public ICache GetOrCreateSubCache(string name) {
this._syncObject.EnterUpgradeableReadLock();
try {
MemCache result = null;
if (!_subCaches.TryGetValue(name, out result)) {
this._syncObject.EnterWriteLock();
try
{
if (!_subCaches.TryGetValue(name, out result))
{
result = new MemCache(this);
this._subCaches.Add(name,result);
TryStartTask();
}
}
finally
{
this._syncObject.ExitWriteLock();
}
}
return result;
} finally {
this._syncObject.ExitUpgradeableReadLock();
}
}
static void RemoveExpired(MemCache cache, DateTime now, DateTime expireTime, List<CacheItem> removed)
{
cache._items = RemoveExpiredItems(now, expireTime, cache._items, removed);
var newSubs = new SortedDictionary<string, MemCache>();
foreach (var pair in cache._subCaches) {
var sub = pair.Value;
RemoveExpired(sub,now,expireTime,removed);
if (sub._items.Count != 0 || sub._subCaches.Count != 0) {
newSubs.Add(pair.Key,sub);
}
}
cache._subCaches = newSubs;
}
private MemCache(MemCache parent) {
this.Parent = parent;
this._syncObject = parent._syncObject;
}
