Dynamic Application Configuration Solution

//------------------------------------------------------------------------------
// <auto-generated>
//     This code was generated by a tool.
//     Runtime Version:2.0.50727.1378
//
//     Changes to this file may cause incorrect behavior and will be lost if
//     the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------

using System;
using System.IO;
using System.Web;
using System.Web.Caching;
using System.Xml.Serialization;
using System.Diagnostics;
using System.Configuration;

namespace Configuration
{
    public static class SampleConfigurationManager
    {
        private const string STR_CONFIG_FILE_NAME = @"C:\Projects\DynamicConfiguration\ConfigBuildProvider\Test\Sample.xml";
        private const string STR_CACHE_KEY = "SampleCacheKey";
        private const string STR_CACHE_BACKUP_KEY = "SampleCacheBackupKey";
        private static readonly XmlSerializer xs = new XmlSerializer(typeof(Sample));
        private static string ConfigFileName
        {
            get
            {
                string fileName = ConfigurationManager.AppSettings["SampleConfigurationFile"];
                if (!String.IsNullOrEmpty(fileName))
                    return fileName;

                return STR_CONFIG_FILE_NAME;
            }
        }
        private static Cache cache
        {
            get
            {
                if (HttpContext.Current == null)
                    return HttpRuntime.Cache;

                return HttpContext.Current.Cache;
            }
        }
        private static void Save(Sample data, bool refresh)
        {
            if (data == null)
                return;

            using (FileStream fs = File.OpenWrite(ConfigFileName))
            {
                xs.Serialize(fs, data);
            }
            if (refresh)
            {
                Sample dummy = Data;
            }
        }
        private static void SetCache(Sample data, CacheDependency fileDependancy)
        {
            cache.Add(STR_CACHE_BACKUP_KEY, data, null,
                                    Cache.NoAbsoluteExpiration, new TimeSpan(24, 0, 0),
                                    CacheItemPriority.High, null);
            cache.Add(STR_CACHE_KEY, data, fileDependancy,
                Cache.NoAbsoluteExpiration, new TimeSpan(24, 0, 0),
                CacheItemPriority.High, null);
        }
        /// <summary>
        /// Gets or sets the configuration data.
        /// </summary>
        /// <value>The data.</value>
        public static Sample Data
        {
            get
            {
                Sample data = (Sample)cache[STR_CACHE_KEY];
                if (data == null)
                {
                    string path = null;
                    try
                    {
                        using (FileStream fs = File.OpenRead(ConfigFileName))
                        {
                            // Get full path for use as dependancy
                            path = fs.Name;
                            data = (Sample)xs.Deserialize(fs);
                        }
                    }
                    catch
                    {
                        Trace.WriteLine(String.Concat("Error reading configuration file ", ConfigFileName));
                    }
                    if (data == null)
                    {
                        data = (Sample)cache[STR_CACHE_BACKUP_KEY];
                        if (data == null)
                            return null;
                    }
                    SetCache(data, new CacheDependency(path));
                }
                return data;
            }
            set
            {
                if (File.Exists(ConfigFileName))
                    SetCache(value, new CacheDependency(ConfigFileName));
                else
                    SetCache(value, null);
            }
        }
        /// <summary>
        /// Saves this configuration instance.
        /// </summary>
        public static void Save()
        {
            Save(Data, false);
        }
        /// <summary>
        /// Saves the specified configuration data.
        /// </summary>
        /// <param name="data">The data.</param>
        public static void Save(Sample data)
        {
            Save(data, true);
        }
    }
}