| | | 1 | | /* |
| | | 2 | | * Copyright 2017 Stanislav Muhametsin. All rights Reserved. |
| | | 3 | | * |
| | | 4 | | * Licensed under the Apache License, Version 2.0 (the "License"); |
| | | 5 | | * you may not use this file except in compliance with the License. |
| | | 6 | | * You may obtain a copy of the License at |
| | | 7 | | * |
| | | 8 | | * http://www.apache.org/licenses/LICENSE-2.0 |
| | | 9 | | * |
| | | 10 | | * Unless required by applicable law or agreed to in writing, software |
| | | 11 | | * distributed under the License is distributed on an "AS IS" BASIS, |
| | | 12 | | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
| | | 13 | | * implied. |
| | | 14 | | * |
| | | 15 | | * See the License for the specific language governing permissions and |
| | | 16 | | * limitations under the License. |
| | | 17 | | */ |
| | | 18 | | using AsyncEnumeration.Abstractions; |
| | | 19 | | using System; |
| | | 20 | | using System.Collections.Generic; |
| | | 21 | | using System.Text; |
| | | 22 | | using System.Threading; |
| | | 23 | | using System.Threading.Tasks; |
| | | 24 | | using UtilPack; |
| | | 25 | | using TSequentialCurrentInfoFactory = System.Func<System.Object, AsyncEnumeration.Implementation.Enumerable.EnumerationE |
| | | 26 | | |
| | | 27 | | namespace AsyncEnumeration.Implementation.Enumerable |
| | | 28 | | { |
| | | 29 | | /// <summary> |
| | | 30 | | /// This class provides static factory methods to create objects of type <see cref="IAsyncEnumerator{T}"/>. |
| | | 31 | | /// </summary> |
| | | 32 | | public static class AsyncEnumerationFactory |
| | | 33 | | { |
| | | 34 | | /// <summary> |
| | | 35 | | /// Creates a new <see cref="IAsyncEnumerable{T}"/> which will use the given callback as implementation for <see c |
| | | 36 | | /// </summary> |
| | | 37 | | /// <typeparam name="T">The type of items being iterated.</typeparam> |
| | | 38 | | /// <param name="getEnumerator">The callback for <see cref="IAsyncEnumerable{T}.GetAsyncEnumerator"/> implementati |
| | | 39 | | /// <param name="asyncProvider">The <see cref="IAsyncProvider"/> to use.</param> |
| | | 40 | | /// <returns>A new instance of <see cref="IAsyncEnumerable{T}"/> with given parameters.</returns> |
| | | 41 | | /// <exception cref="ArgumentNullException">If either of <paramref name="getEnumerator"/> or <paramref name="async |
| | | 42 | | public static IAsyncEnumerable<T> FromGeneratorCallback<T>( |
| | | 43 | | Func<IAsyncEnumerator<T>> getEnumerator, |
| | | 44 | | IAsyncProvider asyncProvider |
| | | 45 | | ) |
| | | 46 | | { |
| | | 47 | | return new AsyncEnumerableFunctionalWrapper<T>( asyncProvider, getEnumerator ); |
| | | 48 | | } |
| | | 49 | | |
| | | 50 | | /// <summary> |
| | | 51 | | /// Creates a new <see cref="IAsyncEnumerable{T}"/> which will use the given callback as implementation for <see c |
| | | 52 | | /// </summary> |
| | | 53 | | /// <typeparam name="T">The type of items being iterated.</typeparam> |
| | | 54 | | /// <typeparam name="TArg">The type of argument for the callback.</typeparam> |
| | | 55 | | /// <param name="arg">The argument for the <paramref name="getEnumerator"/> callback.</param> |
| | | 56 | | /// <param name="getEnumerator">The callback for <see cref="IAsyncEnumerable{T}.GetAsyncEnumerator"/> implementati |
| | | 57 | | /// <param name="asyncProvider">The <see cref="IAsyncProvider"/> to use.</param> |
