Generic http cache with locking

Cache.cs

    using System;
    using System.Web;
    using System.Web.Caching;
    using Umbraco.Core.Logging;

    /// <summary>
    /// Generic cache class
    /// </summary>
    /// <typeparam name="T">The type of the object to be cached</typeparam>
    /// <remarks>
    /// if the "getFunction" returns null, nothing can be cached and the "getFunction" will 
    /// be called every time the object is needed
    /// original from http://tompi.github.io/2012/04/02/Generic-ASP.NET-Cache-pattern
    /// </remarks>
    /// <example>
    /// var myobj = mycache.Get(padLock, strCacheName, () =>
    ///     {
    ///         return GetObject() ?? new MyObject();
    ///     }, 60 * 5);
    /// </example>
    public class Cache<T> where T : class
    {
        public T Get(object lockObject, string key, Func<T> getFunction, int secondsToCache)
        {
            var result = HttpRuntime.Cache.Get(key);
            if (result == null)
            {
                lock (lockObject)
                {
                    result = HttpRuntime.Cache.Get(key);
                    if (result == null)
                    {
                        result = getFunction();
                        if (result == null) return null;
                        HttpRuntime.Cache.Insert(key, result, null, DateTime.UtcNow.AddSeconds(secondsToCache), Cache.NoSlidingExpiration);
                        // do some umbraco logging
                        LogHelper.Debug<Cache<T>>("Inserted object in cache: {0}", () => key);
                    }
                }
            }
            return (T)result;
        }
    }