/// <summary>constructor</summary>
/// <param name="owner">parent of index</param>
/// <param name="lifespanManager"></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(FluidCache <T> owner, int capacity, LifespanManager <T> lifespanManager, GetKey <T, TKey> getKey, ItemLoader <TKey, T> loadItem)
{
Debug.Assert(owner != null, "owner argument required");
Debug.Assert(getKey != null, "GetKey delegate required");
this.owner = owner;
this.lifespanManager = lifespanManager;
index = new Dictionary <TKey, WeakReference>(capacity * 2);
_getKey = getKey;
this.loadItem = loadItem;
RebuildIndex();
}
/// <summary>constructor</summary>
/// <param name="owner">parent of index</param>
/// <param name="lifespanManager"></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>
/// <param name="keyEqualityComparer">The equality comparer to be used to compare the keys. Optional.</param>
public Index(
FluidCache <T> owner,
LifespanManager <T> lifespanManager,
GetKey <T, TKey> getKey,
ItemCreator <TKey, T> loadItem,
IEqualityComparer <TKey> keyEqualityComparer)
{
Debug.Assert(owner != null, "owner argument required");
Debug.Assert(getKey != null, "GetKey delegate required");
this.owner = owner;
this.lifespanManager = lifespanManager;
_getKey = getKey;
this.loadItem = loadItem;
this.keyEqualityComparer = keyEqualityComparer;
RebuildIndex();
}
public LifespanManager(FluidCache <T> owner, int capacity, TimeSpan minAge, TimeSpan maxAge, GetNow getNow)
{
this.owner = owner;
double maxMS = Math.Min(maxAge.TotalMilliseconds, (double)12 * 60 * 60 * 1000); // max = 12 hours
this.minAge = minAge;
this.getNow = getNow;
this.maxAge = TimeSpan.FromMilliseconds(maxMS);
validatyCheckInterval = TimeSpan.FromMilliseconds(maxMS / 240.0); // max timeslice = 3 min
bagItemLimit = Math.Max(capacity / 20, 1); // max 5% of capacity per bag
const int nrBags = 265; // based on 240 timeslices + 20 bags for ItemLimit + 5 bags empty buffer
bags = new OrderedAgeBagCollection <T>(nrBags);
Stats = new CacheStats(capacity, nrBags, bagItemLimit, minAge, this.maxAge, validatyCheckInterval);
OpenBag(0);
}
private const int nrBags = 265; // based on 240 timeslices + 20 bags for ItemLimit + 5 bags empty buffer
public LifespanManager(FluidCache <T> owner, TimeSpan minAge, TimeSpan maxAge, GetNow getNow)
{
this.owner = owner;
int maxMS = Math.Min((int)maxAge.TotalMilliseconds, 12 * 60 * 60 * 1000); // max = 12 hours
this.minAge = minAge;
this.getNow = getNow;
this.maxAge = TimeSpan.FromMilliseconds(maxMS);
validatyCheckInterval = TimeSpan.FromMilliseconds(maxMS / 240.0); // max timeslice = 3 min
bagItemLimit = this.owner.Capacity / 20; // max 5% of capacity per bag
bags = new AgeBag <T> [nrBags];
for (int loop = nrBags - 1; loop >= 0; --loop)
{
bags[loop] = new AgeBag <T>();
}
OpenCurrentBag(getNow(), 0);
}
public LifespanManager(FluidCache <T> owner, int capacity, TimeSpan minAge, TimeSpan maxAge, GetNow getNow)
{
this.owner = owner;
this.minAge = minAge;
this.getNow = getNow;
this.maxAge = TimeSpan.FromMilliseconds(Math.Min(maxAge.TotalMilliseconds, MaxMaxAge.TotalMilliseconds));
validatyCheckInterval =
TimeSpan.FromMilliseconds(Math.Min(maxAge.TotalMilliseconds, MaxInterval.TotalMilliseconds));
bagItemLimit = Math.Max(capacity / PreferedNrOfBags, 1);
int nrTimeSlices = (int)(MaxMaxAge.TotalMilliseconds / MaxInterval.TotalMilliseconds);
// NOTE: Based on 240 timeslices + 20 bags for ItemLimit + 5 bags empty buffer
int nrBags = nrTimeSlices + PreferedNrOfBags + EmptyBagsBuffer;
bags = new OrderedAgeBagCollection <T>(nrBags);
Stats = new CacheStats(capacity, nrBags, bagItemLimit, minAge, this.maxAge, validatyCheckInterval);
OpenBag(0);
}
