using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace Mvc30WebRole1.Util
{
public class CacheUtility
{
private static Dictionary<string, object> MemCache = new Dictionary<string, object>();
private static Dictionary<string, object> MemCacheLocks = new Dictionary<string, object>();
private static List<string> keyNames = new List<string>() { "AllLocations" };
static CacheUtility()
{
foreach (string item in keyNames)
{
MemCache.Add(item, null);
MemCacheLocks.Add(item, new object());
}
}
public static T GetFromCacheOrAdd<T>(string cacheKey, Func<object> populateMethod)
{
if (MemCache[cacheKey] == null)
{
lock (MemCacheLocks[cacheKey])
{
if (MemCache[cacheKey] == null)
{
MemCache[cacheKey] = populateMethod.Invoke();
}
}
}
object cachedItem = MemCache[cacheKey];
if (cachedItem == null)
throw new Exception("Unable to retrieve item from cache with cacheKey '" + cacheKey + "'");
return (T)cachedItem;
}
public static void RemoveCacheItem(string cacheKey)
{
MemCache[cacheKey] = null;
}
public static void RemoveAllFromCache()
{
foreach (string item in keyNames)
{
RemoveCacheItem(item);
}
}
}
}
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