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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 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();
}
}
}