public CacheManager(string className, AllItemsEnumerator allItemsEnumerator, ItemIdentifier itemIdentifier, CacheDurability durability)
{
isAllItemCache = true;
this.className = className;
this.allItemsEnumerator = allItemsEnumerator;
this.itemIdentifier = itemIdentifier;
this.durability = durability;
TimeSpan duration = TimeSpan.Parse(ConfigurationManager.AppSettings[Enum.GetName(typeof(CacheDurability), durability)]);
List <T> item = allItemsEnumerator();
if (durability != CacheDurability.Indefinite)
{
cache.Insert(className, item, null, DateTime.UtcNow.Add(duration), Cache.NoSlidingExpiration);
}
else
{
cache.Insert(className, item, null, Cache.NoAbsoluteExpiration, duration,
delegate(string key, CacheItemUpdateReason reason, out object cachedItem, out CacheDependency dependancy, out DateTime absoluteTime, out TimeSpan newDuration)
{
cachedItem = cache[key];
dependancy = null;
absoluteTime = Cache.NoAbsoluteExpiration;
newDuration = duration;
Log(className, CacheLogType.AllItemCacheRefreshed, duration.ToString());
});
}
Log(className, CacheLogType.AllItemCacheStarted, durability.ToString());
}
public CacheManager(string className, ItemLocator itemLocator, ItemIdentifier itemIdentifier, CacheDurability durability)
{
this.className = className;
this.itemLocator = itemLocator;
this.itemIdentifier = itemIdentifier;
this.durability = durability;
Log(className, CacheLogType.EmptyCacheStarted, durability.ToString());
}
public T GetItem(string id)
{
if (!isAllItemCache)
{
T item = (T)cache[ItemCacheId(id)];
if (item != null)
{
Log(className, CacheLogType.SingleItemRead, id);
return(item);
}
item = itemLocator(id);
if (item == null)
{
throw new Exception(string.Format("Item not found: The requested item (id={0}) is not part of this lookup", id));
}
string cacheId = itemIdentifier(item);
if (id != cacheId)
{
throw new ArgumentException(string.Format("The fetched item can not be evaluated to yield the required id ({0})", id), "identifier");
}
TimeSpan duration = TimeSpan.Parse(ConfigurationManager.AppSettings[Enum.GetName(typeof(CacheDurability), durability)]);
Log(className, CacheLogType.SingleItemCached, id);
if (durability != CacheDurability.Indefinite)
{
cache.Insert(ItemCacheId(id), item, null, DateTime.UtcNow.Add(duration), Cache.NoSlidingExpiration);
}
else
{
cache.Insert(ItemCacheId(id), item, null, Cache.NoAbsoluteExpiration, duration,
delegate(string key, CacheItemUpdateReason reason, out object cachedItem, out CacheDependency dependancy, out DateTime absoluteTime, out TimeSpan newDuration)
{
Log(className, CacheLogType.SingleItemCacheRefreshed, id);
cachedItem = cache[key];
dependancy = null;
absoluteTime = Cache.NoAbsoluteExpiration;
newDuration = duration;
});
}
return(item);
}
else
{
try
{
List <T> items = (List <T>)cache[className];
if (items != null)
{
Log(className, CacheLogType.SingleItemRead, id);
}
else
{
Log(className, CacheLogType.AllItemCacheRefreshed, durability.ToString());
Log(className, CacheLogType.SingleItemRead, durability.ToString());
TimeSpan duration = TimeSpan.Parse(ConfigurationManager.AppSettings[Enum.GetName(typeof(CacheDurability), durability)]);
items = allItemsEnumerator();
cache.Insert(className, items, null, DateTime.UtcNow.Add(duration), Cache.NoSlidingExpiration);
}
return((from t in (List <T>)cache[className] where id == itemIdentifier(t) select t).First());
}
catch
{
throw new Exception(string.Format("Item not found: The requested item (id={0}) is not part of this lookup", id));
}
}
}
