| /* |
| * 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.samza.test.operator; |
| |
| import java.time.Duration; |
| import org.apache.samza.application.descriptors.StreamApplicationDescriptor; |
| 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.windows.Windows; |
| import org.apache.samza.runtime.ApplicationRunner; |
| import org.apache.samza.runtime.ApplicationRunners; |
| import org.apache.samza.serializers.IntegerSerde; |
| import org.apache.samza.serializers.JsonSerdeV2; |
| import org.apache.samza.serializers.KVSerde; |
| import org.apache.samza.serializers.StringSerde; |
| import org.apache.samza.system.kafka.descriptors.KafkaInputDescriptor; |
| import org.apache.samza.system.kafka.descriptors.KafkaOutputDescriptor; |
| import org.apache.samza.system.kafka.descriptors.KafkaSystemDescriptor; |
| import org.apache.samza.test.operator.data.PageView; |
| import org.apache.samza.util.CommandLine; |
| |
| |
| /** |
| * A {@link StreamApplication} that demonstrates a filter followed by a tumbling window. |
| */ |
| public class TumblingWindowApp implements StreamApplication { |
| private static final String SYSTEM = "kafka"; |
| private static final String INPUT_TOPIC = "page-views"; |
| private static final String OUTPUT_TOPIC = "page-view-counts"; |
| private static final String FILTER_KEY = "badKey"; |
| |
| public static void main(String[] args) { |
| CommandLine cmdLine = new CommandLine(); |
| Config config = cmdLine.loadConfig(cmdLine.parser().parse(args)); |
| ApplicationRunner runner = ApplicationRunners.getApplicationRunner(new TumblingWindowApp(), config); |
| |
| runner.run(); |
| runner.waitForFinish(); |
| } |
| |
| @Override |
| public void describe(StreamApplicationDescriptor appDescriptor) { |
| JsonSerdeV2<PageView> inputSerde = new JsonSerdeV2<>(PageView.class); |
| KVSerde<String, Integer> outputSerde = KVSerde.of(new StringSerde(), new IntegerSerde()); |
| KafkaSystemDescriptor ksd = new KafkaSystemDescriptor(SYSTEM); |
| KafkaInputDescriptor<PageView> id = ksd.getInputDescriptor(INPUT_TOPIC, inputSerde); |
| KafkaOutputDescriptor<KV<String, Integer>> od = ksd.getOutputDescriptor(OUTPUT_TOPIC, outputSerde); |
| |
| MessageStream<PageView> pageViews = appDescriptor.getInputStream(id); |
| OutputStream<KV<String, Integer>> outputStream = appDescriptor.getOutputStream(od); |
| |
| pageViews |
| .filter(m -> !FILTER_KEY.equals(m.getUserId())) |
| .window(Windows.keyedTumblingWindow(PageView::getUserId, Duration.ofSeconds(3), |
| new StringSerde(), new JsonSerdeV2<>(PageView.class)), "tumblingWindow") |
| .map(m -> KV.of(m.getKey().getKey(), m.getMessage().size())) |
| .sendTo(outputStream); |
| |
| } |
| } |