├── .gitattributes ├── .gitignore ├── README.md ├── TPLDataflowHelpers.sln └── TPLDataflowHelpers ├── DisposableMultiLink.cs ├── License.txt ├── Priority.cs ├── PriorityBufferBlock.cs └── TPLDataflowHelpers.csproj /.gitattributes: -------------------------------------------------------------------------------- 1 | ############################################################################### 2 | # Set default behavior to automatically normalize line endings. 3 | ############################################################################### 4 | * text=auto 5 | 6 | ############################################################################### 7 | # Set default behavior for command prompt diff. 8 | # 9 | # This is need for earlier builds of msysgit that does not have it on by 10 | # default for csharp files. 11 | # Note: This is only used by command line 12 | ############################################################################### 13 | #*.cs diff=csharp 14 | 15 | ############################################################################### 16 | # Set the merge driver for project and solution files 17 | # 18 | # Merging from the command prompt will add diff markers to the files if there 19 | # are conflicts (Merging from VS is not affected by the settings below, in VS 20 | # the diff markers are never inserted). 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Synchronous and Asynchronous operations supported. 4 | -------------------------------------------------------------------------------- /TPLDataflowHelpers.sln: -------------------------------------------------------------------------------- 1 |  2 | Microsoft Visual Studio Solution File, Format Version 12.00 3 | # Visual Studio 15 4 | VisualStudioVersion = 15.0.27130.2036 5 | MinimumVisualStudioVersion = 10.0.40219.1 6 | Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TPLDataflowHelpers", "TPLDataflowHelpers\TPLDataflowHelpers.csproj", "{57F8842E-40D2-4FCE-84B9-8BDEF7720134}" 7 | EndProject 8 | Global 9 | GlobalSection(SolutionConfigurationPlatforms) = preSolution 10 | Debug|Any CPU = Debug|Any CPU 11 | Release|Any CPU = Release|Any CPU 12 | EndGlobalSection 13 | GlobalSection(ProjectConfigurationPlatforms) = postSolution 14 | {57F8842E-40D2-4FCE-84B9-8BDEF7720134}.Debug|Any CPU.ActiveCfg = Debug|Any CPU 15 | {57F8842E-40D2-4FCE-84B9-8BDEF7720134}.Debug|Any CPU.Build.0 = Debug|Any CPU 16 | {57F8842E-40D2-4FCE-84B9-8BDEF7720134}.Release|Any CPU.ActiveCfg = Release|Any CPU 17 | {57F8842E-40D2-4FCE-84B9-8BDEF7720134}.Release|Any CPU.Build.0 = Release|Any CPU 18 | EndGlobalSection 19 | GlobalSection(SolutionProperties) = preSolution 20 | HideSolutionNode = FALSE 21 | EndGlobalSection 22 | GlobalSection(ExtensibilityGlobals) = postSolution 23 | SolutionGuid = {128083CB-7871-473E-BD82-7138EA5A160A} 24 | EndGlobalSection 25 | EndGlobal 26 | -------------------------------------------------------------------------------- /TPLDataflowHelpers/DisposableMultiLink.cs: -------------------------------------------------------------------------------- 1 | //Copyright (c) 2018 FichterApps, LLC 2 | /* 3 | * MIT License 4 | Permission is hereby granted, free of charge, to any person obtaining a copy 5 | of this software and associated documentation files (the "Software"), to deal 6 | in the Software without restriction, including without limitation the rights 7 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 8 | copies of the Software, and to permit persons to whom the Software is 9 | furnished to do so, subject to the following conditions: 10 | 11 | The above copyright notice and this permission notice shall be included in all 12 | copies or substantial portions of the Software. 13 | 14 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 17 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 18 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 19 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 20 | SOFTWARE. 