| | | 58 | | /// <returns>A new instance of <see cref="IAsyncEnumerable{T}"/> with given parameters.</returns> |
| | | 59 | | /// <exception cref="ArgumentNullException">If either of <paramref name="getEnumerator"/> or <paramref name="async |
| | | 60 | | public static IAsyncEnumerable<T> FromGeneratorCallback<T, TArg>( |
| | | 61 | | TArg arg, |
| | | 62 | | Func<TArg, IAsyncEnumerator<T>> getEnumerator, |
| | | 63 | | IAsyncProvider asyncProvider |
| | | 64 | | ) |
| | | 65 | | { |
| | | 66 | | return new AsyncEnumerableFunctionalWrapper<T, TArg>( asyncProvider, arg, getEnumerator ); |
| | | 67 | | } |
| | | 68 | | |
| | | 69 | | /// <summary> |
| | | 70 | | /// Creates a new instance of <see cref="IAsyncEnumerable{T}"/> with given callback to create <see cref="Sequentia |
| | | 71 | | /// </summary> |
| | | 72 | | /// <typeparam name="T">The type of items being enumerated.</typeparam> |
| | | 73 | | /// <param name="enumerationStart">The callback to create a new <see cref="SequentialEnumerationStartInfo{T}"/> fo |
| | | 74 | | /// <param name="asyncProvider">The <see cref="IAsyncProvider"/> for the returned <see cref="IAsyncEnumerable{T}"/ |
| | | 75 | | /// <returns>A new instance of <see cref="IAsyncEnumerable{T}"/> which behaves like <see cref="SequentialEnumerati |
| | | 76 | | /// <remarks> |
| | | 77 | | /// If <paramref name="enumerationStart"/> is <c>null</c>, then result is empty enumerable. |
| | | 78 | | /// </remarks> |
| | | 79 | | /// <seealso cref="CreateSequentialStartInfo{T}(MoveNextAsyncDelegate{T}, EnumerationEndedDelegate)"/> |
| | | 80 | | public static IAsyncEnumerable<T> CreateSequentialEnumerable<T>( |
| | | 81 | | Func<SequentialEnumerationStartInfo<T>> enumerationStart, |
| | | 82 | | IAsyncProvider asyncProvider |
| | | 83 | | ) => enumerationStart == null ? EmptyAsync<T>.Enumerable : new AsyncSequentialOnlyEnumerable<T>( enumerationSta |
| | | 84 | | |
| | | 85 | | /// <summary> |
| | | 86 | | /// Creates a new <see cref="IAsyncEnumerable{T}"/> which will allow at most one <see cref="IAsyncEnumerator{T}"/> |
| | | 87 | | /// </summary> |
| | | 88 | | /// <typeparam name="T">The type of items being enumerated.</typeparam> |
| | | 89 | | /// <param name="startInfo">The <see cref="SequentialEnumerationStartInfo{T}"/> containing callbacks to use.</para |
| | | 90 | | /// <param name="asyncProvider">The <see cref="IAsyncProvider"/> for the returned <see cref="IAsyncEnumerable{T}"/ |
| | | 91 | | /// <returns>A new instance of <see cref="IAsyncEnumerable{T}"/> which behaves like callbacks in <paramref name="s |
| | | 92 | | public static IAsyncEnumerable<T> CreateExclusiveSequentialEnumerable<T>( |
| | | 93 | | SequentialEnumerationStartInfo<T> startInfo, |
| | | 94 | | IAsyncProvider asyncProvider |
| | | 95 | | ) => new AsyncEnumerableExclusive<T>( SequentialCurrentInfoFactory.GetInstance( startInfo.MoveNext, startInfo.D |
| | | 96 | | |
| | | 97 | | /// <summary> |
| | | 98 | | /// Helper method to invoke constructor of <see cref="SequentialEnumerationStartInfo{T}"/> without explicitly spec |
| | | 99 | | /// </summary> |
| | | 100 | | /// <typeparam name="T">The type of items being enumerated.</typeparam> |
| | | 101 | | /// <param name="moveNext">The callback for potentially asynchronously fetching next item.</param> |
| | | 102 | | /// <param name="dispose">The callback to dispose enumerator.</param> |
