org.apache.flink.streaming.api.operators.StreamFlatMap Maven / Gradle / Ivy
/*
* 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;
import org.apache.flink.annotation.Internal;
import org.apache.flink.api.common.functions.FlatMapFunction;
import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
/** A {@link StreamOperator} for executing {@link FlatMapFunction FlatMapFunctions}. */
@Internal
public class StreamFlatMap extends AbstractUdfStreamOperator>
implements OneInputStreamOperator {
private static final long serialVersionUID = 1L;
private transient TimestampedCollector collector;
public StreamFlatMap(FlatMapFunction flatMapper) {
super(flatMapper);
chainingStrategy = ChainingStrategy.ALWAYS;
}
@Override
public void open() throws Exception {
super.open();
collector = new TimestampedCollector<>(output);
}
@Override
public void processElement(StreamRecord element) throws Exception {
collector.setTimestamp(element);
userFunction.flatMap(element.getValue(), collector);
}
}