Radarr/Autofac.Integration.Mvc/RequestLifetimeScopeProvide...

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// This software is part of the Autofac IoC container
// Copyright (c) 2011 Autofac Contributors
// http://autofac.org
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
using System;
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.Web;
namespace Autofac.Integration.Mvc
{
/// <summary>
/// Creates and disposes HTTP request based lifetime scopes.
/// </summary>
/// <remarks>
/// The provider is notified when a HTTP request ends by the <see cref="RequestLifetimeHttpModule"/>.
/// </remarks>
public class RequestLifetimeScopeProvider : ILifetimeScopeProvider
{
readonly ILifetimeScope _container;
/// <summary>
/// Tag used to identify registrations that are scoped to the HTTP request level.
/// </summary>
internal static readonly object HttpRequestTag = "AutofacWebRequest";
/// <summary>
/// Initializes a new instance of the <see cref="RequestLifetimeScopeProvider"/> class.
/// </summary>
/// <param name="container">The parent container, usually the application container.</param>
public RequestLifetimeScopeProvider(ILifetimeScope container)
{
if (container == null) throw new ArgumentNullException("container");
_container = container;
RequestLifetimeHttpModule.SetLifetimeScopeProvider(this);
}
/// <summary>
/// Gets the global, application-wide container.
/// </summary>
public ILifetimeScope ApplicationContainer
{
get { return _container; }
}
static ILifetimeScope LifetimeScope
{
get { return (ILifetimeScope)HttpContext.Current.Items[typeof(ILifetimeScope)]; }
set { HttpContext.Current.Items[typeof(ILifetimeScope)] = value; }
}
/// <summary>
/// Gets a nested lifetime scope that services can be resolved from.
/// </summary>
/// <param name="configurationAction">
/// A configuration action that will execute during lifetime scope creation.
/// </param>
/// <returns>A new or existing nested lifetime scope.</returns>
public ILifetimeScope GetLifetimeScope(Action<ContainerBuilder> configurationAction)
{
if (HttpContext.Current == null)
{
throw new InvalidOperationException(RequestLifetimeScopeProviderResources.HttpContextNotAvailable);
}
if (LifetimeScope == null)
{
if ((LifetimeScope = GetLifetimeScopeCore(configurationAction)) == null)
throw new InvalidOperationException(
string.Format(CultureInfo.CurrentCulture, RequestLifetimeScopeProviderResources.NullLifetimeScopeReturned, GetType().FullName));
}
return LifetimeScope;
}
/// <summary>
/// Ends the current HTTP request lifetime scope.
/// </summary>
public void EndLifetimeScope()
{
var lifetimeScope = LifetimeScope;
if (lifetimeScope != null)
lifetimeScope.Dispose();
}
/// <summary>
/// Gets a lifetime scope for the current HTTP request. This method can be overridden
/// to alter the way that the life time scope is constructed.
/// </summary>
/// <param name="configurationAction">
/// A configuration action that will execute during lifetime scope creation.
/// </param>
/// <returns>A new lifetime scope for the current HTTP request.</returns>
[SuppressMessage("Microsoft.Design", "CA1024:UsePropertiesWhereAppropriate")]
protected virtual ILifetimeScope GetLifetimeScopeCore(Action<ContainerBuilder> configurationAction)
{
return (configurationAction == null)
? ApplicationContainer.BeginLifetimeScope(HttpRequestTag)
: ApplicationContainer.BeginLifetimeScope(HttpRequestTag, configurationAction);
}
}
}