org.apache.flink.streaming.api.operators.KeyContext 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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*/
package org.apache.flink.streaming.api.operators;
/**
* Inteface for setting and querying the current key of keyed operations.
*
* This is mainly used by the timer system to query the key when creating timers and to set the
* correct key context when firing a timer.
*/
public interface KeyContext {
void setCurrentKey(Object key);
Object getCurrentKey();
}