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PageViewAdClickJoiner.java
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PageViewAdClickJoiner.java
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/*
* 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 samza.examples.cookbook;
import org.apache.samza.application.StreamApplication;
import org.apache.samza.config.Config;
import org.apache.samza.operators.KV;
import org.apache.samza.operators.MessageStream;
import org.apache.samza.operators.OutputStream;
import org.apache.samza.operators.StreamGraph;
import org.apache.samza.operators.functions.JoinFunction;
import org.apache.samza.serializers.JsonSerdeV2;
import org.apache.samza.serializers.KVSerde;
import org.apache.samza.serializers.StringSerde;
import samza.examples.cookbook.data.AdClick;
import samza.examples.cookbook.data.PageView;
import java.time.Duration;
/**
* In this example, we join a stream of Page views with a stream of Ad clicks. For instance, this is helpful for
* analysis on what pages served an Ad that was clicked.
*
* <p> Concepts covered: Performing stream to stream Joins.
*
* To run the below example:
*
* <ol>
* <li>
* Ensure that the topics "pageview-join-input", "adclick-join-input" are created <br/>
* ./deploy/kafka/bin/kafka-topics.sh --zookeeper localhost:2181 --create --topic pageview-join-input --partitions 2 --replication-factor 1
* ./deploy/kafka/bin/kafka-topics.sh --zookeeper localhost:2181 --create --topic adclick-join-input --partitions 2 --replication-factor 1
* </li>
* <li>
* Run the application using the run-app.sh script <br/>
* ./deploy/samza/bin/run-app.sh --config-factory=org.apache.samza.config.factories.PropertiesConfigFactory --config-path=file://$PWD/deploy/samza/config/pageview-adclick-joiner.properties
* </li>
* <li>
* Produce some messages to the "pageview-join-input" topic <br/>
* ./deploy/kafka/bin/kafka-console-producer.sh --topic pageview-join-input --broker-list localhost:9092 <br/>
* {"userId": "user1", "country": "india", "pageId":"google.com"} <br/>
* {"userId": "user2", "country": "china", "pageId":"yahoo.com"}
* </li>
* <li>
* Produce some messages to the "adclick-join-input" topic with the same pageKey <br/>
* ./deploy/kafka/bin/kafka-console-producer.sh --topic adclick-join-input --broker-list localhost:9092 <br/>
* {"userId": "user1", "adId": "adClickId1", "pageId":"google.com"} <br/>
* {"userId": "user1", "adId": "adClickId2", "pageId":"yahoo.com"}
* </li>
* <li>
* Consume messages from the "pageview-adclick-join-output" topic <br/>
* ./deploy/kafka/bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic pageview-adclick-join-output --property print.key=true
* </li>
* </ol>
*
*/
public class PageViewAdClickJoiner implements StreamApplication {
private static final String PAGEVIEW_TOPIC = "pageview-join-input";
private static final String AD_CLICK_TOPIC = "adclick-join-input";
private static final String OUTPUT_TOPIC = "pageview-adclick-join-output";
@Override
public void init(StreamGraph graph, Config config) {
StringSerde stringSerde = new StringSerde();
JsonSerdeV2<PageView> pageViewSerde = new JsonSerdeV2<>(PageView.class);
JsonSerdeV2<AdClick> adClickSerde = new JsonSerdeV2<>(AdClick.class);
JsonSerdeV2<JoinResult> joinResultSerde = new JsonSerdeV2<>(JoinResult.class);
MessageStream<PageView> pageViews = graph.getInputStream(PAGEVIEW_TOPIC, pageViewSerde);
MessageStream<AdClick> adClicks = graph.getInputStream(AD_CLICK_TOPIC, adClickSerde);
OutputStream<JoinResult> joinResults = graph.getOutputStream(OUTPUT_TOPIC, joinResultSerde);
JoinFunction<String, PageView, AdClick, JoinResult> pageViewAdClickJoinFunction =
new JoinFunction<String, PageView, AdClick, JoinResult>() {
@Override
public JoinResult apply(PageView pageView, AdClick adClick) {
return new JoinResult(pageView.pageId, pageView.userId, pageView.country, adClick.getAdId());
}
@Override
public String getFirstKey(PageView pageView) {
return pageView.pageId;
}
@Override
public String getSecondKey(AdClick adClick) {
return adClick.getPageId();
}
};
MessageStream<PageView> repartitionedPageViews =
pageViews
.partitionBy(pv -> pv.pageId, pv -> pv, KVSerde.of(stringSerde, pageViewSerde))
.map(KV::getValue);
MessageStream<AdClick> repartitionedAdClicks =
adClicks
.partitionBy(AdClick::getPageId, ac -> ac, KVSerde.of(stringSerde, adClickSerde))
.map(KV::getValue);
repartitionedPageViews
.join(repartitionedAdClicks, pageViewAdClickJoinFunction,
stringSerde, pageViewSerde, adClickSerde, Duration.ofMinutes(3))
.sendTo(joinResults);
}
static class JoinResult {
public String pageId;
public String userId;
public String country;
public String adId;
public JoinResult(String pageId, String userId, String country, String adId) {
this.pageId = pageId;
this.userId = userId;
this.country = country;
this.adId = adId;
}
}
}