21 | * 22 | * */ 23 | 24 | using System; 25 | using System.Collections.Generic; 26 | 27 | namespace TPLDataflowHelpers 28 | { 29 | /// 30 | /// An IDisposable class that holds multiple IDisposables; used as the return value in PriorityBufferBlock.LinkTo. 31 | /// 32 | public sealed class DisposableMultiLink : IDisposable 33 | { 34 | private readonly IEnumerable _contents; 35 | public DisposableMultiLink(params IDisposable[] items) 36 | { 37 | _contents = items; 38 | } 39 | public void Dispose() 40 | { 41 | foreach (var item in _contents) 42 | item?.Dispose(); 43 | } 44 | } 45 | } 46 | -------------------------------------------------------------------------------- /TPLDataflowHelpers/License.txt: -------------------------------------------------------------------------------- 1 | Copyright (c) 2018 FichterApps, LLC 2 | 3 | MIT License 4 | Permission is hereby granted, free of charge, to any person obtaining a copy 5 | of this software and associated documentation files (the "Software"), to deal 6 | in the Software without restriction, including without limitation the rights 7 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 8 | copies of the Software, and to permit persons to whom the Software is 9 | furnished to do so, subject to the following conditions: 10 | 11 | The above copyright notice and this permission notice shall be included in all 12 | copies or substantial portions of the Software. 13 | 14 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 17 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 18 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 19 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 20 | SOFTWARE. 21 | -------------------------------------------------------------------------------- /TPLDataflowHelpers/Priority.cs: -------------------------------------------------------------------------------- 1 | //Copyright (c) 2018 FichterApps, LLC 2 | /* 3 | * MIT License 4 | Permission is hereby granted, free of charge, to any person obtaining a copy 5 | of this software and associated documentation files (the "Software"), to deal 6 | in the Software without restriction, including without limitation the rights 7 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 8 | copies of the Software, and to permit persons to whom the Software is 9 | furnished to do so, subject to the following conditions: 10 | 11 | The above copyright notice and this permission notice shall be included in all 12 | copies or substantial portions of the Software. 13 | 14 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 17 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 18 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 19 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 20 | SOFTWARE. 21 | * 22 | * */ 23 | 24 | namespace TPLDataflowHelpers 25 | { 26 | public enum Priority 27 | { 28 | High, 29 | Medium, 30 | Low 31 | } 32 | } 33 | -------------------------------------------------------------------------------- /TPLDataflowHelpers/PriorityBufferBlock.cs: -------------------------------------------------------------------------------- 1 | //Copyright (c) 2018 FichterApps, LLC 2 | /* 3 | * MIT License 4 | Permission is hereby granted, free of charge, to any person obtaining a copy 5 | of this software and associated documentation files (the "Software"), to deal 6 | in the Software without restriction, including without limitation the rights 7 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 8 | copies of the Software, and to permit persons to whom the Software is 9 | furnished to do so, subject to the following conditions: 10 | 11 | The above copyright notice and this permission notice shall be included in all 12 | copies or substantial portions of the Software. 13 | 14 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 17 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 18 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 19 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 20 | SOFTWARE. 