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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
using System.Net.Http;
using System.Web;
using System.Web.Http.Hosting;
namespace System.Web.Http.WebHost
{
/// <summary>
/// Provides an implementation of <see cref="IHostBufferPolicySelector"/> suited for use
/// in an ASP.NET environment which provides direct support for input and output buffering.
/// </summary>
public class WebHostBufferPolicySelector : IHostBufferPolicySelector
{
/// <summary>
/// Determines whether the host should buffer the entity body when processing a request with content.
/// </summary>
/// <param name="hostContext">The host-specific context. In this case, it is an instance
/// of <see cref="HttpContextBase"/>.</param>
/// <returns><c>true</c> if buffering should be used; otherwise a streamed request should be used.</returns>
public virtual bool UseBufferedInputStream(object hostContext)
{
if (hostContext == null)
{
throw Error.ArgumentNull("hostContext");
}
return true;
}
/// <summary>
/// Determines whether the host should buffer the <see cref="HttpResponseMessage"/> entity body.
/// </summary>
/// <param name="response">The <see cref="HttpResponseMessage"/>response for which to determine
/// whether host output buffering should be used for the response entity body.</param>
/// <returns><c>true</c> if buffering should be used; otherwise a streamed response should be used.</returns>
public virtual bool UseBufferedOutputStream(HttpResponseMessage response)
{
if (response == null)
{
throw Error.ArgumentNull("response");
}
// Any HttpContent that knows its length is presumably already buffered internally.
HttpContent content = response.Content;
if (content != null)
{
long? contentLength = content.Headers.ContentLength;
if (contentLength.HasValue && contentLength.Value >= 0)
{
return false;
}
// Content length is null or -1 (meaning not known).
// Buffer any HttpContent except StreamContent and PushStreamContent
return !(content is StreamContent || content is PushStreamContent);
}
return false;
}
}
}
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