knaufk commented on a change in pull request #9192: [FLINK-12749] [docs] [examples] Initial Version of Flink Cluster Playground URL: https://github.com/apache/flink/pull/9192#discussion_r308528408
########## File path: flink-examples/flink-examples-streaming/src/main/java/org/apache/flink/streaming/examples/windowing/clickeventcount/ClickEventGenerator.java ########## @@ -0,0 +1,111 @@ +/* + * 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 org.apache.flink.streaming.examples.windowing.clickeventcount; + +import org.apache.flink.api.java.utils.ParameterTool; +import org.apache.flink.streaming.examples.windowing.clickeventcount.records.ClickEvent; +import org.apache.flink.streaming.examples.windowing.clickeventcount.records.ClickEventSerializationSchema; + +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.ByteArraySerializer; + +import java.util.Arrays; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.Properties; +import java.util.concurrent.TimeUnit; + +import static org.apache.flink.streaming.examples.windowing.clickeventcount.ClickEventCount.WINDOW_SIZE; + +/** + * A generator which pushes {@link ClickEvent}s into a Kafka Topic configured via `--topic` and + * `--bootstrap.servers`. + * + * <p> The generator creates the same number of {@link ClickEvent}s for all pages. The delay between + * events is chosen such that processing time and event time roughly align. The generator always + * creates the same sequence of events. </p> + * + */ +public class ClickEventGenerator { + + public static final int EVENTS_PER_WINDOW = 1000; + + private static final List<String> pages = Arrays.asList("/help", "/index", "/shop", "/jobs", "/about", "/news"); + + private static KafkaProducer<byte[], byte[]> producer; + + private static Map<String, Long> nextTimestampPerKey = new HashMap<>(); + private static int nextPageIndex = 0; + + //this calculation is only accurate as long as pages.size() * EVENTS_PER_WINDOW divides the + //window size + public static final long DELAY = WINDOW_SIZE.toMilliseconds() / pages.size() / EVENTS_PER_WINDOW; + + public static void main(String[] args) throws Exception { + + final ParameterTool params = ParameterTool.fromArgs(args); + + String topic = params.get("topic", "input"); + + Properties kafkaProps = createKafkaProperties(params); + producer = new KafkaProducer<>(kafkaProps); + + while (true) { + + String page = nextPage(); + ClickEvent event = new ClickEvent(nextTimestamp(page), page); + + ProducerRecord<byte[], byte[]> record = new ClickEventSerializationSchema(topic).serialize( + event, + null); + + producer.send(record); + + Thread.sleep(DELAY); + } + } + + private static Properties createKafkaProperties(final ParameterTool params) { + String brokers = params.get("bootstrap.servers", "localhost:9092"); + Properties kafkaProps = new Properties(); + kafkaProps.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, brokers); + kafkaProps.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, ByteArraySerializer.class.getCanonicalName()); + kafkaProps.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, ByteArraySerializer.class.getCanonicalName()); + return kafkaProps; + } + + public static long nextTimestamp(String page) { Review comment: Arguably a better design, yes :) Done. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services
