| /* |
| * 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.api.java.utils.ParameterTool; |
| import org.apache.flink.configuration.Configuration; |
| import org.apache.flink.streaming.api.TimeCharacteristic; |
| import org.apache.flink.streaming.api.TimerService; |
| 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.training.exercises.common.datatypes.TaxiRide; |
| import org.apache.flink.training.exercises.common.sources.TaxiRideSource; |
| import org.apache.flink.training.exercises.common.utils.ExerciseBase; |
| import org.apache.flink.training.exercises.common.utils.MissingSolutionException; |
| import org.apache.flink.util.Collector; |
| |
| /** |
| * The "Long Ride Alerts" exercise of the Flink training in the docs. |
| * |
| * <p>The goal for this exercise is to emit START events for taxi rides that have not been matched |
| * by an END event during the first 2 hours of the ride. |
| * |
| * <p>Parameters: |
| * -input path-to-input-file |
| */ |
| public class LongRidesExercise extends ExerciseBase { |
| |
| /** |
| * Main method. |
| * |
| * <p>Parameters: |
| * -input path-to-input-file |
| * |
| * @throws Exception which occurs during job execution. |
| */ |
| public static void main(String[] args) throws Exception { |
| |
| ParameterTool params = ParameterTool.fromArgs(args); |
| final String input = params.get("input", ExerciseBase.PATH_TO_RIDE_DATA); |
| |
| final int maxEventDelay = 60; // events are out of order by max 60 seconds |
| final int servingSpeedFactor = 600; // events of 10 minutes are served in 1 second |
| |
| // set up streaming execution environment |
| StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment(); |
| env.setStreamTimeCharacteristic(TimeCharacteristic.EventTime); |
| env.setParallelism(ExerciseBase.parallelism); |
| |
| // start the data generator |
| DataStream<TaxiRide> rides = env.addSource(rideSourceOrTest(new TaxiRideSource(input, maxEventDelay, servingSpeedFactor))); |
| |
| DataStream<TaxiRide> longRides = rides |
| .keyBy((TaxiRide ride) -> ride.rideId) |
| .process(new MatchFunction()); |
| |
| printOrTest(longRides); |
| |
| env.execute("Long Taxi Rides"); |
| } |
| |
| public static class MatchFunction extends KeyedProcessFunction<Long, TaxiRide, TaxiRide> { |
| |
| @Override |
| public void open(Configuration config) throws Exception { |
| throw new MissingSolutionException(); |
| } |
| |
| @Override |
| public void processElement(TaxiRide ride, Context context, Collector<TaxiRide> out) throws Exception { |
| TimerService timerService = context.timerService(); |
| } |
| |
| @Override |
| public void onTimer(long timestamp, OnTimerContext context, Collector<TaxiRide> out) throws Exception { |
| } |
| } |
| } |