| /* |
| * 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.training.exercises.longrides; |
| |
| import org.apache.flink.annotation.VisibleForTesting; |
| import org.apache.flink.api.common.JobExecutionResult; |
| import org.apache.flink.api.common.eventtime.WatermarkStrategy; |
| import org.apache.flink.configuration.Configuration; |
| import org.apache.flink.streaming.api.datastream.DataStream; |
| import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; |
| import org.apache.flink.streaming.api.functions.KeyedProcessFunction; |
| import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction; |
| import org.apache.flink.streaming.api.functions.sink.SinkFunction; |
| import org.apache.flink.streaming.api.functions.source.SourceFunction; |
| import org.apache.flink.training.exercises.common.datatypes.TaxiRide; |
| import org.apache.flink.training.exercises.common.sources.TaxiRideGenerator; |
| import org.apache.flink.training.exercises.common.utils.MissingSolutionException; |
| import org.apache.flink.util.Collector; |
| |
| import java.time.Duration; |
| |
| /** |
| * The "Long Ride Alerts" exercise. |
| * |
| * <p>The goal for this exercise is to emit the rideIds for taxi rides with a duration of more than |
| * two hours. You should assume that TaxiRide events can be lost, but there are no duplicates. |
| * |
| * <p>You should eventually clear any state you create. |
| */ |
| public class LongRidesExercise { |
| private final SourceFunction<TaxiRide> source; |
| private final SinkFunction<Long> sink; |
| |
| /** Creates a job using the source and sink provided. */ |
| public LongRidesExercise(SourceFunction<TaxiRide> source, SinkFunction<Long> sink) { |
| this.source = source; |
| this.sink = sink; |
| } |
| |
| /** |
| * Creates and executes the long rides pipeline. |
| * |
| * @return {JobExecutionResult} |
| * @throws Exception which occurs during job execution. |
| */ |
| public JobExecutionResult execute() throws Exception { |
| |
| // set up streaming execution environment |
| StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment(); |
| |
| // start the data generator |
| DataStream<TaxiRide> rides = env.addSource(source); |
| |
| // the WatermarkStrategy specifies how to extract timestamps and generate watermarks |
| WatermarkStrategy<TaxiRide> watermarkStrategy = |
| WatermarkStrategy.<TaxiRide>forBoundedOutOfOrderness(Duration.ofSeconds(60)) |
| .withTimestampAssigner( |
| (ride, streamRecordTimestamp) -> ride.getEventTimeMillis()); |
| |
| // create the pipeline |
| rides.assignTimestampsAndWatermarks(watermarkStrategy) |
| .keyBy(ride -> ride.rideId) |
| .process(new AlertFunction()) |
| .addSink(sink); |
| |
| // execute the pipeline and return the result |
| return env.execute("Long Taxi Rides"); |
| } |
| |
| /** |
| * Main method. |
| * |
| * @throws Exception which occurs during job execution. |
| */ |
| public static void main(String[] args) throws Exception { |
| LongRidesExercise job = |
| new LongRidesExercise(new TaxiRideGenerator(), new PrintSinkFunction<>()); |
| |
| job.execute(); |
| } |
| |
| @VisibleForTesting |
| public static class AlertFunction extends KeyedProcessFunction<Long, TaxiRide, Long> { |
| |
| @Override |
| public void open(Configuration config) throws Exception { |
| throw new MissingSolutionException(); |
| } |
| |
| @Override |
| public void processElement(TaxiRide ride, Context context, Collector<Long> out) |
| throws Exception {} |
| |
| @Override |
| public void onTimer(long timestamp, OnTimerContext context, Collector<Long> out) |
| throws Exception {} |
| } |
| } |