| /* |
| * 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 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.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 implementation of a task that splits its input into multiple output streams. |
| */ |
| public class BroadcastExample 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 BroadcastExample(), config); |
| runner.run(); |
| runner.waitForFinish(); |
| } |
| |
| @Override |
| public void describe(StreamApplicationDescriptor appDescriptor) { |
| KVSerde<String, PageViewEvent> serde = KVSerde.of(new StringSerde("UTF-8"), new JsonSerdeV2<>(PageViewEvent.class)); |
| KafkaSystemDescriptor trackingSystem = new KafkaSystemDescriptor("tracking"); |
| KafkaInputDescriptor<KV<String, PageViewEvent>> pageViewEvent = |
| trackingSystem.getInputDescriptor("pageViewEvent", serde); |
| KafkaOutputDescriptor<KV<String, PageViewEvent>> outStream1 = |
| trackingSystem.getOutputDescriptor("outStream1", serde); |
| KafkaOutputDescriptor<KV<String, PageViewEvent>> outStream2 = |
| trackingSystem.getOutputDescriptor("outStream2", serde); |
| KafkaOutputDescriptor<KV<String, PageViewEvent>> outStream3 = |
| trackingSystem.getOutputDescriptor("outStream3", serde); |
| |
| MessageStream<KV<String, PageViewEvent>> inputStream = appDescriptor.getInputStream(pageViewEvent); |
| inputStream.filter(m -> m.key.equals("key1")).sendTo(appDescriptor.getOutputStream(outStream1)); |
| inputStream.filter(m -> m.key.equals("key2")).sendTo(appDescriptor.getOutputStream(outStream2)); |
| inputStream.filter(m -> m.key.equals("key3")).sendTo(appDescriptor.getOutputStream(outStream3)); |
| } |
| } |