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Autofac / src / Source / Autofac.Integration.Mvc / PreApplicationStartCode.cs

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// This software is part of the Autofac IoC container
// Copyright © 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.ComponentModel;
using Microsoft.Web.Infrastructure.DynamicModuleHelper;

namespace Autofac.Integration.Mvc
{
    /// <summary>
    /// Container class for the ASP.NET application startup method.
    /// </summary>
    [EditorBrowsable(EditorBrowsableState.Never)]
    public static class PreApplicationStartCode
    {
        private static bool _startWasCalled;

        /// <summary>
        /// Performs ASP.NET application startup logic early in the pipeline.
        /// </summary>
        public static void Start()
        {
            // Guard against multiple calls. All Start calls are made on the same thread, so no lock needed here.
            if (_startWasCalled) return;

            _startWasCalled = true;
            DynamicModuleUtility.RegisterModule(typeof(RequestLifetimeHttpModule));
        }
    }
}