org.apache.kafka.streams.processor.WallclockTimestampExtractor Maven / Gradle / Ivy
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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,
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* See the License for the specific language governing permissions and
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*/
package org.apache.kafka.streams.processor;
import org.apache.kafka.clients.consumer.ConsumerRecord;
/**
* Retrieves current wall clock timestamps as {@link System#currentTimeMillis()}.
*
* Using this extractor effectively provides processing-time semantics.
*
* If you need event-time semantics, use {@link FailOnInvalidTimestamp} with
* built-in CreateTime or LogAppendTime timestamp (see KIP-32: Add timestamps to Kafka message for details).
*
* @see FailOnInvalidTimestamp
* @see LogAndSkipOnInvalidTimestamp
* @see UsePartitionTimeOnInvalidTimestamp
*/
public class WallclockTimestampExtractor implements TimestampExtractor {
/**
* Return the current wall clock time as timestamp.
*
* @param record a data record
* @param partitionTime the highest extracted valid timestamp of the current record's partition˙ (could be -1 if unknown)
* @return the current wall clock time, expressed in milliseconds since midnight, January 1, 1970 UTC
*/
@Override
public long extract(final ConsumerRecord