private async Task PrunePoolAsync(CancellationToken cancellationToken)
{
bool enteredPool = false;
try
{
// if it takes too long to enter the pool, then the pool is fully utilized
// and we don't want to mess with it.
enteredPool = await _poolQueue.WaitAsync(TimeSpan.FromMilliseconds(20), cancellationToken).ConfigureAwait(false);
if (!enteredPool)
{
return;
}
_connectionHolder.Prune();
}
finally
{
if (enteredPool)
{
try
{
_poolQueue.Release();
}
catch
{
// log this... it's a bug
}
}
}
}
// private methods
private void MaintainSize(CancellationToken cancellationToken)
{
try
{
while (!cancellationToken.IsCancellationRequested)
{
try
{
_connectionHolder.Prune(cancellationToken);
EnsureMinSize(cancellationToken);
}
catch
{
// ignore exceptions
}
ThreadHelper.Sleep(_settings.MaintenanceInterval, cancellationToken);
}
}
catch
{
// ignore exceptions
}
}
// private methods
private async Task MaintainSizeAsync(CancellationToken cancellationToken)
{
try
{
while (!cancellationToken.IsCancellationRequested)
{
try
{
_connectionHolder.Prune(cancellationToken);
await EnsureMinSizeAsync(cancellationToken).ConfigureAwait(false);
}
catch
{
// ignore exceptions
}
await Task.Delay(_settings.MaintenanceInterval, cancellationToken).ConfigureAwait(false);
}
}
catch
{
// ignore exceptions
}
}