/**
* 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;
import backtype.storm.Config;
import backtype.storm.LocalCluster;
import backtype.storm.generated.StormTopology;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Values;
import storm.kafka.trident.TridentKafkaState;
import storm.kafka.trident.TridentKafkaStateFactory;
import storm.kafka.trident.TridentKafkaUpdater;
import storm.kafka.trident.mapper.FieldNameBasedTupleToKafkaMapper;
import storm.kafka.trident.selector.DefaultTopicSelector;
import storm.trident.Stream;
import storm.trident.TridentTopology;
import storm.trident.testing.FixedBatchSpout;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
public class TridentKafkaTopology {
private static StormTopology buildTopology() {
Fields fields = new Fields("word", "count");
FixedBatchSpout spout = new FixedBatchSpout(fields, 4,
new Values("storm", "1"),
new Values("trident", "1"),
new Values("needs", "1"),
new Values("javadoc", "1")
);
spout.setCycle(true);
TridentTopology topology = new TridentTopology();
Stream stream = topology.newStream("spout1", spout);
TridentKafkaStateFactory stateFactory = new TridentKafkaStateFactory()
.withKafkaTopicSelector(new DefaultTopicSelector("test"))
.withTridentTupleToKafkaMapper(new FieldNameBasedTupleToKafkaMapper("word", "count"));
stream.partitionPersist(stateFactory, fields, new TridentKafkaUpdater(), new Fields());
return topology.build();
}
/**
* To run this topology ensure you have a kafka broker running and provide connection string to broker as argument.
* Create a topic test with command line,
* kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partition 1 --topic test
*
* run this program and run the kafka consumer:
* kafka-console-consumer.sh --zookeeper localhost:2181 --topic test --from-beginning
*
* you should see the messages flowing through.
*
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
if(args.length < 1) {
System.out.println("Please provide kafka broker url ,e.g. localhost:9092");
}
Config conf = getConfig(args[0]);
LocalCluster cluster = new LocalCluster();
cluster.submitTopology("wordCounter", conf, buildTopology());
Thread.sleep(60 * 1000);
cluster.killTopology("wordCounter");
cluster.shutdown();
}
private static Config getConfig(String brokerConnectionString) {
Config conf = new Config();
Map config = new HashMap();
Properties props = new Properties();
props.put("metadata.broker.list", brokerConnectionString);
props.put("request.required.acks", "1");
props.put("serializer.class", "kafka.serializer.StringEncoder");
conf.put(TridentKafkaState.KAFKA_BROKER_PROPERTIES, props);
return conf;
}
}