| | | 103 | | /// <returns>A new <see cref="SequentialEnumerationStartInfo{T}"/>.</returns> |
| | | 104 | | /// <seealso cref="SequentialEnumerationStartInfo{T}.SequentialEnumerationStartInfo(MoveNextAsyncDelegate{T}, Enum |
| | | 105 | | public static SequentialEnumerationStartInfo<T> CreateSequentialStartInfo<T>( |
| | | 106 | | MoveNextAsyncDelegate<T> moveNext, |
| | | 107 | | EnumerationEndedDelegate dispose |
| | | 108 | | ) => new SequentialEnumerationStartInfo<T>( moveNext, dispose ); |
| | | 109 | | |
| | | 110 | | /// <summary> |
| | | 111 | | /// Creates a new instance of <see cref="IAsyncEnumerator{T}"/> which fetches one item at a time using given callb |
| | | 112 | | /// </summary> |
| | | 113 | | /// <typeparam name="T">The type of items being enumerated.</typeparam> |
| | | 114 | | /// <param name="moveNext">The callback for potentially asynchronously fetching next item.</param> |
| | | 115 | | /// <param name="dispose">The callback to dispose enumerator.</param> |
| | | 116 | | /// <returns>A new instance of <see cref="IAsyncEnumerator{T}"/> which behaves like <paramref name="moveNext"/> an |
| | | 117 | | /// <remarks> |
| | | 118 | | /// The returned <see cref="IAsyncEnumerator{T}"/> will have guard code to prevent concurrent invocation. |
| | | 119 | | /// </remarks> |
| | | 120 | | public static IAsyncEnumerator<T> CreateSequentialEnumerator<T>( |
| | | 121 | | MoveNextAsyncDelegate<T> moveNext, |
| | | 122 | | EnumerationEndedDelegate dispose |
| | | 123 | | ) => new AsyncEnumerator<T>( SequentialCurrentInfoFactory.GetInstance( moveNext, dispose ) ); |
| | | 124 | | |
| | | 125 | | /// <summary> |
| | | 126 | | /// This creates a <see cref="IAsyncEnumerable{T}"/> that will behave like the given set of delegates. |
| | | 127 | | /// Each enumeration is assumed to have inner state, meaning that the call to create delegates is done on every ca |
| | | 128 | | /// </summary> |
| | | 129 | | /// <typeparam name="T">The type of items being enumerated.</typeparam> |
| | | 130 | | /// <param name="startInfoFactory">The callback creating a structure containing all the delegates that the calls t |
| | | 131 | | /// <param name="asyncProvider">The <see cref="IAsyncProvider"/> for the returned <see cref="IAsyncEnumerable{T}"/ |
| | | 132 | | /// <returns>A new <see cref="IAsyncEnumerable{T}"/>, which will call the given <paramref name="startInfoFactory"/ |
| | | 133 | | /// <exception cref="ArgumentNullException">If <paramref name="startInfoFactory"/> is <c>null</c>.</exception> |
| | | 134 | | /// <seealso cref="WrappingEnumerationStartInfo{T}"/> |
| | | 135 | | /// <seealso cref="CreateWrappingStartInfo"/> |
| | | 136 | | public static IAsyncEnumerable<T> CreateStatefulWrappingEnumerable<T>( |
| | | 137 | | Func<WrappingEnumerationStartInfo<T>> startInfoFactory, |
| | | 138 | | IAsyncProvider asyncProvider |
| | | 139 | | ) |
| | | 140 | | { |
| | | 141 | | return new StatefulAsyncEnumerableWrapper<T>( startInfoFactory, asyncProvider ); |
| | | 142 | | } |
| | | 143 | | |
| | | 144 | | /// <summary> |
| | | 145 | | /// This creates a <see cref="IAsyncEnumerable{T}"/> that will behave like the given set of delegates. |
| | | 146 | | /// Each enumeration is assumed to be stateless, meaning that the same set of delegates is shared by all instances |
| | | 147 | | /// </summary> |
| | | 148 | | /// <typeparam name="T">The type of items being enumerated.</typeparam> |
