Jon Hanna
dcae8e220d
MoveToContentAsync is often called in states where it will immediately return true without any reading. In this case return AsyncUtils.True avoiding allocation or async state-machine. DoReadAsync is a very heavily hit method, and can often be fulfilled without creating another state machine, so do this. The remaining looping async case is the only use of ParsePostValueAsync, so inline it into the calling method, so there is one less task allocation. Return value of EatWhitespaceAsync is never used, returning void reduces the number of locals an hence the size of the state-machine. Do the same for EatWhitespace though the impact is less.
247 lines
14 KiB
C#
247 lines
14 KiB
C#
#region License
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// Copyright (c) 2007 James Newton-King
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//
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// Permission is hereby granted, free of charge, to any person
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// obtaining a copy of this software and associated documentation
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// files (the "Software"), to deal in the Software without
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// restriction, including without limitation the rights to use,
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// copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following
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// conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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// OTHER DEALINGS IN THE SOFTWARE.
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#endregion
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#if HAVE_ASYNC
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using System;
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using System.Collections.Generic;
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using System.Threading;
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using System.Threading.Tasks;
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using Newtonsoft.Json.Utilities;
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namespace Newtonsoft.Json
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{
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public abstract partial class JsonReader
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{
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/// <summary>
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/// Asynchronously reads the next JSON token from the source.
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/// </summary>
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/// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is <see cref="CancellationToken.None"/>.</param>
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/// <returns>A <see cref="Task{TResult}"/> that represents the asynchronous read. The <see cref="Task{TResult}.Result"/>
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/// property returns <c>true</c> if the next token was read successfully; <c>false</c> if there are no more tokens to read.</returns>
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/// <remarks>The default behaviour is to execute synchronously, returning an already-completed task. Derived
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/// classes can override this behaviour for true asychronousity.</remarks>
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public virtual Task<bool> ReadAsync(CancellationToken cancellationToken = default(CancellationToken))
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{
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return cancellationToken.CancelIfRequestedAsync<bool>() ?? Read().ToAsync();
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}
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/// <summary>
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/// Asynchronously skips the children of the current token.
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/// </summary>
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/// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is <see cref="CancellationToken.None"/>.</param>
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/// <returns>A <see cref="Task"/> that represents the asynchronous operation.</returns>
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/// <remarks>The default behaviour is to execute synchronously, returning an already-completed task. Derived
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/// classes can override this behaviour for true asychronousity.</remarks>
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public async Task SkipAsync(CancellationToken cancellationToken = default(CancellationToken))
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{
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if (TokenType == JsonToken.PropertyName)
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{
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await ReadAsync(cancellationToken).ConfigureAwait(false);
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}
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if (JsonTokenUtils.IsStartToken(TokenType))
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{
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int depth = Depth;
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while (await ReadAsync(cancellationToken).ConfigureAwait(false) && depth < Depth)
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{
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}
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}
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}
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internal async Task ReaderReadAndAssertAsync(CancellationToken cancellationToken)
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{
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if (!await ReadAsync(cancellationToken).ConfigureAwait(false))
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{
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throw CreateUnexpectedEndException();
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}
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}
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/// <summary>
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/// Asynchronously reads the next JSON token from the source as a <see cref="Nullable{T}"/> of <see cref="bool"/>.
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/// </summary>
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/// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is <see cref="CancellationToken.None"/>.</param>
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/// <returns>A <see cref="Task{TResult}"/> that represents the asynchronous read. The <see cref="Task{TResult}.Result"/>
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/// property returns the <see cref="Nullable{T}"/> of <see cref="bool"/>. This result will be <c>null</c> at the end of an array.</returns>
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/// <remarks>The default behaviour is to execute synchronously, returning an already-completed task. Derived
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/// classes can override this behaviour for true asychronousity.</remarks>
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public virtual Task<bool?> ReadAsBooleanAsync(CancellationToken cancellationToken = default(CancellationToken))
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{
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return cancellationToken.CancelIfRequestedAsync<bool?>() ?? Task.FromResult(ReadAsBoolean());
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}
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/// <summary>
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/// Asynchronously reads the next JSON token from the source as a <see cref="byte"/>[].
