public async Task <TaskSeriesCommandResult> ExecuteAsync(CancellationToken cancellationToken)
{
// Exceptions wil propagate
bool executionSucceeded = await _lockManager.RenewAsync(_lock, cancellationToken);
TimeSpan delay = _speedupStrategy.GetNextDelay(executionSucceeded: true);
return(new TaskSeriesCommandResult(wait: Task.Delay(delay)));
}
public async Task <TaskSeriesCommandResult> ExecuteAsync(CancellationToken cancellationToken)
{
// Exceptions will propagate
bool renewalSucceeded = await _lockManager.RenewAsync(_lock, cancellationToken);
TimeSpan delay = _delayStrategy.GetNextDelay(renewalSucceeded);
return(new TaskSeriesCommandResult(Task.Delay(delay)));
}
private async Task AcquireOrRenewLeaseAsync()
{
if (_hostId == null)
{
_hostId = await _hostIdProvider.GetHostIdAsync(CancellationToken.None);
}
string lockName = GetBlobName(_hostId);
DateTime requestStart = DateTime.UtcNow;
if (HasLease)
{
try
{
await _lockManager.RenewAsync(LockHandle, CancellationToken.None);
_lastRenewal = DateTime.UtcNow;
_lastRenewalLatency = _lastRenewal - requestStart;
}
catch
{
// The lease was 'stolen'. Log details for debugging.
string lastRenewalFormatted = _lastRenewal.ToString("yyyy-MM-ddTHH:mm:ss.FFFZ", CultureInfo.InvariantCulture);
int millisecondsSinceLastSuccess = (int)(DateTime.UtcNow - _lastRenewal).TotalMilliseconds;
int lastRenewalMilliseconds = (int)_lastRenewalLatency.TotalMilliseconds;
ProcessLeaseError($"Another host has acquired the lease. The last successful renewal completed at {lastRenewalFormatted} ({millisecondsSinceLastSuccess} milliseconds ago) with a duration of {lastRenewalMilliseconds} milliseconds.");
}
}
else
{
string proposedLeaseId = _websiteInstanceId;
LockHandle = await _lockManager.TryLockAsync(null, lockName, _websiteInstanceId, proposedLeaseId, _leaseTimeout, CancellationToken.None);
if (LockHandle == null)
{
// We didn't have the lease and failed to acquire it. Common if somebody else already has it.
// This is normal and does not warrant any logging.
return;
}
_lastRenewal = DateTime.UtcNow;
_lastRenewalLatency = _lastRenewal - requestStart;
string message = $"Host lock lease acquired by instance ID '{_websiteInstanceId}'.";
_logger.LogInformation(message);
// We've successfully acquired the lease, change the timer to use our renewal interval
SetTimerInterval(_renewalInterval);
}
}