/// <summary>Constructor</summary>
/// <param name="capacity">the normal item limit for cache (Count may exeed capacity due to minAge)</param>
/// <param name="minAge">the minimium time after an access before an item becomes eligible for removal, during this time
/// the item is protected and will not be removed from cache even if over capacity</param>
/// <param name="maxAge">the max time that an object will sit in the cache without being accessed, before being removed</param>
/// <param name="isValid">delegate used to determine if cache is out of date. Called before index access not more than once per 10 seconds</param>
public LruItemCache(int capacity, TimeSpan minAge, TimeSpan maxAge, IsValidFunc isValid)
{
if (capacity <= 0)
{
throw new ArgumentException("capacity MUST > 0");
}
_capacity = capacity;
_isValid = isValid;
_lifeSpan = new LifespanMgr(this, minAge, maxAge);
}
private CastedValidation(IsValidFunc wrappedValidation)
{
this.wrappedValidation = wrappedValidation;
}
