/// <summary>
/// Creates a new LRU (Least-Recently Used) cache of GrainReferences.
/// </summary>
/// <param name="maxSize">Maximum number of entries to allow.</param>
/// <param name="maxAge">Maximum age of an entry.</param>
/// <param name="f"> Delegate for fetching the value associated with a given key</param>
/// <param name="c"> Delegate for casting IAddressable to TValue</param>
public GrainReferenceCache(int maxSize, TimeSpan maxAge, FetchValueDelegate f, CastDelegate c)
{
maximumCount = maxSize;
requiredFreshness = maxAge;
fetcher = f;
cache = new Dictionary <TKey, TimestampedValue>();
rwLock = new ReaderWriterLockSlim();
}
/// <summary>
/// Creates a new LRU cache.
/// </summary>
/// <param name="maxSize">Maximum number of entries to allow.</param>
/// <param name="maxAge">Maximum age of an entry.</param>
/// <param name="f"></param>
public LRU(int maxSize, TimeSpan maxAge, FetchValueDelegate f)
{
if (maxSize <= 0)
{
throw new ArgumentOutOfRangeException("maxSize", "LRU maxSize must be greater than 0");
}
MaximumSize = maxSize;
requiredFreshness = maxAge;
fetcher = f;
cache = new ConcurrentDictionary <TKey, TimestampedValue>();
}
/// <summary>
/// Creates a new LRU cache.
/// </summary>
/// <param name="maxSize">Maximum number of entries to allow.</param>
/// <param name="ttl">Time of live of an entry.</param>
/// <param name="maxAge">Maximum age of an entry.</param>
/// <param name="fetcher"></param>
public LruCache(int maxSize, TimeSpan ttl, TimeSpan maxAge, FetchValueDelegate fetcher = null)
{
if (maxSize <= 0)
{
throw new ArgumentOutOfRangeException(nameof(maxSize), "LRU maxSize must be greater than 0");
}
MaximumSize = maxSize;
_maxAge = maxAge;
_fetcher = fetcher;
_cache = new ConcurrentDictionary <TKey, TimestampedValue>();
}