org.apache.kafka.clients.producer.Partitioner Maven / Gradle / Ivy
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* (the "License"); you may not use this file except in compliance with
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*
* http://www.apache.org/licenses/LICENSE-2.0
*
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package org.apache.kafka.clients.producer;
import org.apache.kafka.common.Configurable;
import org.apache.kafka.common.Cluster;
import java.io.Closeable;
/**
* Partitioner Interface
*/
public interface Partitioner extends Configurable, Closeable {
/**
* Compute the partition for the given record.
*
* @param topic The topic name
* @param key The key to partition on (or null if no key)
* @param keyBytes The serialized key to partition on( or null if no key)
* @param value The value to partition on or null
* @param valueBytes The serialized value to partition on or null
* @param cluster The current cluster metadata
*/
int partition(String topic, Object key, byte[] keyBytes, Object value, byte[] valueBytes, Cluster cluster);
/**
* This is called when partitioner is closed.
*/
void close();
/**
* Note this method is only implemented in DefaultPartitioner and {@link UniformStickyPartitioner} which
* are now deprecated. See KIP-794 for more info.
*
* Notifies the partitioner a new batch is about to be created. When using the sticky partitioner,
* this method can change the chosen sticky partition for the new batch.
* @param topic The topic name
* @param cluster The current cluster metadata
* @param prevPartition The partition previously selected for the record that triggered a new batch
* @deprecated Since 3.3.0
*/
@Deprecated
default void onNewBatch(String topic, Cluster cluster, int prevPartition) {
}
}