kafka Partitioner 源码
kafka Partitioner 代码
文件路径：/clients/src/main/java/org/apache/kafka/clients/producer/Partitioner.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.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 DefatultPartitioner and 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
default void onNewBatch(String topic, Cluster cluster, int prevPartition) {
}
}
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