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[FLINK-4660] Allow ProcessFunction on DataStream
Introduce new ProcessOperator for this. Rename the pre-existing ProcessOperator to KeyedProcessOperator.
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151 changes: 151 additions & 0 deletions
151
...ing-java/src/main/java/org/apache/flink/streaming/api/operators/KeyedProcessOperator.java
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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. | ||
| */ | ||
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| package org.apache.flink.streaming.api.operators; | ||
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| import org.apache.flink.annotation.Internal; | ||
| import org.apache.flink.runtime.state.VoidNamespace; | ||
| import org.apache.flink.runtime.state.VoidNamespaceSerializer; | ||
| import org.apache.flink.streaming.api.SimpleTimerService; | ||
| import org.apache.flink.streaming.api.TimeDomain; | ||
| import org.apache.flink.streaming.api.TimerService; | ||
| import org.apache.flink.streaming.api.functions.ProcessFunction; | ||
| import org.apache.flink.streaming.runtime.streamrecord.StreamRecord; | ||
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| import static org.apache.flink.util.Preconditions.checkNotNull; | ||
| import static org.apache.flink.util.Preconditions.checkState; | ||
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| @Internal | ||
| public class KeyedProcessOperator<K, IN, OUT> | ||
| extends AbstractUdfStreamOperator<OUT, ProcessFunction<IN, OUT>> | ||
| implements OneInputStreamOperator<IN, OUT>, Triggerable<K, VoidNamespace> { | ||
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| private static final long serialVersionUID = 1L; | ||
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| private transient TimestampedCollector<OUT> collector; | ||
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| private transient ContextImpl<IN, OUT> context; | ||
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| private transient OnTimerContextImpl<IN, OUT> onTimerContext; | ||
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| public KeyedProcessOperator(ProcessFunction<IN, OUT> function) { | ||
| super(function); | ||
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| chainingStrategy = ChainingStrategy.ALWAYS; | ||
| } | ||
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| @Override | ||
| public void open() throws Exception { | ||
| super.open(); | ||
| collector = new TimestampedCollector<>(output); | ||
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| InternalTimerService<VoidNamespace> internalTimerService = | ||
| getInternalTimerService("user-timers", VoidNamespaceSerializer.INSTANCE, this); | ||
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| TimerService timerService = new SimpleTimerService(internalTimerService); | ||
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| context = new ContextImpl<>(userFunction, timerService); | ||
| onTimerContext = new OnTimerContextImpl<>(userFunction, timerService); | ||
| } | ||
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| @Override | ||
| public void onEventTime(InternalTimer<K, VoidNamespace> timer) throws Exception { | ||
| collector.setAbsoluteTimestamp(timer.getTimestamp()); | ||
| onTimerContext.timeDomain = TimeDomain.EVENT_TIME; | ||
| onTimerContext.timer = timer; | ||
| userFunction.onTimer(timer.getTimestamp(), onTimerContext, collector); | ||
| onTimerContext.timeDomain = null; | ||
| onTimerContext.timer = null; | ||
| } | ||
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| @Override | ||
| public void onProcessingTime(InternalTimer<K, VoidNamespace> timer) throws Exception { | ||
| collector.setAbsoluteTimestamp(timer.getTimestamp()); | ||
| onTimerContext.timeDomain = TimeDomain.PROCESSING_TIME; | ||
| onTimerContext.timer = timer; | ||
| userFunction.onTimer(timer.getTimestamp(), onTimerContext, collector); | ||
| onTimerContext.timeDomain = null; | ||
| onTimerContext.timer = null; | ||
| } | ||
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| @Override | ||
| public void processElement(StreamRecord<IN> element) throws Exception { | ||
| collector.setTimestamp(element); | ||
| context.element = element; | ||
| userFunction.processElement(element.getValue(), context, collector); | ||
| context.element = null; | ||
| } | ||
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| private static class ContextImpl<IN, OUT> extends ProcessFunction<IN, OUT>.Context { | ||
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| private final TimerService timerService; | ||
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| private StreamRecord<IN> element; | ||
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| ContextImpl(ProcessFunction<IN, OUT> function, TimerService timerService) { | ||
| function.super(); | ||
| this.timerService = checkNotNull(timerService); | ||
| } | ||
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| @Override | ||
| public Long timestamp() { | ||
| checkState(element != null); | ||
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| if (element.hasTimestamp()) { | ||
| return element.getTimestamp(); | ||
| } else { | ||
| return null; | ||
| } | ||
| } | ||
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| @Override | ||
| public TimerService timerService() { | ||
| return timerService; | ||
| } | ||
| } | ||
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| private static class OnTimerContextImpl<IN, OUT> extends ProcessFunction<IN, OUT>.OnTimerContext{ | ||
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| private final TimerService timerService; | ||
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| private TimeDomain timeDomain; | ||
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| private InternalTimer<?, VoidNamespace> timer; | ||
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| OnTimerContextImpl(ProcessFunction<IN, OUT> function, TimerService timerService) { | ||
| function.super(); | ||
| this.timerService = checkNotNull(timerService); | ||
| } | ||
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| @Override | ||
| public TimeDomain timeDomain() { | ||
| checkState(timeDomain != null); | ||
| return timeDomain; | ||
| } | ||
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| @Override | ||
| public Long timestamp() { | ||
| checkState(timer != null); | ||
| return timer.getTimestamp(); | ||
| } | ||
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| @Override | ||
| public TimerService timerService() { | ||
| return timerService; | ||
| } | ||
| } | ||
| } |
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