| | | 149 | | /// <param name="startInfo">The <see cref="WrappingEnumerationStartInfo{T}"/> containing delegates that capture al |
| | | 150 | | /// <returns>A new <see cref="IAsyncEnumerable{T}"/>, which will share the given delegates by all instances return |
| | | 151 | | /// <param name="asyncProvider">The <see cref="IAsyncProvider"/> for the returned <see cref="IAsyncEnumerable{T}"/ |
| | | 152 | | /// <exception cref="ArgumentNullException">If either of <see cref="WrappingEnumerationStartInfo{T}.WaitForNext"/> |
| | | 153 | | /// <seealso cref="WrappingEnumerationStartInfo{T}"/> |
| | | 154 | | /// <seealso cref="CreateWrappingStartInfo"/> |
| | | 155 | | public static IAsyncEnumerable<T> CreateStatelessWrappingEnumerable<T>( |
| | | 156 | | WrappingEnumerationStartInfo<T> startInfo, |
| | | 157 | | IAsyncProvider asyncProvider |
| | | 158 | | ) |
| | | 159 | | { |
| | | 160 | | return new StatelessAsyncEnumerableWrapper<T>( startInfo, asyncProvider ); |
| | | 161 | | } |
| | | 162 | | |
| | | 163 | | /// <summary> |
| | | 164 | | /// This creates a <see cref="IAsyncEnumerator{T}"/> that will behave like the given set of delegates. |
| | | 165 | | /// </summary> |
| | | 166 | | /// <typeparam name="T">The type of items being enumerated.</typeparam> |
| | | 167 | | /// <param name="startInfo">The <see cref="WrappingEnumerationStartInfo{T}"/> containing delegates that capture al |
| | | 168 | | /// <returns>A new <see cref="IAsyncEnumerator{T}"/>, which will behave like the given set of delegates.</returns> |
| | | 169 | | /// <exception cref="ArgumentNullException">If either of <see cref="WrappingEnumerationStartInfo{T}.WaitForNext"/> |
| | | 170 | | /// <seealso cref="WrappingEnumerationStartInfo{T}"/> |
| | | 171 | | /// <seealso cref="CreateWrappingStartInfo"/> |
| | | 172 | | public static IAsyncEnumerator<T> CreateWrappingEnumerator<T>( |
| | | 173 | | WrappingEnumerationStartInfo<T> startInfo |
| | | 174 | | ) |
| | | 175 | | { |
| | | 176 | | return new AsyncEnumeratorWrapper<T>( startInfo ); |
| | | 177 | | } |
| | | 178 | | |
| | | 179 | | /// <summary> |
| | | 180 | | /// Helper method to invoke constructor of <see cref="WrappingEnumerationStartInfo{T}"/> without explicitly speci |
| | | 181 | | /// </summary> |
| | | 182 | | /// <typeparam name="T">The type of items being enumerated.</typeparam> |
| | | 183 | | /// <param name="waitForNext">The callback that will be used by <see cref="IAsyncEnumerator{T}.WaitForNextAsync"/> |
| | | 184 | | /// <param name="tryGetNext">The callback that will be used by <see cref="IAsyncEnumerator{T}.TryGetNext"/>.</para |
| | | 185 | | /// <param name="dispose">The optional callback that will be used by <see cref="IAsyncDisposable.DisposeAsync"/>.< |
| | | 186 | | /// <returns>A new instance of <see cref="WrappingEnumerationStartInfo{T}"/>.</returns> |
| | | 187 | | /// <exception cref="ArgumentNullException">If either of <paramref name="waitForNext"/> or <paramref name="tryGetN |
| | | 188 | | /// <seealso cref="WrappingEnumerationStartInfo{T}"/> |
| | | 189 | | public static WrappingEnumerationStartInfo<T> CreateWrappingStartInfo<T>( |
| | | 190 | | WaitForNextDelegate waitForNext, |
| | | 191 | | TryGetNextDelegate<T> tryGetNext, |
| | | 192 | | EnumerationEndedDelegate dispose |
| | | 193 | | ) |
| | | 194 | | { |
| | | 195 | | return new WrappingEnumerationStartInfo<T>( waitForNext, tryGetNext, dispose ); |
| | | 196 | | } |
