internal void EnableExpirationTimer(bool enable)
{
if (enable)
{
if (_timerHandleRef == null)
{
DateTime utcNow = DateTime.UtcNow;
TimeSpan due = _tsPerBucket - (new TimeSpan(utcNow.Ticks % _tsPerBucket.Ticks));
Timer timer = new Timer(new TimerCallback(this.TimerCallback), null,
due.Ticks / TimeSpan.TicksPerMillisecond, _tsPerBucket.Ticks / TimeSpan.TicksPerMillisecond);
_timerHandleRef = new GCHandleRef <Timer>(timer);
Dbg.Trace("Cache", "Cache expiration timer created.");
}
}
else
{
GCHandleRef <Timer> timerHandleRef = _timerHandleRef;
if (timerHandleRef != null && Interlocked.CompareExchange(ref _timerHandleRef, null, timerHandleRef) == timerHandleRef)
{
timerHandleRef.Dispose();
Dbg.Trace("Cache", "Cache expiration timer disposed.");
while (_inFlush != 0)
{
Thread.Sleep(100);
}
}
}
}
internal void EnableExpirationTimer(bool enable)
{
if (enable)
{
if (_timerHandleRef == null)
{
DateTime utcNow = DateTime.UtcNow;
TimeSpan due = _tsPerBucket - (new TimeSpan(utcNow.Ticks % _tsPerBucket.Ticks));
Timer timer;
// Don't capture the current ExecutionContext and its AsyncLocals onto the timer causing them to live forever
bool restoreFlow = false;
try
{
if (!ExecutionContext.IsFlowSuppressed())
{
ExecutionContext.SuppressFlow();
restoreFlow = true;
}
timer = new Timer(new TimerCallback(this.TimerCallback), null,
due.Ticks / TimeSpan.TicksPerMillisecond, _tsPerBucket.Ticks / TimeSpan.TicksPerMillisecond);
}
finally
{
// Restore the current ExecutionContext
if (restoreFlow)
{
ExecutionContext.RestoreFlow();
}
}
_timerHandleRef = new GCHandleRef <Timer>(timer);
Dbg.Trace("Cache", "Cache expiration timer created.");
}
}
else
{
GCHandleRef <Timer> timerHandleRef = _timerHandleRef;
if (timerHandleRef != null && Interlocked.CompareExchange(ref _timerHandleRef, null, timerHandleRef) == timerHandleRef)
{
timerHandleRef.Dispose();
Dbg.Trace("Cache", "Cache expiration timer disposed.");
while (_inFlush != 0)
{
Thread.Sleep(100);
}
}
}
}
public void Dispose()
{
if (Interlocked.Exchange(ref _disposed, 1) == 0)
{
lock (_timerLock)
{
GCHandleRef <Timer> timerHandleRef = _timerHandleRef;
if (timerHandleRef != null && Interlocked.CompareExchange(ref _timerHandleRef, null, timerHandleRef) == timerHandleRef)
{
timerHandleRef.Dispose();
Dbg.Trace("MemoryCacheStats", "Stopped CacheMemoryTimers");
}
}
while (_inCacheManagerThread != 0)
{
Thread.Sleep(100);
}
_cacheMemoryMonitor?.Dispose();
// Don't need to call GC.SuppressFinalize(this) for sealed types without finalizers.
}
}