| /* |
| * 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.example; |
| |
| import java.time.Duration; |
| import org.apache.samza.application.StreamApplication; |
| import org.apache.samza.application.descriptors.StreamApplicationDescriptor; |
| import org.apache.samza.config.Config; |
| import org.apache.samza.example.models.PageViewEvent; |
| import org.apache.samza.operators.KV; |
| import org.apache.samza.operators.MessageStream; |
| import org.apache.samza.operators.OutputStream; |
| import org.apache.samza.operators.windows.WindowPane; |
| import org.apache.samza.operators.windows.Windows; |
| import org.apache.samza.runtime.ApplicationRunner; |
| import org.apache.samza.runtime.ApplicationRunners; |
| 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.util.CommandLine; |
| |
| |
| /** |
| * Example {@link StreamApplication} code to test the API methods with re-partition operator |
| */ |
| public class RepartitionExample implements StreamApplication { |
| |
| // local execution mode |
| public static void main(String[] args) { |
| CommandLine cmdLine = new CommandLine(); |
| Config config = cmdLine.loadConfig(cmdLine.parser().parse(args)); |
| ApplicationRunner runner = ApplicationRunners.getApplicationRunner(new RepartitionExample(), config); |
| |
| runner.run(); |
| runner.waitForFinish(); |
| } |
| |
| @Override |
| public void describe(StreamApplicationDescriptor appDescriptor) { |
| KafkaSystemDescriptor trackingSystem = new KafkaSystemDescriptor("tracking"); |
| |
| KafkaInputDescriptor<PageViewEvent> inputStreamDescriptor = |
| trackingSystem.getInputDescriptor("pageViewEvent", new JsonSerdeV2<>(PageViewEvent.class)); |
| |
| KafkaOutputDescriptor<KV<String, MyStreamOutput>> outputStreamDescriptor = |
| trackingSystem.getOutputDescriptor("pageViewEventPerMember", |
| KVSerde.of(new StringSerde(), new JsonSerdeV2<>(MyStreamOutput.class))); |
| |
| appDescriptor.withDefaultSystem(trackingSystem); |
| MessageStream<PageViewEvent> pageViewEvents = appDescriptor.getInputStream(inputStreamDescriptor); |
| OutputStream<KV<String, MyStreamOutput>> pageViewEventPerMember = appDescriptor.getOutputStream(outputStreamDescriptor); |
| |
| pageViewEvents |
| .partitionBy(pve -> pve.getMemberId(), pve -> pve, |
| KVSerde.of(new StringSerde(), new JsonSerdeV2<>(PageViewEvent.class)), "partitionBy") |
| .window(Windows.keyedTumblingWindow( |
| KV::getKey, Duration.ofMinutes(5), () -> 0, (m, c) -> c + 1, null, null), "window") |
| .map(windowPane -> KV.of(windowPane.getKey().getKey(), new MyStreamOutput(windowPane))) |
| .sendTo(pageViewEventPerMember); |
| } |
| |
| static class MyStreamOutput { |
| String memberId; |
| long timestamp; |
| int count; |
| |
| MyStreamOutput(WindowPane<String, Integer> m) { |
| this.memberId = m.getKey().getKey(); |
| this.timestamp = Long.valueOf(m.getKey().getPaneId()); |
| this.count = m.getMessage(); |
| } |
| } |
| } |