/// <summary>
/// Creates a new instance of ConcurrentCacheMap using the default values
/// and a <see cref="CacheMap{TKey,TValue}"/> for the internal data structure.
/// </summary>
/// /// <param name="timeToLiveSeconds">The time-to-live value (seconds).</param>
/// <param name="maxEntries">The maximum number of entries until items gets replaced with LRU.</param>
/// <param name="refreshTimeout">If set to true, timeout will be reset in case of PutIfAbsent().</param>
public ConcurrentCacheMap(int timeToLiveSeconds, int maxEntries, bool refreshTimeout)
{
_segments = new CacheMap <TKey, ExpiringObject> [SegmentNr];
int maxEntriesPerSegment = maxEntries / SegmentNr;
for (int i = 0; i < SegmentNr; i++)
{
// set updateOnInsert to true, since it should behave as a regular map
_segments[i] = new CacheMap <TKey, ExpiringObject>(maxEntriesPerSegment, true);
}
_timeToLiveSeconds = timeToLiveSeconds;
_refreshTimeout = refreshTimeout;
}
/// <summary>
/// Fast expiration. Since the ExpiringObject is ordered, the for-loop can break
/// eaely if an object is not expired.
/// </summary>
/// <param name="segment">The segment.</param>
private void ExpireSegment(CacheMap <TKey, ExpiringObject> segment)
{
//.NET-specific: iterate over KeyValuePairs
foreach (var kvp in segment.ToList()) // iterate over copy
{
var expObj = kvp.Value;
if (expObj.IsExpired)
{
segment.Remove(kvp.Key); // remove from original
Logger.Debug("Removed in expire segment: {0}.", expObj.Value);
_removedCounter.IncrementAndGet();
}
else
{
break;
}
}
}
/// <summary>
/// Expires a key in a segment. If a key value pair is expired, it will get removed.
/// </summary>
/// <param name="segment">The segment.</param>
/// <param name="key">The key.</param>
/// <param name="value">The value.</param>
/// <returns>True, if expired. False, otherwise.</returns>
private bool Expire(CacheMap <TKey, ExpiringObject> segment, TKey key, ExpiringObject value)
{
if (value.IsExpired)
{
lock (segment)
{
var tmp = segment.Get(key);
if (tmp != null && tmp.Equals(value))
{
segment.Remove(key);
Logger.Debug("Removed in expire: {0}.", value.Value);
_removedCounter.IncrementAndGet();
}
}
return(true);
}
return(false);
}
