org.apache.flink.streaming.api.operators.TimestampedCollector Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
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* 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,
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* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.flink.streaming.api.operators;
import org.apache.flink.annotation.Internal;
import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
import org.apache.flink.util.Collector;
/**
* Wrapper around an {@link Output} for user functions that expect a {@link Collector}.
* Before giving the {@link TimestampedCollector} to a user function you must set
* the timestamp that should be attached to emitted elements. Most operators
* would set the timestamp of the incoming
* {@link org.apache.flink.streaming.runtime.streamrecord.StreamRecord} here.
*
* @param The type of the elements that can be emitted.
*/
@Internal
public class TimestampedCollector implements Collector {
private final Output> output;
private final StreamRecord reuse;
/**
* Creates a new {@link TimestampedCollector} that wraps the given {@link Output}.
*/
public TimestampedCollector(Output> output) {
this.output = output;
this.reuse = new StreamRecord(null);
}
@Override
public void collect(T record) {
output.collect(reuse.replace(record));
}
public void setTimestamp(StreamRecord timestampBase) {
if (timestampBase.hasTimestamp()) {
reuse.setTimestamp(timestampBase.getTimestamp());
} else {
reuse.eraseTimestamp();
}
}
public void setAbsoluteTimestamp(long timestamp) {
reuse.setTimestamp(timestamp);
}
public void eraseTimestamp() {
reuse.eraseTimestamp();
}
@Override
public void close() {
output.close();
}
}