21 | * 22 | * */ 23 | 24 | using System; 25 | using System.Collections.Concurrent; 26 | using System.Collections.Generic; 27 | using System.Threading.Tasks; 28 | using System.Threading.Tasks.Dataflow; 29 | 30 | namespace TPLDataflowHelpers 31 | { 32 | /// 33 | /// A TPL Dataflow-compatible BufferBlock supporting three priorities, Low, Medium, and High, and allowing the user to specify the DataflowBlockOptions for each internal buffer (eg., to set BoundingCapacity differently for each). 34 | /// The priority is declared when posting/sending, and that order is respected when a reservation is placed; if a higher priority item is received after a reservation has been provided, that reservation for the lower-priority item will be respected. 35 | /// Thus, it is possible that a lower-priority item will be returned even if there are higher-priority items in the buffer. 36 | /// The interface does not force this behavior, but strictly honoring the reservations was done to avoid potential reservation problems with the three internal BufferBlocks. 37 | /// 38 | /// 39 | class PriorityBufferBlock : ISourceBlock, IReceivableSourceBlock 40 | { 41 | private readonly BufferBlock _highPriorityBuffer; 42 | private readonly BufferBlock _mediumPriorityBuffer; 43 | private readonly BufferBlock _lowPriorityBuffer; 44 | /// 45 | /// Holds all messages sent to this object. Note that this collection is never emptied in this implementation, so its growth is unbounded. 46 | /// Because of the nature of this PriorityBufferBlock's use of composition, and because it's not clear when it's safe to discard old messages, that problem has been left. 47 | /// For instance, can a MessageHeader be discarded when either ReleaseReservation or ConsumeMessage is called, or is ConsumeMessage not the final link in the chain? 48 | /// 49 | private readonly ConcurrentDictionary> _messagesByBlock = new ConcurrentDictionary>(); 50 | 51 | /// 52 | /// Each internal BufferBlock is built using the provided options specified for that priority. 53 | /// 54 | /// 55 | /// 56 | /// 57 | public PriorityBufferBlock(DataflowBlockOptions highPriorityOptions, DataflowBlockOptions mediumPriorityOptions, DataflowBlockOptions lowPriorityOptions) 58 | { 59 | _highPriorityBuffer = new BufferBlock(highPriorityOptions); 60 | _mediumPriorityBuffer = new BufferBlock(mediumPriorityOptions); 61 | _lowPriorityBuffer = new BufferBlock(lowPriorityOptions); 62 | } 63 | 64 | /// 65 | /// Builds the internal buffers using the provided options. 66 | /// 67 | /// 68 | public PriorityBufferBlock(DataflowBlockOptions options) : this(options, options, options) 69 | { 70 | } 71 | 72 | /// 73 | /// Builds internal buffers with default BufferBlock options 74 | /// 75 | public PriorityBufferBlock() 76 | { 77 | _highPriorityBuffer = new BufferBlock(); 78 | _mediumPriorityBuffer = new BufferBlock(); 79 | _lowPriorityBuffer = new BufferBlock(); 80 | } 81 | 82 | public bool Any() => _highPriorityBuffer.Count > 0 || _mediumPriorityBuffer.Count > 0 || _lowPriorityBuffer.Count > 0; 83 | 84 | /// 85 | /// Asynchronously adds an item to the buffer. 86 | /// 87 | /// 88 | /// 89 | /// 90 | public Task SendAsync(T item, Priority priority) 91 | { 92 | switch (priority) 93 | { 94 | case Priority.High: 95 | return _highPriorityBuffer.SendAsync(item); 96 | case Priority.Medium: 97 | return _mediumPriorityBuffer.SendAsync(item); 98 | case Priority.Low: 99 | return _lowPriorityBuffer.SendAsync(item); 100 | default: throw new InvalidOperationException($"Priority {priority.ToString()} is invalid"); 101 | } 102 | } 103 | 104 | /// 105 | /// Synchronously adds an item to the buffer; blocking. 