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/// </summary>
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/// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is <see cref="CancellationToken.None"/>.</param>
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/// <returns>A <see cref="Task{TResult}"/> that represents the asynchronous read. The <see cref="Task{TResult}.Result"/>
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/// property returns the <see cref="byte"/>[]. This result will be <c>null</c> at the end of an array.</returns>
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/// <remarks>The default behaviour is to execute synchronously, returning an already-completed task. Derived
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/// classes can override this behaviour for true asychronousity.</remarks>
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public virtual Task<byte[]> ReadAsBytesAsync(CancellationToken cancellationToken = default(CancellationToken))
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{
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return cancellationToken.CancelIfRequestedAsync<byte[]>() ?? Task.FromResult(ReadAsBytes());
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}
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internal async Task<byte[]> ReadArrayIntoByteArrayAsync(CancellationToken cancellationToken)
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{
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List<byte> buffer = new List<byte>();
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while (true)
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{
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if (!await ReadAsync(cancellationToken).ConfigureAwait(false))
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{
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SetToken(JsonToken.None);
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}
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if (ReadArrayElementIntoByteArrayReportDone(buffer))
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{
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byte[] d = buffer.ToArray();
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SetToken(JsonToken.Bytes, d, false);
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return d;
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}
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}
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}
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/// <summary>
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/// Asynchronously reads the next JSON token from the source as a <see cref="Nullable{T}"/> of <see cref="DateTime"/>.
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/// </summary>
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/// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is <see cref="CancellationToken.None"/>.</param>
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/// <returns>A <see cref="Task{TResult}"/> that represents the asynchronous read. The <see cref="Task{TResult}.Result"/>
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/// property returns the <see cref="Nullable{T}"/> of <see cref="DateTime"/>. This result will be <c>null</c> at the end of an array.</returns>
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/// <remarks>The default behaviour is to execute synchronously, returning an already-completed task. Derived
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/// classes can override this behaviour for true asychronousity.</remarks>
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public virtual Task<DateTime?> ReadAsDateTimeAsync(CancellationToken cancellationToken = default(CancellationToken))
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{
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return cancellationToken.CancelIfRequestedAsync<DateTime?>() ?? Task.FromResult(ReadAsDateTime());
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}
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/// <summary>
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/// Asynchronously reads the next JSON token from the source as a <see cref="Nullable{T}"/> of <see cref="DateTimeOffset"/>.
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/// </summary>
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/// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is <see cref="CancellationToken.None"/>.</param>
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/// <returns>A <see cref="Task{TResult}"/> that represents the asynchronous read. The <see cref="Task{TResult}.Result"/>
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/// property returns the <see cref="Nullable{T}"/> of <see cref="DateTimeOffset"/>. This result will be <c>null</c> at the end of an array.</returns>
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/// <remarks>The default behaviour is to execute synchronously, returning an already-completed task. Derived
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/// classes can override this behaviour for true asychronousity.</remarks>
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public virtual Task<DateTimeOffset?> ReadAsDateTimeOffsetAsync(CancellationToken cancellationToken = default(CancellationToken))
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{
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return cancellationToken.CancelIfRequestedAsync<DateTimeOffset?>() ?? Task.FromResult(ReadAsDateTimeOffset());
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}
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/// <summary>
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/// Asynchronously reads the next JSON token from the source as a <see cref="Nullable{T}"/> of <see cref="decimal"/>.
