internal long TrimInternal(int percent)
{
int count = Count;
int toTrim = 0;
// do we need to drop a percentage of entries?
if (percent > 0)
{
toTrim = (int)(((long)count * (long)percent) / 100L);
// would this leave us above MAX_COUNT?
int minTrim = count - MAX_COUNT;
if (toTrim < minTrim)
{
toTrim = minTrim;
}
// would this put us below MIN_COUNT?
int maxTrim = count - MIN_COUNT;
if (toTrim > maxTrim)
{
toTrim = maxTrim;
}
}
// do we need to trim?
if (toTrim <= 0 || _disposed == 1)
{
return(0);
}
int trimmed = 0; // total number of entries trimmed
int trimmedOrExpired = 0;
#if DBG
int beginTotalCount = count;
#endif
trimmedOrExpired = _expires.FlushExpiredItems(true);
if (trimmedOrExpired < toTrim)
{
trimmed = _usage.FlushUnderUsedItems(toTrim - trimmedOrExpired);
trimmedOrExpired += trimmed;
}
if (trimmed > 0 && _perfCounters != null)
{
// Update values for perfcounters
_perfCounters.IncrementBy(PerfCounterName.Trims, trimmed);
}
#if DBG
Dbg.Trace("MemoryCacheStore", "TrimInternal:"
+ " beginTotalCount=" + beginTotalCount
+ ", endTotalCount=" + count
+ ", percent=" + percent
+ ", trimmed=" + trimmed);
#endif
return(trimmedOrExpired);
}
