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package cn.ac.iie.spout;
import cn.ac.iie.common.RealtimeCountConfig;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.log4j.Logger;
import org.apache.storm.spout.SpoutOutputCollector;
import org.apache.storm.task.TopologyContext;
import org.apache.storm.topology.OutputFieldsDeclarer;
import org.apache.storm.topology.base.BaseRichSpout;
import org.apache.storm.tuple.Fields;
import org.apache.storm.tuple.Values;
import java.util.Arrays;
import java.util.Map;
import java.util.Properties;
public class CustomizedKafkaSpout extends BaseRichSpout{
private static final long serialVersionUID = -3363788553406229592L;
private KafkaConsumer<String, String> consumer;
private SpoutOutputCollector collector = null;
private TopologyContext context = null;
private final static Logger logger = Logger.getLogger(CustomizedKafkaSpout.class);
private static Properties createConsumerConfig() {
Properties props = new Properties();
props.put("bootstrap.servers", RealtimeCountConfig.BOOTSTRAP_SERVERS);
props.put("group.id", RealtimeCountConfig.GROUP_ID_PREFIX+"-rc-"+ RealtimeCountConfig.GROUP_ID);
props.put("auto.offset.reset", RealtimeCountConfig.AUTO_OFFSET_RESET);
props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
return props;
}
@Override
public void open(Map conf, TopologyContext context, SpoutOutputCollector collector) {
// TODO Auto-generated method stub
this.collector=collector;
this.context=context;
Properties prop = createConsumerConfig();
this.consumer = new KafkaConsumer<>(prop);
this.consumer.subscribe(Arrays.asList(RealtimeCountConfig.KAFKA_TOPIC));
}
@Override
public void close() {
consumer.close();
}
@Override
public void nextTuple() {
// TODO Auto-generated method stub
ConsumerRecords<String, String> records = consumer.poll(10000L);
for (ConsumerRecord<String, String> record : records) {
this.collector.emit(new Values(record.value()));
}
}
@Override
public void declareOutputFields(OutputFieldsDeclarer declarer) {
// TODO Auto-generated method stub
declarer.declare(new Fields("source"));
}
}
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