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/// </summary>
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/// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is <see cref="CancellationToken.None"/>.</param>
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/// <returns>A <see cref="Task{TResult}"/> that represents the asynchronous read. The <see cref="Task{TResult}.Result"/>
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/// property returns the <see cref="Nullable{T}"/> of <see cref="decimal"/>. This result will be <c>null</c> at the end of an array.</returns>
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/// <remarks>The default behaviour is to execute synchronously, returning an already-completed task. Derived
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/// classes can override this behaviour for true asychronousity.</remarks>
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public virtual Task<decimal?> ReadAsDecimalAsync(CancellationToken cancellationToken = default(CancellationToken))
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{
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return cancellationToken.CancelIfRequestedAsync<decimal?>() ?? Task.FromResult(ReadAsDecimal());
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}
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/// <summary>
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/// Asynchronously reads the next JSON token from the source as a <see cref="Nullable{T}"/> of <see cref="double"/>.
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/// </summary>
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/// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is <see cref="CancellationToken.None"/>.</param>
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/// <returns>A <see cref="Task{TResult}"/> that represents the asynchronous read. The <see cref="Task{TResult}.Result"/>
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/// property returns the <see cref="Nullable{T}"/> of <see cref="double"/>. This result will be <c>null</c> at the end of an array.</returns>
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/// <remarks>The default behaviour is to execute synchronously, returning an already-completed task. Derived
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/// classes can override this behaviour for true asychronousity.</remarks>
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public virtual Task<double?> ReadAsDoubleAsync(CancellationToken cancellationToken = default(CancellationToken))
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{
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return Task.FromResult(ReadAsDouble());
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}
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/// <summary>
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/// Asynchronously reads the next JSON token from the source as a <see cref="Nullable{T}"/> of <see cref="int"/>.
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/// </summary>
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/// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is <see cref="CancellationToken.None"/>.</param>
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/// <returns>A <see cref="Task{TResult}"/> that represents the asynchronous read. The <see cref="Task{TResult}.Result"/>
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/// property returns the <see cref="Nullable{T}"/> of <see cref="int"/>. This result will be <c>null</c> at the end of an array.</returns>
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/// <remarks>The default behaviour is to execute synchronously, returning an already-completed task. Derived
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/// classes can override this behaviour for true asychronousity.</remarks>
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public virtual Task<int?> ReadAsInt32Async(CancellationToken cancellationToken = default(CancellationToken))
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{
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return cancellationToken.CancelIfRequestedAsync<int?>() ?? Task.FromResult(ReadAsInt32());
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}
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/// <summary>
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/// Asynchronously reads the next JSON token from the source as a <see cref="string"/>.
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/// </summary>
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/// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is <see cref="CancellationToken.None"/>.</param>
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/// <returns>A <see cref="Task{TResult}"/> that represents the asynchronous read. The <see cref="Task{TResult}.Result"/>
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/// property returns the <see cref="string"/>. This result will be <c>null</c> at the end of an array.</returns>
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/// <remarks>The default behaviour is to execute synchronously, returning an already-completed task. Derived
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/// classes can override this behaviour for true asychronousity.</remarks>
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public virtual Task<string> ReadAsStringAsync(CancellationToken cancellationToken = default(CancellationToken))
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{
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return cancellationToken.CancelIfRequestedAsync<string>() ?? Task.FromResult(ReadAsString());
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}
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internal async Task<bool> ReadAndMoveToContentAsync(CancellationToken cancellationToken)
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{
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return await ReadAsync(cancellationToken).ConfigureAwait(false) && await MoveToContentAsync(cancellationToken).ConfigureAwait(false);
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}
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internal Task<bool> MoveToContentAsync(CancellationToken cancellationToken)
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{
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switch (TokenType)
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{
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case JsonToken.None:
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case JsonToken.Comment:
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return MoveToContentFromNonContentAsync(cancellationToken);
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default:
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return AsyncUtils.True;
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}
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}
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private async Task<bool> MoveToContentFromNonContentAsync(CancellationToken cancellationToken)
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{
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while (true)
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{
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if (!await ReadAsync(cancellationToken).ConfigureAwait(false))
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{
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return false;
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}
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switch (TokenType)
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{
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case JsonToken.None:
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case JsonToken.Comment:
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break;
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default:
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return true;
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}
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}
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}
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}
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}
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#endif
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