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KafkaState.java
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KafkaState.java
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package com.github.quintona;
import java.io.Serializable;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.ConcurrentLinkedQueue;
import kafka.javaapi.producer.Producer;
import kafka.javaapi.producer.ProducerData;
import kafka.producer.ProducerConfig;
import backtype.storm.task.IMetricsContext;
import storm.trident.state.State;
import storm.trident.state.StateFactory;
public class KafkaState<T> implements State {
ConcurrentLinkedQueue<String> messages = new ConcurrentLinkedQueue<String>();
public static class Options implements Serializable {
public String zookeeperHost = "127.0.0.1";
public int zookeeperPort = 2181;
public String serializerClass = "kafka.serializer.StringEncoder";
public Options(){}
public Options(String zookeeperHost, int zookeeperPort, String serializerClass, String topicName) {
this.zookeeperHost = zookeeperHost;
this.zookeeperPort = zookeeperPort;
this.serializerClass = serializerClass;
}
}
public static StateFactory transactional(String topic, Options options) {
return new Factory(topic, options, true);
}
public static StateFactory nonTransactional(String topic, Options options) {
return new Factory(topic, options, false);
}
protected static class Factory implements StateFactory {
private Options options;
private String topic;
boolean transactional;
public Factory(String topic, Options options, boolean transactional){
this.options = options;
this.topic = topic;
this.transactional = transactional;
}
@Override
public State makeState(Map conf, IMetricsContext metrics,
int partitionIndex, int numPartitions) {
return new KafkaState(topic, options, transactional);
}
}
private Options options;
private String topic;
Producer<String, String> producer;
private boolean transactional;
public KafkaState(String topic, Options options, boolean transactional){
this.topic = topic;
this.options = options;
this.transactional = transactional;
Properties props = new Properties();
props.put("zk.connect", options.zookeeperHost + ":" + Integer.toString(options.zookeeperPort));
props.put("serializer.class", options.serializerClass);
ProducerConfig config = new ProducerConfig(props);
producer = new Producer<String, String>(config);
}
@Override
public void beginCommit(Long txid) {
if(messages.size() > 0)
throw new RuntimeException("Kafka State is invalid, the previous transaction didn't flush");
}
public void enqueue(String message){
if(transactional)
messages.add(message);
else
sendMessage(message);
}
private void sendMessage(String message){
ProducerData<String, String> data = new ProducerData<String, String>(topic, message);
producer.send(data);
}
@Override
public void commit(Long txid) {
String message = messages.poll();
while(message != null){
sendMessage(message);
message = messages.poll();
}
}
}