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HttpRequestMessageExtensions.cs
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HttpRequestMessageExtensions.cs
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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.
using Microsoft.Extensions.Http;
using System;
using System.Net.Http;
namespace Polly
{
/// <summary>
/// Extension methods for <see cref="HttpRequestMessage"/> Polly integration.
/// </summary>
public static class HttpRequestMessageExtensions
{
internal static readonly string PolicyExecutionContextKey = "PolicyExecutionContext";
/// <summary>
/// Gets the <see cref="Context"/> associated with the provided <see cref="HttpRequestMessage"/>.
/// </summary>
/// <param name="request">The <see cref="HttpRequestMessage"/>.</param>
/// <returns>The <see cref="Context"/> if set, otherwise <c>null</c>.</returns>
/// <remarks>
/// The <see cref="PolicyHttpMessageHandler"/> will attach a context to the <see cref="HttpResponseMessage"/> prior
/// to executing a <see cref="Policy"/>, if one does not already exist. The <see cref="Context"/> will be provided
/// to the policy for use inside the <see cref="Policy"/> and in other message handlers.
/// </remarks>
public static Context GetPolicyExecutionContext(this HttpRequestMessage request)
{
if (request == null)
{
throw new ArgumentNullException(nameof(request));
}
request.Properties.TryGetValue(PolicyExecutionContextKey, out var context);
return context as Context;
}
/// <summary>
/// Sets the <see cref="Context"/> associated with the provided <see cref="HttpRequestMessage"/>.
/// </summary>
/// <param name="request">The <see cref="HttpRequestMessage"/>.</param>
/// <param name="context">The <see cref="Context"/>, may be <c>null</c>.</param>
/// <remarks>
/// The <see cref="PolicyHttpMessageHandler"/> will attach a context to the <see cref="HttpResponseMessage"/> prior
/// to executing a <see cref="Policy"/>, if one does not already exist. The <see cref="Context"/> will be provided
/// to the policy for use inside the <see cref="Policy"/> and in other message handlers.
/// </remarks>
public static void SetPolicyExecutionContext(this HttpRequestMessage request, Context context)
{
if (request == null)
{
throw new ArgumentNullException(nameof(request));
}
request.Properties[PolicyExecutionContextKey] = context;
}
}
}