/// <summary>
/// Loads initial cache data
/// </summary>
/// <param name="initialLoader"></param>
/// <param name="cfg"></param>
private void LoadData(ICacheLoadProvider <TValue, TKey> initialLoader, Config <TValue, TKey> cfg)
{
if (initialLoader != null)
{
var intLoadTimeMaxSecs = cfg.LoadCacheMaxSeconds;
var numberOfSets = this.Config.NumberOfSets;
var itemsPerSet = this.Config.ItemsPerSet;
var arrSetIDXs = new int[this.Config.NumberOfSets];
arrSetIDXs[0] = -1;
int totalNumberLoaded = 0;
int totalNumberOfFullSets = 0;
DateTime start = DateTime.UtcNow;
while (initialLoader.GetNextKey(totalNumberLoaded, cfg,
(iSet) => {
return((iSet > -1 && iSet < numberOfSets) ? arrSetIDXs[iSet] : -1);
},
out TKey key))
{
int setNumber = FindSetNumber(key, out CacheItem <TValue, TKey>[] d);
if (setNumber > -1)
{
var idxMax = arrSetIDXs[setNumber];
if ((idxMax == 0 && setNumber > 0) ||
(idxMax == -1 && setNumber == 0) ||
(idxMax > 0 && (idxMax < itemsPerSet - 1))) //Check if this set is not full
{
TValue val = initialLoader.GetValue(key);
if (idxMax < 0)
{
idxMax = 0;
}
d[idxMax + this.SetNumberToSetAddress(setNumber)] = m_itemCreateHr(val, key);
arrSetIDXs[setNumber] = idxMax + 1;
totalNumberLoaded += 1;
if (idxMax >= (itemsPerSet - 1))
{
totalNumberOfFullSets += 1;
}
}
if ((totalNumberOfFullSets >= numberOfSets) ||
(intLoadTimeMaxSecs > 0 && (DateTime.UtcNow - start).TotalSeconds >= intLoadTimeMaxSecs))
{
break; //finish when all sets are full or the time elapsed is greater than a limit set by Config
}
}
}
}
}
/// <summary>
/// Constructs new cache object for a given <see cref="Config{TValue, TKey}"/> and initialLoader object.
/// </summary>
/// <param name="config">Cache configuration obect to be used for cache construction purposes.</param>
/// <param name="initialLoader">Initial loader implementation to be used for cache initialization</param>
public Cache(Config <TValue, TKey> config, ICacheLoadProvider <TValue, TKey> initialLoader) : base()
{
if (config == null)
{
throw new ArgumentException("config argument is reguired.");
}
this.Config = config;
if (config.Strategy == ReplacementStrategy.Custom && (config.ReplacementHandler != null))
{
m_replacementHandler = config.ReplacementHandler;
}
m_cachePlus = new CacheItem <TValue, TKey> [config.Size - 1];
m_cacheMinus = new CacheItem <TValue, TKey> [config.Size - 1];
if (config.CacheType != CachingAlgorithm.FullyAssociative)
{
m_SetAddressMask = (uint)(2 << config.SetSizeBits) - 1;
}
m_HashCalc = config.HashCalculator ?? DefaultCalcHashFunc;
m_itemCreateHr = config.CreateItemHandler ?? DefaultItemCreateHr;
m_LoadHandler = config.LoadHandler;
m_MaxScanThreads = (config.ThreadsMaxNumberOfScan > 0)? config.ThreadsMaxNumberOfScan : Config <TValue, TKey> .DefaultMaxNumberOfScanThreads;
LoadData(initialLoader, config);
}