106 | /// 107 | /// 108 | /// 109 | public void Post(T item, Priority priority) 110 | { 111 | switch (priority) 112 | { 113 | case Priority.High: 114 | { 115 | _highPriorityBuffer.Post(item); 116 | break; 117 | } 118 | case Priority.Medium: 119 | { 120 | _mediumPriorityBuffer.Post(item); 121 | break; 122 | } 123 | case Priority.Low: 124 | { 125 | _lowPriorityBuffer.Post(item); 126 | break; 127 | } 128 | default: throw new InvalidOperationException($"Priority {priority.ToString()} is invalid"); 129 | } 130 | } 131 | #region ISourceBlock methods 132 | public Task Completion => Task.WhenAll(_lowPriorityBuffer.Completion, _mediumPriorityBuffer.Completion, _highPriorityBuffer.Completion); 133 | 134 | public void Complete() 135 | { 136 | _lowPriorityBuffer.Complete(); 137 | _mediumPriorityBuffer.Complete(); 138 | _highPriorityBuffer.Complete(); 139 | } 140 | 141 | T ISourceBlock.ConsumeMessage(DataflowMessageHeader messageHeader, ITargetBlock target, out bool messageConsumed) 142 | { 143 | if (_messagesByBlock.TryGetValue(messageHeader, out var block)) 144 | return block.ConsumeMessage(messageHeader, target, out messageConsumed); 145 | else 146 | throw new InvalidOperationException("reservation not found for messageheader"); 147 | } 148 | 149 | void IDataflowBlock.Fault(Exception exception) 150 | { 151 | (_lowPriorityBuffer as ISourceBlock).Fault(exception); 152 | (_mediumPriorityBuffer as ISourceBlock).Fault(exception); 153 | (_highPriorityBuffer as ISourceBlock).Fault(exception); 154 | } 155 | 156 | public IDisposable LinkTo(ITargetBlock target, DataflowLinkOptions linkOptions) 157 | { 158 | var l1 = _lowPriorityBuffer.LinkTo(target, linkOptions); 159 | var l2 = _mediumPriorityBuffer.LinkTo(target, linkOptions); 160 | var l3 = _highPriorityBuffer.LinkTo(target, linkOptions); 161 | return new DisposableMultiLink(l1, l2, l3); 162 | } 163 | 164 | void ISourceBlock.ReleaseReservation(DataflowMessageHeader messageHeader, ITargetBlock target) 165 | { 166 | if (_messagesByBlock.TryGetValue(messageHeader, out var block)) 167 | block.ReleaseReservation(messageHeader, target); 168 | } 169 | 170 | bool ISourceBlock.ReserveMessage(DataflowMessageHeader messageHeader, ITargetBlock target) 171 | { 172 | if (_highPriorityBuffer.Count > 0) 173 | { 174 | _messagesByBlock.TryAdd(messageHeader, _highPriorityBuffer); 175 | return (_highPriorityBuffer as ISourceBlock).ReserveMessage(messageHeader, target); 176 | } 177 | else if (_mediumPriorityBuffer.Count > 0) 178 | { 179 | _messagesByBlock.TryAdd(messageHeader, _mediumPriorityBuffer); 180 | return (_mediumPriorityBuffer as ISourceBlock).ReserveMessage(messageHeader, target); 181 | } 182 | else 183 | { 184 | _messagesByBlock.TryAdd(messageHeader, _lowPriorityBuffer); 185 | return (_lowPriorityBuffer as ISourceBlock).ReserveMessage(messageHeader, target); 186 | } 187 | } 188 | #endregion 189 | #region IReceivableSourceBlock methods 190 | public bool TryReceive(Predicate filter, out T item) 191 | { 192 | if (_highPriorityBuffer.Count > 0 && _highPriorityBuffer.TryReceive(filter, out item)) 193 | return true; 194 | else if (_mediumPriorityBuffer.Count > 0 && _mediumPriorityBuffer.TryReceive(filter, out item)) 195 | return true; 196 | else if (_lowPriorityBuffer.TryReceive(filter, out item)) 197 | return true; 198 | else 199 | { 200 | item = default(T); 201 | return false; 202 | } 203 | } 204 | 205 | public bool TryReceiveAll(out IList items) 206 | { 207 | var lowSuccess =_lowPriorityBuffer.TryReceiveAll(out var low); 208 | var medSuccess = _mediumPriorityBuffer.TryReceiveAll(out var medium); 209 | var highSuccess = _highPriorityBuffer.TryReceiveAll(out var high); 210 | var output = new List(); 211 | if (highSuccess) 212 | output.AddRange(high); 213 | if (medSuccess) 214 | output.AddRange(medium); 215 | if (lowSuccess) 216 | output.AddRange(low); 217 | 218 | items = output; 219 | return lowSuccess || medSuccess || highSuccess; 220 | } 221 | #endregion 222 | } 223 | } 224 | -------------------------------------------------------------------------------- /TPLDataflowHelpers/TPLDataflowHelpers.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | netstandard2.0 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | --------------------------------------------------------------------------------