| | | 197 | | |
| | | 198 | | /// <summary> |
| | | 199 | | /// Helper method to create <see cref="WrappingEnumerationStartInfo{T}"/> which will return <c>true</c> only once |
| | | 200 | | /// </summary> |
| | | 201 | | /// <typeparam name="T">The type of items being enumerated.</typeparam> |
| | | 202 | | /// <param name="tryGetNext">The callback to get next item.</param> |
| | | 203 | | /// <param name="dispose">The optional disposing callback.</param> |
| | | 204 | | /// <returns></returns> |
| | | 205 | | public static WrappingEnumerationStartInfo<T> CreateSynchronousWrappingStartInfo<T>( |
| | | 206 | | TryGetNextDelegate<T> tryGetNext, |
| | | 207 | | EnumerationEndedDelegate dispose = null |
| | | 208 | | ) |
| | | 209 | | { |
| | | 210 | | const Int32 INITIAL = 0; |
| | | 211 | | const Int32 STARTED = 1; |
| | | 212 | | var state = INITIAL; |
| | | 213 | | return CreateWrappingStartInfo( |
| | | 214 | | () => |
| | | 215 | | { |
| | | 216 | | return TaskUtils.TaskFromBoolean( Interlocked.CompareExchange( ref state, STARTED, INITIAL ) == INITIAL ) |
| | | 217 | | }, |
| | | 218 | | tryGetNext, |
| | | 219 | | dispose |
| | | 220 | | ); |
| | | 221 | | |
| | | 222 | | } |
| | | 223 | | } |
| | | 224 | | |
| | | 225 | | internal static class SequentialCurrentInfoFactory |
| | | 226 | | { |
| | 1 | 227 | | private static readonly Dictionary<Type, TSequentialCurrentInfoFactory> CustomFactories = new Dictionary<Type, TSe |
| | 1 | 228 | | { |
| | 8 | 229 | | { typeof(Int32), (moveNext, disposeAsync) => new SequentialEnumeratorCurrentInfoWithInt32((MoveNextAsyncDelegat |
| | 2 | 230 | | { typeof(Int64), (moveNext, disposeAsync) => new SequentialEnumeratorCurrentInfoWithInt64((MoveNextAsyncDelegat |
| | 2 | 231 | | { typeof(Single), (moveNext, disposeAsync) => new SequentialEnumeratorCurrentInfoWithFloat32((MoveNextAsyncDele |
| | 2 | 232 | | { typeof(Double), (moveNext, disposeAsync) => new SequentialEnumeratorCurrentInfoWithFloat64((MoveNextAsyncDele |
| | 1 | 233 | | }; |
| | | 234 | | |
| | | 235 | | internal static TSequentialCurrentInfoFactory GetFactory( Type type ) |
| | | 236 | | { |
| | 11 | 237 | | CustomFactories.TryGetValue( type, out var retVal ); |
| | 11 | 238 | | return retVal; |
| | | 239 | | } |
| | | 240 | | |
| | | 241 | | internal static SequentialEnumeratorCurrentInfo<T> GetInstance<T>( |
| | | 242 | | MoveNextAsyncDelegate<T> moveNext, |
| | | 243 | | EnumerationEndedDelegate dispose |
| | | 244 | | ) |
| | | 245 | | { |
| | 11 | 246 | | return (SequentialEnumeratorCurrentInfo<T>) GetFactory( typeof( T ) )?.Invoke( moveNext, dispose ) ?? new Seque |
| | | 247 | | } |
| | | 248 | | } |
| | | 249 | | |
| | | 250 | | /// <summary> |
| | | 251 | | /// This delegate will be used by the <see cref="IAsyncEnumerator{T}.WaitForNextAsync"/> method of <see cref="IAsyncE |
| | | 252 | | /// </summary> |
| | | 253 | | /// <typeparam name="T">The type of the items being enumerated.</typeparam> |
| | | 254 | | /// <returns>A value task with information about next item fetched.</returns> |
| | | 255 | | /// <remarks> |
| | | 256 | | /// The information is a tuple, where the elements are interpreted as following: |
| | | 257 | | /// <list type="number"> |
| | | 258 | | /// <item><term><see cref="System.Boolean"/></term><description>Whether this fetch was a success. If enumerable has n |
| | | 259 | | /// <item><term><typeparamref name="T"/></term><description>The item fetched.</description></item> |
