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PageViewRegionExampleDriver.java
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PageViewRegionExampleDriver.java
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/**
* Copyright 2016 Confluent Inc.
*
* Licensed 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 io.confluent.examples.streams;
import org.apache.avro.Schema;
import org.apache.avro.generic.GenericRecord;
import org.apache.avro.generic.GenericRecordBuilder;
import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerConfig;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.apache.kafka.common.serialization.LongDeserializer;
import org.apache.kafka.common.serialization.StringDeserializer;
import org.apache.kafka.common.serialization.StringSerializer;
import java.io.IOException;
import java.io.InputStream;
import java.util.Collections;
import java.util.Properties;
import java.util.Random;
import java.util.stream.IntStream;
/**
* This is a sample driver for the {@link PageViewRegionExample} and
* {@link PageViewRegionLambdaExample}
* To run this driver please first refer to the instructions in {@link PageViewRegionExample} or
* {@link PageViewRegionLambdaExample}.
* You can then run this class directly in your IDE or via the command line.
*
* To run via the command line you might want to package as a fatjar first. Please refer to:
* <a href='https://github.com/confluentinc/examples/tree/master/kafka-streams#packaging-and-running'>Packaging</a>
*
* Once packaged you can then run:
* java -cp target/streams-examples-3.0.0-standalone.jar io.confluent.examples.streams.PageViewRegionExampleDriver
*
* You should terminate with Ctrl-C
*/
public class PageViewRegionExampleDriver {
public static void main(String[] args) throws IOException {
produceInputs();
consumeOutput();
}
private static void produceInputs() throws IOException {
final String[] users = {"erica", "bob", "joe", "damian", "tania", "phil", "sam",
"lauren", "joseph"};
final String[] regions = {"europe", "usa", "asia", "africa"};
final Properties props = new Properties();
props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG,
StringSerializer.class);
props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG,
io.confluent.kafka.serializers.KafkaAvroSerializer.class);
props.put("schema.registry.url", "http://localhost:8081");
final KafkaProducer<String, GenericRecord> producer = new KafkaProducer<>(props);
final GenericRecordBuilder pageViewBuilder =
new GenericRecordBuilder(loadSchema("pageview.avsc"));
final GenericRecordBuilder userProfileBuilder =
new GenericRecordBuilder(loadSchema("userprofile.avsc"));
final String pageViewsTopic = "PageViews";
final String userProfilesTopic = "UserProfiles";
final Random random = new Random();
for (String user : users) {
userProfileBuilder.set("experience", "some");
userProfileBuilder.set("region", regions[random.nextInt(regions.length)]);
producer.send(new ProducerRecord<>(userProfilesTopic, user, userProfileBuilder.build()));
// For each user generate some page views
IntStream.range(0, random.nextInt(10))
.mapToObj(value -> {
pageViewBuilder.set("user", user);
pageViewBuilder.set("page", "index.html");
pageViewBuilder.set("industry", "engineering");
return pageViewBuilder.build();
}).forEach(
record -> producer.send(new ProducerRecord<>(pageViewsTopic, null, record))
);
}
producer.flush();
}
private static void consumeOutput() {
final String resultTopic = "PageViewsByRegion";
final Properties consumerProperties = new Properties();
consumerProperties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
consumerProperties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
consumerProperties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, LongDeserializer.class);
consumerProperties.put(ConsumerConfig.GROUP_ID_CONFIG,
"pageview-region-lambda-example-consumer");
consumerProperties.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
final KafkaConsumer<String, Long> consumer = new KafkaConsumer<>(consumerProperties);
consumer.subscribe(Collections.singleton(resultTopic));
while (true) {
ConsumerRecords<String, Long> consumerRecords = consumer.poll(Long.MAX_VALUE);
for (ConsumerRecord<String, Long> consumerRecord : consumerRecords) {
System.out.println(consumerRecord.key() + ":" + consumerRecord.value());
}
}
}
private static Schema loadSchema(String name) throws IOException {
try (InputStream input = PageViewRegionLambdaExample.class.getClassLoader()
.getResourceAsStream("avro/io/confluent/examples/streams/" + name)) {
return new Schema.Parser().parse(input);
}
}
}