/**
 * 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 under the License.
 */
package storm.kafka.trident;

import backtype.storm.task.OutputCollector;
import backtype.storm.topology.FailedException;
import org.apache.commons.lang.Validate;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import storm.kafka.trident.mapper.TridentTupleToKafkaMapper;
import storm.kafka.trident.selector.KafkaTopicSelector;
import storm.trident.operation.TridentCollector;
import storm.trident.state.State;
import storm.trident.tuple.TridentTuple;

import java.util.List;
import java.util.Map;
import java.util.Properties;

public class TridentKafkaState implements State {
    private static final Logger LOG = LoggerFactory.getLogger(TridentKafkaState.class);

    public static final String KAFKA_BROKER_PROPERTIES = "kafka.broker.properties";

    private KafkaProducer producer;
    private OutputCollector collector;

    private TridentTupleToKafkaMapper mapper;
    private KafkaTopicSelector topicSelector;

    public TridentKafkaState withTridentTupleToKafkaMapper(TridentTupleToKafkaMapper mapper) {
        this.mapper = mapper;
        return this;
    }

    public TridentKafkaState withKafkaTopicSelector(KafkaTopicSelector selector) {
        this.topicSelector = selector;
        return this;
    }

    @Override
    public void beginCommit(Long txid) {
        LOG.debug("beginCommit is Noop.");
    }

    @Override
    public void commit(Long txid) {
        LOG.debug("commit is Noop.");
    }

    public void prepare(Map stormConf) {
        Validate.notNull(mapper, "mapper can not be null");
        Validate.notNull(topicSelector, "topicSelector can not be null");
        Map configMap = (Map) stormConf.get(KAFKA_BROKER_PROPERTIES);
        Properties properties = new Properties();
        properties.putAll(configMap);
        producer = new KafkaProducer(properties);
    }

    public void updateState(List<TridentTuple> tuples, TridentCollector collector) {
        String topic = null;
        for (TridentTuple tuple : tuples) {
            try {
                topic = topicSelector.getTopic(tuple);

                if(topic != null) {
                    producer.send(new ProducerRecord(topic, mapper.getKeyFromTuple(tuple),
                            mapper.getMessageFromTuple(tuple))).get();
                } else {
                    LOG.warn("skipping key = " + mapper.getKeyFromTuple(tuple) + ", topic selector returned null.");
                }
            } catch (Exception ex) {
                String errorMsg = "Could not send message with key = " + mapper.getKeyFromTuple(tuple)
                        + " to topic = " + topic;
                LOG.warn(errorMsg, ex);
                throw new FailedException(errorMsg, ex);
            }
        }
    }
}

@@ -1072,16 +1072,73 @@
 Record;%0A
+import org.apache.kafka.clients.producer.RecordMetadata;%0A
 import o
@@ -1501,16 +1501,100 @@
 perties;
+%0Aimport java.util.concurrent.ExecutionException;%0Aimport java.util.concurrent.Future;
 %0A%0Apublic
@@ -3156,24 +3156,56 @@
             
+ Future%3CRecordMetadata%3E result =
  producer.se
@@ -3232,16 +3232,44 @@
 d(topic,
+%0A                           
  mapper.
@@ -3291,16 +3291,53 @@
 (tuple),
+ mapper.getMessageFromTuple(tuple)));
 %0A       
@@ -3339,32 +3339,40 @@
                 
+  try %7B%0A
           mapper
@@ -3369,50 +3369,408 @@
     
-mapper.getMessageFromTuple(tuple))).get();
+              result.get();%0A                    %7D catch (ExecutionException e) %7B%0A                        String errorMsg = %22Could not retrieve result for message with key = %22%0A                                + mapper.getKeyFromTuple(tuple) + %22 from topic = %22 + topic;%0A                        LOG.error(errorMsg, e);%0A                        throw new FailedException(errorMsg, e);%0A                    %7D
 %0A   

Check exceptions for response