kafka PunctuationType 源码
kafka PunctuationType 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/processor/PunctuationType.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 java.time.Duration;
/**
* Controls what notion of time is used for punctuation scheduled via {@link ProcessorContext#schedule(Duration, PunctuationType, Punctuator)} schedule}:
* <ul>
* <li>STREAM_TIME - uses "stream time", which is advanced by the processing of messages
* in accordance with the timestamp as extracted by the {@link TimestampExtractor} in use.
* <b>NOTE:</b> Only advanced if messages arrive</li>
* <li>WALL_CLOCK_TIME - uses system time (the wall-clock time),
* which is advanced at the polling interval ({@link org.apache.kafka.streams.StreamsConfig#POLL_MS_CONFIG})
* independent of whether new messages arrive. <b>NOTE:</b> This is best effort only as its granularity is limited
* by how long an iteration of the processing loop takes to complete</li>
* </ul>
*/
public enum PunctuationType {
STREAM_TIME,
WALL_CLOCK_TIME,
}
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