/// <summary>
/// Caches an object
/// </summary>
/// <param name="key">A unique key to cache the object under</param>
/// <param name="obj">The object to cache</param>
/// <param name="cachingOptions">Options on how to cache</param>
public static void Add(string key, object obj, ICachingOptions cachingOptions)
{
if (string.IsNullOrEmpty(key))
{
throw new ArgumentNullException("key");
}
if (obj == null)
{
throw new ArgumentNullException("obj");
}
if (cachingOptions == null)
{
throw new ArgumentNullException("cachingOptions");
}
CacheItemPolicy cacheItemPolicy = new CacheItemPolicy
{
Priority = CacheItemPriority.Default,
AbsoluteExpiration = DateTime.Now.AddMilliseconds(cachingOptions.Expiration.TotalMilliseconds)
};
if (cachingOptions.OnRemoved != null)
{
cacheItemPolicy.RemovedCallback += x => cachingOptions.OnRemoved(x.RemovedReason);
}
CacheLock.EnterWriteLock();
Cache.Set(key, obj, cacheItemPolicy);
CacheLock.ExitWriteLock();
}
/// <summary>
/// Retrieves an item from the cache and adds it if is not there
/// </summary>
/// <param name="key"></param>
/// <param name="selector"></param>
/// <param name="cachingOptions"></param>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
/// <exception cref="ArgumentNullException"></exception>
public static T GetOrAdd <T>(string key, Func <T> selector, ICachingOptions cachingOptions) where T : class
{
if (string.IsNullOrEmpty(key))
{
throw new ArgumentNullException("key");
}
if (selector == null)
{
throw new ArgumentNullException("selector");
}
if (cachingOptions == null)
{
throw new ArgumentNullException("cachingOptions");
}
T value = Get <T>(key);
if (value != null)
{
return(value);
}
CacheItemPolicy cacheItemPolicy = new CacheItemPolicy
{
Priority = CacheItemPriority.Default,
AbsoluteExpiration = DateTime.Now.AddMilliseconds(cachingOptions.Expiration.TotalMilliseconds)
};
if (cachingOptions.OnRemoved != null)
{
cacheItemPolicy.RemovedCallback += x => cachingOptions.OnRemoved(x.RemovedReason);
}
try
{
CacheLock.EnterWriteLock();
value = Cache[key] as T;
if (value != null)
{
return(value);
}
value = selector();
Cache.Set(key, value, cacheItemPolicy);
return(value);
}
finally
{
CacheLock.ExitWriteLock();
}
}