| | | 260 | | /// </list> |
| | | 261 | | /// </remarks> |
| | | 262 | | /// <seealso cref="AsyncEnumerationFactory.CreateSequentialEnumerator{T}(MoveNextAsyncDelegate{T}, EnumerationEndedDe |
| | | 263 | | public delegate ValueTask<(Boolean, T)> MoveNextAsyncDelegate<T>(); |
| | | 264 | | |
| | | 265 | | /// <summary> |
| | | 266 | | /// This delegate will be used by <see cref="IAsyncDisposable.DisposeAsync"/> methods when enumeration end is encount |
| | | 267 | | /// </summary> |
| | | 268 | | /// <returns>A task to perform asynchronous disposing. If no asynchronous disposing is needed, this delegate can retu |
| | | 269 | | /// <seealso cref="AsyncEnumerationFactory.CreateSequentialEnumerator{T}(MoveNextAsyncDelegate{T}, EnumerationEndedDe |
| | | 270 | | public delegate Task EnumerationEndedDelegate(); |
| | | 271 | | |
| | | 272 | | /// <summary> |
| | | 273 | | /// This struct captures information required for callback-based <see cref="IAsyncEnumerator{T}"/>. |
| | | 274 | | /// </summary> |
| | | 275 | | /// <typeparam name="T">The type of items being enumerated.</typeparam> |
| | | 276 | | /// <seealso cref="AsyncEnumerationFactory.CreateSequentialEnumerable"/> |
| | | 277 | | /// <seealso cref="AsyncEnumerationFactory.CreateSequentialStartInfo"/> |
| | | 278 | | public struct SequentialEnumerationStartInfo<T> |
| | | 279 | | { |
| | | 280 | | /// <summary> |
| | | 281 | | /// Initializes a new <see cref="SequentialEnumerationStartInfo{T}"/> with given callbacks. |
| | | 282 | | /// </summary> |
| | | 283 | | /// <param name="moveNext">The callback to fetch next item.</param> |
| | | 284 | | /// <param name="dispose">The optional callback to dispose enumerator. May be <c>null</c>.</param> |
| | | 285 | | /// <remarks> |
| | | 286 | | /// If <paramref name="moveNext"/> is <c>null</c>, then enumeration ends immediately. |
| | | 287 | | /// </remarks> |
| | | 288 | | /// <seealso cref="AsyncEnumerationFactory.CreateSequentialStartInfo"/> |
| | | 289 | | public SequentialEnumerationStartInfo( |
| | | 290 | | MoveNextAsyncDelegate<T> moveNext, |
| | | 291 | | EnumerationEndedDelegate dispose |
| | | 292 | | ) |
| | | 293 | | { |
| | | 294 | | this.MoveNext = moveNext; |
| | | 295 | | this.Dispose = dispose; |
| | | 296 | | } |
| | | 297 | | |
| | | 298 | | /// <summary> |
| | | 299 | | /// Gets the callback to potentially asynchronously fetch the next item. |
| | | 300 | | /// </summary> |
| | | 301 | | /// <value>The callback to potentially asynchronously fetch the next item.</value> |
| | | 302 | | public MoveNextAsyncDelegate<T> MoveNext { get; } |
| | | 303 | | |
| | | 304 | | /// <summary> |
| | | 305 | | /// Gets the callback to dispose enumerator. |
| | | 306 | | /// </summary> |
| | | 307 | | /// <value>The callback to dispose enumerator.</value> |
| | | 308 | | public EnumerationEndedDelegate Dispose { get; } |
| | | 309 | | } |
| | | 310 | | |
| | | 311 | | /// <summary> |
| | | 312 | | /// This delegate captures signature of <see cref="IAsyncEnumerator{T}.WaitForNextAsync"/>, and is used by <see cref= |
| | | 313 | | /// </summary> |
| | | 314 | | /// <returns>Potentially asynchronously returns value indicating whether there are more elements to be enumerated.</r |
| | | 315 | | public delegate Task<Boolean> WaitForNextDelegate(); |
| | | 316 | | |
| | | 317 | | /// <summary> |
