of Thre…
Oct 15, 2015
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72 changes: 36 additions & 36 deletions examples/src/main/java/kafka/examples/Consumer.java
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Expand Up @@ -16,52 +16,52 @@
*/
package kafka.examples;


import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Collections;
import java.util.Properties;
import kafka.consumer.ConsumerConfig;
import kafka.consumer.KafkaStream;
import kafka.javaapi.consumer.ConsumerConnector;
import kafka.message.MessageAndMetadata;

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;

public class Consumer extends Thread
public class Consumer extends ShutdownableThread
{
private final ConsumerConnector consumer;
private final KafkaConsumer<Integer, String> consumer;
private final String topic;

public Consumer(String topic)
{
consumer = kafka.consumer.Consumer.createJavaConsumerConnector(
createConsumerConfig());
super("KafkaConsumerExample", false);
Properties props = new Properties();
props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
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;
}

private static ConsumerConfig createConsumerConfig()
{
Properties props = new Properties();
props.put("zookeeper.connect", KafkaProperties.zkConnect);
props.put("group.id", KafkaProperties.groupId);
props.put("zookeeper.session.timeout.ms", "400");
props.put("zookeeper.sync.time.ms", "200");
props.put("auto.commit.interval.ms", "1000");

return new ConsumerConfig(props);
@Override
public void doWork() {
consumer.subscribe(Collections.singletonList(this.topic));
ConsumerRecords<Integer, String> records = consumer.poll(1000);
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;
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@guozhangwang guozhangwang Oct 16, 2015

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This is because we are inheriting a Scala class, and moving forward we should remove this with the Java version

org.apache.kafka.copycat.util.ShutdownableThread that can be moved into o.a.k.common.utils.

We can leave it as is for now.

}

public void run() {
Map<String, Integer> topicCountMap = new HashMap<String, Integer>();
topicCountMap.put(topic, 1);
Map<String, List<KafkaStream<byte[], byte[]>>> consumerMap = consumer.createMessageStreams(topicCountMap);
KafkaStream<byte[], byte[]> stream = consumerMap.get(topic).get(0);
for (MessageAndMetadata<byte[], byte[]> messageAndMetadata : stream) {
System.out.println("Received message: (" + ByteBuffer.wrap(messageAndMetadata.key()).getInt() +
", " +
"" + new String(messageAndMetadata.message()) + ")");
}

@Override
public boolean isInterruptible() {
return false;
}
}
}