Taylohtio/GeneralApi/GeneralApi.Core/Infrastructure/Web/AutoMapperConfigurationModule.cs

using System;
using System.Web;
using GeneralApi.Core.Infrastructure.IoC;
using Taloyhtio.GeneralApi.Core.Infrastructure.AutoMapper;

namespace Taloyhtio.GeneralApi.Core.Infrastructure.Web
{
    public class AutoMapperConfigurationModule : IHttpModule
    {
        private static bool configured;
        private static readonly object lockObject = new object();

        public void Init(HttpApplication context)
        {
            context.BeginRequest += context_BeginRequest;
        }

        public void Dispose() { }

        private static void context_BeginRequest(object sender, EventArgs e)
        {
            ensureConfigured();
        }

        private static void ensureConfigured()
        {
            // configuration is required only once per AppDomain
            if (!configured)
            {
                lock (lockObject)
                {
                    if (!configured)
                    {
                        AutoMapperConfiguration.Configure();
                        configured = true;
                    }
                }
            }
        }
    }
}