public CounterProvider(CounterFinder finder)
{
//
// Cache strategy
// key: performance counter category, value: Counter Monitor
// key: performance counter category + performance counter instance, value: list of performance counters
// Cache stores one counter monitor per performance counter category
// When performance counters are requested they are added to the monitor for their category and then cached under category + instance
// for quick retrieval and lifetime management
_cache = new MemoryCache(new MemoryCacheOptions()
{
ExpirationScanFrequency = CacheExpiration,
CompactOnMemoryPressure = false
});
_counterFinder = finder;
_concurrentCacheHelper = new ConcurrentCacheHelper(_cache);
_cacheEvicter = new Timer(TimerCallback, null, ScanFrequency, ScanFrequency);
}
public void Dispose()
{
//
// Evict the entire cache to trigger handling of disposable resources
_cache.Compact(100);
if (_cacheEvicter != null)
{
_cacheEvicter.Dispose();
_cacheEvicter = null;
}
if (_cache != null)
{
_cache.Dispose();
_cache = null;
}
if (_concurrentCacheHelper != null)
{
_concurrentCacheHelper.Dispose();
_concurrentCacheHelper = null;
}
}