org.apache.flink.streaming.runtime.tasks.ProcessingTimeCallback 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.flink.streaming.runtime.tasks;
import org.apache.flink.annotation.Internal;
/**
* Interface for processing-time callbacks that can be registered at a
* {@link ProcessingTimeService}.
*/
@Internal
public interface ProcessingTimeCallback {
/**
* This method is invoked with the timestamp for which the trigger was scheduled.
*
* If the triggering is delayed for whatever reason (trigger timer was blocked, JVM stalled due
* to a garbage collection), the timestamp supplied to this function will still be the original
* timestamp for which the trigger was scheduled.
*
* @param timestamp The timestamp for which the trigger event was scheduled.
*/
void onProcessingTime(long timestamp) throws Exception ;
}