kafka WallclockTimestampExtractor 源码
kafka WallclockTimestampExtractor 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/processor/WallclockTimestampExtractor.java
/*
* 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.kafka.streams.processor;
import org.apache.kafka.clients.consumer.ConsumerRecord;
/**
* Retrieves current wall clock timestamps as {@link System#currentTimeMillis()}.
* <p>
* Using this extractor effectively provides <i>processing-time</i> semantics.
* <p>
* If you need <i>event-time</i> semantics, use {@link FailOnInvalidTimestamp} with
* built-in <i>CreateTime</i> or <i>LogAppendTime</i> 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<Object, Object> record, final long partitionTime) {
return System.currentTimeMillis();
}
}
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