/// <summary>
/// Executes a method and stores the result in cache using the given cache key. If the data already exists in cache, it returns the data
/// and doesn't execute the method. Thread safe, although the method parameterisn't guaranteed to be thread safe.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="cache"></param>
/// <param name="cacheKey">Each method has it's own isolated set of cache items,so cacheKeys won't overlap accross methods.</param>
/// <param name="method"></param>
/// <param name="expirationSeconds">Lifetime of cache items, in seconds</param>
/// <returns></returns>
public static T Data <T>(string cacheKey,
int expirationSeconds, System.Func <T> method)
{
if (!EnableCache)
{
return(method());
}
EnsureHttpRuntime();
var cache = HttpRuntime.Cache;
var hash = method.GetHashCode().ToString();
var data = (T)cache[hash + cacheKey];
if (data == null)
{
data = method();
if (expirationSeconds > 0 && data != null)
{
lock (sync)
{
cache.Insert(hash + cacheKey, data, null, DateTime.Now.AddSeconds
(expirationSeconds), Cache.NoSlidingExpiration);
}
}
}
return(data);
}
public override int GetHashCode()
{
int prime = 31;
int result = base.GetHashCode();
result = prime * result + _function.GetHashCode();
return(result);
}