| /* |
| * 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.Threading; |
| |
| /// <summary> |
| /// The round robin partition messages router, which is the default router. |
| /// If a key is provided, the producer will hash the key and publish the message to a particular partition. |
| /// If a key is not provided, the producer will publish messages across all partitions in a round-robin fashion to achieve maximum throughput. |
| /// </summary> |
| public sealed class RoundRobinPartitionRouter : IMessageRouter |
| { |
| private int _partitionIndex; |
| |
| /// <summary> |
| /// Initializes a new instance of the round robin partition router |
| /// </summary> |
| public RoundRobinPartitionRouter() |
| { |
| _partitionIndex = -1; |
| } |
| |
| /// <summary> |
| /// Choose a partition in round robin routing mode |
| /// </summary> |
| public int ChoosePartition(MessageMetadata messageMetadata, int numberOfPartitions) |
| { |
| var keyBytes = messageMetadata.KeyBytes; |
| if (keyBytes is not null && keyBytes.Length > 0) |
| return (int) MurmurHash3.Hash32(keyBytes, 0) % numberOfPartitions; |
| |
| return Interlocked.Increment(ref _partitionIndex) % numberOfPartitions; |
| } |
| } |