locationcache.cs

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using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Caching;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;

using AspNet.StarterKits.Classifieds.BusinessLogicLayer;

namespace AspNet.StarterKits.Classifieds.Web
{
	public class CachedLocation
	{
		private int _id;
		private string _name;

		public int Id { get { return _id; } }
		public string Name { get { return _name; } }

		public CachedLocation(int id, string name)
		{
			this._id = id;
			this._name = name;
		}
	}

	public sealed class LocationCache
	{
		internal const string AllLocationsKey = "LocationCache_AllLocationsKey";

		private LocationCache()
		{
		}

		public static void ClearAll(HttpContext context)
		{
			context.Cache.Remove(AllLocationsKey);
		}

		public static List<CachedLocation> GetAllLocations()
		{
			return GetAllCategories(HttpContext.Current);
		}

		public static List<CachedLocation> GetAllCategories(HttpContext context)
		{
			if (context == null)
				return null;

			DateTime expiration = DateTime.Now.AddDays(1);
			List<CachedLocation> allLocations = context.Cache[AllLocationsKey] as List<CachedLocation>;
			if (allLocations == null)
			{
				allLocations = FetchAllLocations();
				context.Cache.Add(AllLocationsKey, allLocations, null, expiration, TimeSpan.Zero, System.Web.Caching.CacheItemPriority.High, null);
			}
			return allLocations;
		}

		private static List<CachedLocation> FetchAllLocations()
		{
			List<CachedLocation> list = new List<CachedLocation>();
			LocationsDataComponent.LocationsDataTable locationsResult = LocationsDB.GetAllLocations();
			foreach (LocationsDataComponent.LocationsRow location in locationsResult)
			{
				list.Add(new CachedLocation(location.Id, location.Name));
			}
			return list;
		}
	}
}