public bool IsExpired(CachedItem <TValue> item)
{
if (item.Invalidated)
{
return(true);
}
DateTime from;
switch (ExpirationPolicy)
{
case ExpirationPolicy.SinceFetchedTime:
from = item.FetchedOn;
break;
case ExpirationPolicy.SinceLastAccessedTime:
from = item.LastAccessedOn;
break;
default:
from = DateTime.Now;
break;
}
return(ExpirationPolicy != ExpirationPolicy.None && DateTime.Now.Subtract(from) > ExpirationDuration);
}
protected void NotifyItemRemoved(TKey key, CachedItem <TValue> val)
{
OnItemRemoved(key, val);
if (ItemRemoved != null)
{
ItemRemoved(key, val);
}
}
private CachedItem <TValue> AddItemInternal(TKey key, TValue val)
{
var item = new CachedItem <TValue> {
AccessedCount = 0,
LastAccessedOn = DateTime.Now,
FetchedOn = DateTime.Now,
Value = val,
Size = EstimateSize(val)
};
if (MaxCapacity - CurrentSize < item.Size)
{
MakeSpace(item.Size);
}
InternalStorage[key] = item;
CurrentSize += item.Size;
return(item);
}
protected virtual void OnItemRemoved(TKey key, CachedItem <TValue> val)
{
}
