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| 1 | +#region Copyright notice and license |
| 2 | + |
| 3 | +// Copyright 2019 The gRPC Authors |
| 4 | +// |
| 5 | +// Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | +// you may not use this file except in compliance with the License. |
| 7 | +// You may obtain a copy of the License at |
| 8 | +// |
| 9 | +// http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | +// |
| 11 | +// Unless required by applicable law or agreed to in writing, software |
| 12 | +// distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | +// See the License for the specific language governing permissions and |
| 15 | +// limitations under the License. |
| 16 | + |
| 17 | +#endregion |
| 18 | + |
| 19 | +using System.Threading.Channels; |
| 20 | +using DataChannel; |
| 21 | +using Grpc.Core; |
| 22 | + |
| 23 | +namespace Server |
| 24 | +{ |
| 25 | + public class DataChannelerService : DataChanneler.DataChannelerBase |
| 26 | + { |
| 27 | + private readonly ILogger _logger; |
| 28 | + |
| 29 | + public DataChannelerService(ILoggerFactory loggerFactory) |
| 30 | + { |
| 31 | + _logger = loggerFactory.CreateLogger<DataChannelerService>(); |
| 32 | + } |
| 33 | + |
| 34 | + public override async Task<DataResult> UploadData( |
| 35 | + IAsyncStreamReader<DataRequest> requestStream, ServerCallContext context) |
| 36 | + { |
| 37 | + var channel = Channel.CreateBounded<DataRequest>(new BoundedChannelOptions(capacity: 5) |
| 38 | + { |
| 39 | + SingleReader = false, |
| 40 | + SingleWriter = true |
| 41 | + }); |
| 42 | + |
| 43 | + var readTask = Task.Run(async () => |
| 44 | + { |
| 45 | + await foreach (var message in requestStream.ReadAllAsync()) |
| 46 | + { |
| 47 | + await channel.Writer.WriteAsync(message); |
| 48 | + } |
| 49 | + |
| 50 | + channel.Writer.Complete(); |
| 51 | + }); |
| 52 | + |
| 53 | + // Process incoming messages on three threads. |
| 54 | + var bytesProcessedByThread = await Task.WhenAll( |
| 55 | + ProcessMessagesAsync(channel.Reader, _logger), |
| 56 | + ProcessMessagesAsync(channel.Reader, _logger), |
| 57 | + ProcessMessagesAsync(channel.Reader, _logger)); |
| 58 | + |
| 59 | + await readTask; |
| 60 | + |
| 61 | + return new DataResult { BytesProcessed = bytesProcessedByThread.Sum() }; |
| 62 | + |
| 63 | + static async Task<int> ProcessMessagesAsync(ChannelReader<DataRequest> reader, ILogger logger) |
| 64 | + { |
| 65 | + var total = 0; |
| 66 | + await foreach (var message in reader.ReadAllAsync()) |
| 67 | + { |
| 68 | + total += message.Value.Length; |
| 69 | + } |
| 70 | + return total; |
| 71 | + } |
| 72 | + } |
| 73 | + |
| 74 | + public override async Task DownloadResults(DataRequest request, |
| 75 | + IServerStreamWriter<DataResult> responseStream, ServerCallContext context) |
| 76 | + { |
| 77 | + var channel = Channel.CreateBounded<DataResult>(new BoundedChannelOptions(capacity: 5) |
| 78 | + { |
| 79 | + SingleReader = true, |
| 80 | + SingleWriter = false |
| 81 | + }); |
| 82 | + |
| 83 | + var consumerTask = Task.Run(async () => |
| 84 | + { |
| 85 | + // Consume messages from channel and write to response stream. |
| 86 | + await foreach (var message in channel.Reader.ReadAllAsync()) |
| 87 | + { |
| 88 | + await responseStream.WriteAsync(message); |
| 89 | + } |
| 90 | + }); |
| 91 | + |
| 92 | + var dataChunks = request.Value.Chunk(size: 10); |
| 93 | + |
| 94 | + // Write messages to channel from multiple threads. |
| 95 | + await Task.WhenAll(dataChunks.Select( |
| 96 | + async c => |
| 97 | + { |
| 98 | + var message = new DataResult { BytesProcessed = c.Length }; |
| 99 | + await channel.Writer.WriteAsync(message); |
| 100 | + })); |
| 101 | + |
| 102 | + // Complete writing and wait for consumer to complete. |
| 103 | + channel.Writer.Complete(); |
| 104 | + await consumerTask; |
| 105 | + } |
| 106 | + } |
| 107 | +} |
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