package com.opensoc.dataservices.kafkaclient;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import kafka.consumer.ConsumerConfig;
import kafka.consumer.KafkaStream;
import kafka.javaapi.consumer.ConsumerConnector;
import org.eclipse.jetty.websocket.api.RemoteEndpoint;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class KafkaClient
{
private static final Logger logger = LoggerFactory.getLogger( KafkaClient.class );
private final ConsumerConnector consumer;
private final String topic;
private ExecutorService executor;
private RemoteEndpoint remote;
public KafkaClient(String zooKeeper, String groupId, String topic, RemoteEndpoint remote)
{
this.consumer = kafka.consumer.Consumer.createJavaConsumerConnector(
createConsumerConfig(zooKeeper, groupId ));
this.topic = topic;
this.remote = remote;
}
private static ConsumerConfig createConsumerConfig(String a_zookeeper, String a_groupId) {
Properties props = new Properties();
props.put("zookeeper.connect", a_zookeeper);
props.put("group.id", a_groupId);
props.put("zookeeper.session.timeout.ms", "1000");
props.put("zookeeper.sync.time.ms", "1000");
props.put("auto.commit.interval.ms", "1000");
props.put("auto.offset.reset", "smallest");
return new ConsumerConfig(props);
}
public void shutdown() {
logger.info( "Client shutdown() method invoked" );
if (consumer != null) {
consumer.shutdown();
}
if (executor != null) {
executor.shutdown();
}
}
public void run(int a_numThreads) {
Map<String, Integer> topicCountMap = new HashMap<String, Integer>();
topicCountMap.put(topic, new Integer(a_numThreads));
Map<String, List<KafkaStream<byte[], byte[]>>> consumerMap = consumer.createMessageStreams(topicCountMap);
List<KafkaStream<byte[], byte[]>> streams = consumerMap.get(topic);
logger.debug( "streams.size = " + streams.size() );
// now launch all the threads
//
executor = Executors.newFixedThreadPool(a_numThreads);
// now create an object to consume the messages
//
int threadNumber = 0;
for (final KafkaStream stream : streams) {
executor.submit(new KafkaConsumer(this.remote, stream, threadNumber));
threadNumber++;
}
}
}