/** | |
* 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. | |
*/ | |
namespace Kafka.Client.Producers.Partitioning | |
{ | |
using System; | |
using Kafka.Client.Utils; | |
/// <summary> | |
/// Default partitioner using hash code to calculate partition | |
/// </summary> | |
/// <typeparam name="TKey">The type of the key.</typeparam> | |
public class DefaultPartitioner<TKey> : IPartitioner<TKey> | |
where TKey : class | |
{ | |
private static readonly Random Randomizer = new Random(); | |
/// <summary> | |
/// Uses the key to calculate a partition bucket id for routing | |
/// the data to the appropriate broker partition | |
/// </summary> | |
/// <param name="key">The key.</param> | |
/// <param name="numPartitions">The num partitions.</param> | |
/// <returns>ID between 0 and numPartitions-1</returns> | |
/// <remarks> | |
/// Used hash code to calculate partition | |
/// </remarks> | |
public int Partition(TKey key, int numPartitions) | |
{ | |
Guard.Greater(numPartitions, 0, "numPartitions"); | |
return key == null | |
? Randomizer.Next(numPartitions) | |
: key.GetHashCode() % numPartitions; | |
} | |
} | |
} |