blob: 3a2b5631e38fdb39bcbee113330928953642fe4a [file] [log] [blame]
/*
* Licensed 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 DotPulsar
{
using Abstractions;
using HashDepot;
using System;
using System.Text;
/// <summary>
/// If no key is provided, the producer will randomly pick one single partition and publish all the messages
/// into that partition. While if a key is specified on the message, the partitioned producer will hash the
/// key and assign message to a particular partition.
/// </summary>
public sealed class SinglePartitionRouter : IMessageRouter
{
private int? _partitionIndex;
internal SinglePartitionRouter(int? partitionIndex = null)
{
_partitionIndex = partitionIndex;
}
/// <summary>
/// Choose a partition in single partition routing mode
/// </summary>
public int ChoosePartition(MessageMetadata? messageMetadata, int partitionsCount)
{
if (messageMetadata != null && !string.IsNullOrEmpty(messageMetadata.Key))
{
return (int) MurmurHash3.Hash32(Encoding.UTF8.GetBytes(messageMetadata.Key ?? string.Empty), 0) % partitionsCount;
}
_partitionIndex ??= new Random().Next(0, partitionsCount);
return _partitionIndex.Value;
}
}
}