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Introduce optimized dependency graph resolution algorithm (#5963)
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| // Copyright (c) .NET Foundation. All rights reserved. | ||
| // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information. | ||
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| #nullable disable | ||
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| using System; | ||
| using System.Text; | ||
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| namespace NuGet | ||
| { | ||
| /// <summary> | ||
| /// Provides a resource pool that enables reusing instances of <see cref="StringBuilder"/> instances. | ||
| /// </summary> | ||
| /// <remarks> | ||
| /// <para> | ||
| /// Renting and returning buffers with an <see cref="StringBuilderPool"/> can increase performance | ||
| /// in situations where <see cref="StringBuilder"/> instances are created and destroyed frequently, | ||
| /// resulting in significant memory pressure on the garbage collector. | ||
| /// </para> | ||
| /// <para> | ||
| /// This class is thread-safe. All members may be used by multiple threads concurrently. | ||
| /// </para> | ||
| /// </remarks> | ||
| internal class SharedStringBuilder | ||
| { | ||
| private const int MaxSize = 256; | ||
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| [ThreadStatic] | ||
| private static StringBuilder BuilderInstance = null; | ||
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| [ThreadStatic] | ||
| private static bool InUse = false; | ||
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| public static readonly SharedStringBuilder Instance = new SharedStringBuilder(); | ||
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| private SharedStringBuilder() | ||
| { | ||
| } | ||
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| /// <summary> | ||
| /// Retrieves a <see cref="StringBuilder"/> that is at least the requested length. | ||
| /// </summary> | ||
| /// <param name="minimumCapacity">The minimum capacity of the <see cref="StringBuilder"/> needed.</param> | ||
| /// <returns> | ||
| /// A <see cref="StringBuilder"/> that is at least <paramref name="minimumCapacity"/> in length. | ||
| /// </returns> | ||
| /// <remarks> | ||
| /// This buffer is loaned to the caller and should be returned to the same pool via | ||
| /// <see cref="ToStringAndReturn"/> so that it may be reused in subsequent usage of <see cref="Rent"/>. | ||
| /// It is not a fatal error to not return a rented string builder, but failure to do so may lead to | ||
| /// decreased application performance, as the pool may need to create a new instance to replace | ||
| /// the one lost. | ||
| /// </remarks> | ||
| public StringBuilder Rent(int minimumCapacity) | ||
| { | ||
| if (!InUse) | ||
| { | ||
| if (minimumCapacity <= MaxSize) | ||
| { | ||
| InUse = true; | ||
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| if (BuilderInstance == null) | ||
| { | ||
| BuilderInstance = new StringBuilder(MaxSize); | ||
| } | ||
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| return BuilderInstance; | ||
| } | ||
| } | ||
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| return new StringBuilder(minimumCapacity); | ||
| } | ||
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| /// <summary> | ||
| /// Returns to the pool an array that was previously obtained via <see cref="Rent"/> on the same | ||
| /// <see cref="StringBuilderPool"/> instance, returning the built string. | ||
| /// </summary> | ||
| /// <param name="builder"> | ||
| /// The <see cref="StringBuilder"/> previously obtained from <see cref="Rent"/> to return to the pool. | ||
| /// </param> | ||
| /// <remarks> | ||
| /// Once a <see cref="StringBuilder"/> has been returned to the pool, the caller gives up all ownership | ||
| /// of the instance and must not use it. The reference returned from a given call to <see cref="Rent"/> | ||
| /// must only be returned via <see cref="ToStringAndReturn"/> once. The default <see cref="StringBuilderPool"/> | ||
| /// may hold onto the returned instance in order to rent it again, or it may release the returned instance | ||
| /// if it's determined that the pool already has enough instances stored. | ||
| /// </remarks> | ||
| /// <returns>The string, built from <paramref name="builder"/>.</returns> | ||
| public string ToStringAndReturn(StringBuilder builder) | ||
| { | ||
| string result = builder.ToString(); | ||
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| if (ReferenceEquals(BuilderInstance, builder)) | ||
| { | ||
| InUse = false; | ||
| builder.Clear(); | ||
| } | ||
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| return result; | ||
| } | ||
| } | ||
| } |
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