private static void cacheDependency(string key, HttpContext context, ICacheEntity item)
{
string dependencyKey = item.GetCacheItemKey();
CacheDependencyList dependencyList = context.Cache[dependencyKey] as CacheDependencyList;
if (dependencyList == null)
{
insert(context, dependencyKey, dependencyList = new CacheDependencyList());
}
if (!dependencyList.Contains(key))
{
dependencyList.Add(key);
}
string typeDependencyKey = item.GetType().Name;
CacheDependencyList typeDependencyList = context.Cache[typeDependencyKey] as CacheDependencyList;
if (typeDependencyList == null)
{
insert(context, typeDependencyKey, typeDependencyList = new CacheDependencyList());
}
if (!typeDependencyList.Contains(dependencyKey))
{
typeDependencyList.Add(dependencyKey);
}
}
private static void invalidateDependency(HttpContext context, string dependencyKey)
{
CacheDependencyList dependencyList = context.Cache[dependencyKey] as CacheDependencyList;
if (dependencyList == null)
{
return;
}
foreach (string dependency in dependencyList)
{
CacheDependencyList dependencyItems = context.Cache[dependency] as CacheDependencyList;
if (dependencyItems != null)
{
foreach (string dependencyItem in dependencyItems)
{
invalidateByKey(context, dependencyItem);
}
}
invalidateByKey(context, dependency);
}
invalidateByKey(context, dependencyKey);
}
public void Invalidate <T>() where T : ICacheEntity
{
HttpContext context = HttpContext.Current;
CacheDependencyList dependencyList = context.Cache[typeof(T).Name] as CacheDependencyList;
if (dependencyList != null)
{
foreach (string dependency in dependencyList)
{
invalidateDependency(context, dependency);
}
}
}
public T GetItems <T, K>(string key, CachePartition partition, Func <T> getUncachedItems, Func <K, IEnumerable <ICacheEntity> > getDependencies)
where T : IEnumerable <K>
{
HttpContext context = HttpContext.Current;
string fullKey = partition != null ? key + partition.ToString() : key;
T cacheItem = (T)context.Cache[fullKey];
if (cacheItem != null)
{
return(cacheItem);
}
T items = getUncachedItems();
if (items != null)
{
insert(context, fullKey, items);
// partitions
if (partition != null)
{
CacheDependencyList partitionList = context.Cache[key] as CacheDependencyList;
if (partitionList == null)
{
insert(context, key, partitionList = new CacheDependencyList());
}
string keyAndPartition = key + partition.ToString();
if (!partitionList.Contains(keyAndPartition))
{
partitionList.Add(keyAndPartition);
}
}
// dependencies
if (getDependencies != null)
{
if (items.Count() > 0)
{
foreach (K item in items)
{
// add dependencies for each item
foreach (ICacheEntity dependency in getDependencies(item))
{
cacheDependency(key, context, dependency);
}
}
}
else
{
// allow the caller to add dependencies for dependent objects even though no items were found
foreach (ICacheEntity dependency in getDependencies(default(K)))
{
cacheDependency(key, context, dependency);
}
}
}
}
return(items);
}
