| /* |
| * 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.test.windowing.sessionwindows; |
| |
| import org.apache.flink.util.Preconditions; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /** |
| * Produces the session event generators. |
| * |
| * @param <K> type of session keys |
| */ |
| public class EventGeneratorFactory<K, E> { |
| |
| // map key -> latest generator for this key |
| private final Map<K, EventGenerator<K, E>> latestGeneratorsByKey; |
| |
| // pseudo random engine |
| private final LongRandomGenerator randomGenerator; |
| |
| // configuration for the streams that are simulated by the generators this factory creates |
| private final GeneratorConfiguration generatorConfiguration; |
| |
| // factory for the events that is employed be the event generators this factory creates |
| private final GeneratorEventFactory<K, E> eventFactory; |
| |
| // number of timely events generators produce per session |
| private final int timelyEventsPerSession; |
| |
| // the max. gap between events that belong to one session |
| private final long maxSessionEventGap; |
| |
| // counter that tracks how many generators this has produced |
| private int producedGeneratorsCount; |
| |
| public EventGeneratorFactory( |
| GeneratorConfiguration generatorConfiguration, |
| GeneratorEventFactory<K, E> eventFactory, |
| long sessionTimeout, |
| int timelyEventsPerSession, |
| LongRandomGenerator randomGenerator) { |
| |
| Preconditions.checkNotNull(generatorConfiguration); |
| Preconditions.checkNotNull(randomGenerator); |
| Preconditions.checkArgument(sessionTimeout >= 0); |
| Preconditions.checkArgument(timelyEventsPerSession >= 0); |
| |
| this.latestGeneratorsByKey = new HashMap<>(); |
| this.generatorConfiguration = generatorConfiguration; |
| this.eventFactory = eventFactory; |
| this.randomGenerator = randomGenerator; |
| this.maxSessionEventGap = sessionTimeout; |
| this.timelyEventsPerSession = timelyEventsPerSession; |
| this.producedGeneratorsCount = 0; |
| } |
| |
| /** |
| * @param key the key for the new session generator to instantiate |
| * @param globalWatermark the current global watermark |
| * @return a new event generator instance that generates events for the provided session key |
| */ |
| public EventGenerator<K, E> newSessionGeneratorForKey(K key, long globalWatermark) { |
| EventGenerator<K, E> eventGenerator = latestGeneratorsByKey.get(key); |
| |
| if (eventGenerator == null) { |
| SessionConfiguration<K, E> sessionConfiguration = |
| SessionConfiguration.of( |
| key, |
| 0, |
| maxSessionEventGap, |
| globalWatermark, |
| timelyEventsPerSession, |
| eventFactory); |
| SessionGeneratorConfiguration<K, E> sessionGeneratorConfiguration = |
| new SessionGeneratorConfiguration<>( |
| sessionConfiguration, generatorConfiguration); |
| eventGenerator = |
| new SessionEventGeneratorImpl<>(sessionGeneratorConfiguration, randomGenerator); |
| } else { |
| eventGenerator = eventGenerator.getNextGenerator(globalWatermark); |
| } |
| latestGeneratorsByKey.put(key, eventGenerator); |
| ++producedGeneratorsCount; |
| return eventGenerator; |
| } |
| |
| public int getProducedGeneratorsCount() { |
| return producedGeneratorsCount; |
| } |
| } |