/// <summary>constructor</summary>
/// <param name="owner">parent of index</param>
/// <param name="getKey">delegate to get key from object</param>
/// <param name="loadItem">delegate to load object if it is not found in index</param>
public Index(LruCache <ItemType> owner, GetKeyFunc <KeyType, ItemType> getKey, GetValueFunc <KeyType, ItemType> loadItem)
{
Debug.Assert(owner != null, "owner argument required");
Debug.Assert(getKey != null, "GetKey delegate required");
_owner = owner;
_index = new Dictionary <KeyType, WeakReference>(_owner._capacity * 2);
_getKey = getKey;
_loadItem = loadItem;
RebuildIndex();
}
private const int _size = 265; // based on 240 timeslices + 20 bags for ItemLimit + 5 bags empty buffer
public LifespanMgr(LruCache <ItemType> owner, TimeSpan minAge, TimeSpan maxAge)
{
_owner = owner;
int maxMS = Math.Min((int)maxAge.TotalMilliseconds, 12 * 60 * 60 * 1000); // max = 12 hours
_minAge = minAge;
_maxAge = TimeSpan.FromMilliseconds(maxMS);
_timeSlice = TimeSpan.FromMilliseconds(maxMS / 240.0); // max timeslice = 3 min
_bagItemLimit = _owner._capacity / 20; // max 5% of capacity per bag
_bags = new AgeBag[_size];
for (int loop = _size - 1; loop >= 0; --loop)
{
_bags[loop] = new AgeBag();
}
OpenCurrentBag(DateTime.Now, 0);
}