| | | 318 | | /// This delegate captures signature of <see cref="IAsyncEnumerator{T}.TryGetNext"/>, and is used by <see cref="Wrapp |
| | | 319 | | /// </summary> |
| | | 320 | | /// <typeparam name="T">The type of items being enumerated.</typeparam> |
| | | 321 | | /// <param name="success">Whether this call was successful in retrieving next item.</param> |
| | | 322 | | /// <returns>The next item.</returns> |
| | | 323 | | public delegate T TryGetNextDelegate<T>( out Boolean success ); |
| | | 324 | | |
| | | 325 | | /// <summary> |
| | | 326 | | /// This type contains a set of delegates required to mimic <see cref="IAsyncEnumerator{T}"/>. |
| | | 327 | | /// It is used by <see cref="AsyncEnumerationFactory.CreateStatefulWrappingEnumerable"/> and <see cref="AsyncEnumerat |
| | | 328 | | /// The <see cref="AsyncEnumerationFactory.CreateWrappingStartInfo"/> can be used to create instances of this type wh |
| | | 329 | | /// </summary> |
| | | 330 | | /// <typeparam name="T">The type of items being enumerated.</typeparam> |
| | | 331 | | public struct WrappingEnumerationStartInfo<T> |
| | | 332 | | { |
| | | 333 | | /// <summary> |
| | | 334 | | /// Creates a new instance of <see cref="WrappingEnumerationStartInfo{T}"/>. |
| | | 335 | | /// </summary> |
| | | 336 | | /// <param name="waitForNext">The callback that will be used by <see cref="IAsyncEnumerator{T}.WaitForNextAsync"/> |
| | | 337 | | /// <param name="tryGetNext">The callback that will be used by <see cref="IAsyncEnumerator{T}.TryGetNext"/>.</para |
| | | 338 | | /// <param name="dispose">The optional callback that will be used by <see cref="IAsyncDisposable.DisposeAsync"/>.< |
| | | 339 | | /// <exception cref="ArgumentNullException">If either of <paramref name="waitForNext"/> or <paramref name="tryGetN |
| | | 340 | | public WrappingEnumerationStartInfo( |
| | | 341 | | WaitForNextDelegate waitForNext, |
| | | 342 | | TryGetNextDelegate<T> tryGetNext, |
| | | 343 | | EnumerationEndedDelegate dispose |
| | | 344 | | ) |
| | | 345 | | { |
| | | 346 | | this.WaitForNext = waitForNext; |
| | | 347 | | this.TryGetNext = tryGetNext; |
| | | 348 | | this.Dispose = dispose; |
| | | 349 | | } |
| | | 350 | | |
| | | 351 | | /// <summary> |
| | | 352 | | /// Gets the callback for <see cref="IAsyncEnumerator{T}.WaitForNextAsync"/> method. |
| | | 353 | | /// </summary> |
| | | 354 | | /// <value>The callback for <see cref="IAsyncEnumerator{T}.WaitForNextAsync"/> method.</value> |
| | | 355 | | /// <seealso cref="WaitForNextDelegate"/> |
| | | 356 | | public WaitForNextDelegate WaitForNext { get; } |
| | | 357 | | |
| | | 358 | | /// <summary> |
| | | 359 | | /// Gets the callback for <see cref="IAsyncEnumerator{T}.TryGetNext"/> method. |
| | | 360 | | /// </summary> |
| | | 361 | | /// <value>The callback for <see cref="IAsyncEnumerator{T}.TryGetNext"/> method.</value> |
| | | 362 | | /// <seealso cref="WaitForNextDelegate"/> |
| | | 363 | | public TryGetNextDelegate<T> TryGetNext { get; } |
| | | 364 | | |
| | | 365 | | /// <summary> |
| | | 366 | | /// Gets the callback for <see cref="IAsyncDisposable.DisposeAsync"/> method. |
| | | 367 | | /// </summary> |
| | | 368 | | /// <value>The callback for <see cref="IAsyncDisposable.DisposeAsync"/> method.</value> |
| | | 369 | | /// <seealso cref="EnumerationEndedDelegate"/> |
| | | 370 | | public EnumerationEndedDelegate Dispose { get; } |
| | | 371 | | } |
| | | 372 | | } |