/// <summary>
/// RenewPeriodic is used to periodically invoke Session.Renew on a session until a CancellationToken is cancelled.
/// This is meant to be used in a long running call to ensure a session stays valid until completed.
/// </summary>
/// <param name="initialTTL">The initital TTL to renew for</param>
/// <param name="id">The session ID to renew</param>
/// <param name="q">Customized write options</param>
/// <param name="ct">The CancellationToken used to stop the session from being renewed (e.g. when the long-running action completes)</param>
public Task RenewPeriodic(TimeSpan initialTTL, string id, WriteOptions q, CancellationToken ct)
{
return(Task.Factory.StartNew(async() =>
{
if (q == null)
{
throw new ArgumentNullException(nameof(q));
}
var waitDuration = (int)(initialTTL.TotalMilliseconds / 2);
var lastRenewTime = DateTime.Now;
Exception lastException = new SessionExpiredException(string.Format("Session expired: {0}", id));
try
{
while (!ct.IsCancellationRequested)
{
if (DateTime.Now.Subtract(lastRenewTime) > initialTTL)
{
throw lastException;
}
try
{
await Task.Delay(waitDuration, ct).ConfigureAwait(false);
}
catch (OperationCanceledException)
{
// Ignore OperationCanceledException because it means the wait cancelled in response to a CancellationToken being cancelled.
}
try
{
var res = await Renew(id, q).ConfigureAwait(false);
initialTTL = res.Response.TTL ?? TimeSpan.Zero;
waitDuration = (int)(initialTTL.TotalMilliseconds / 2);
lastRenewTime = DateTime.Now;
}
catch (SessionExpiredException)
{
throw;
}
catch (OperationCanceledException)
{
// Ignore OperationCanceledException/TaskCanceledException since it means the session no longer exists or the task is stopping.
}
catch (Exception ex)
{
waitDuration = 1000;
lastException = ex;
}
}
}
finally
{
if (ct.IsCancellationRequested)
{
await _client.Session.Destroy(id).ConfigureAwait(false);
}
}
}, CancellationToken.None, TaskCreationOptions.LongRunning, TaskScheduler.Default).Unwrap());
}
/// <summary>
/// RenewPeriodic is used to periodically invoke Session.Renew on a session until a CancellationToken is cancelled.
/// This is meant to be used in a long running call to ensure a session stays valid until completed.
/// </summary>
/// <param name="initialTTL">The initital TTL to renew for</param>
/// <param name="id">The session ID to renew</param>
/// <param name="q">Customized write options</param>
/// <param name="ct">The CancellationToken used to stop the session from being renewed (e.g. when the long-running action completes)</param>
public Task RenewPeriodic(TimeSpan initialTTL, string id, WriteOptions q, CancellationToken ct)
{
return(Task.Factory.StartNew(async() =>
{
if (q == null)
{
throw new ArgumentNullException(nameof(q));
}
var waitDuration = TimeSpan.FromMilliseconds(initialTTL.TotalMilliseconds / 2);
var sw = Stopwatch.StartNew();
var ttl = initialTTL;
Exception lastException = new SessionExpiredException(string.Format("Session expired: {0}", id));
try
{
while (!ct.IsCancellationRequested)
{
if (sw.Elapsed > ttl)
{
throw lastException;
}
try
{
await Task.Delay(waitDuration, ct).ConfigureAwait(false);
var res = await Renew(id, q).ConfigureAwait(false);
// Handle the server updating the TTL
ttl = res.Response.TTL ?? TimeSpan.Zero;
waitDuration = TimeSpan.FromMilliseconds(ttl.TotalMilliseconds / 2);
sw = Stopwatch.StartNew();
}
catch (SessionExpiredException)
{
throw;
}
catch (OperationCanceledException)
{
// Ignore OperationCanceledException/TaskCanceledException since it means the session no longer exists or the task is stopping.
}
catch (Exception ex)
{
waitDuration = TimeSpan.FromSeconds(1);
lastException = ex;
}
}
}
finally
{
if (ct.IsCancellationRequested)
{
await _client.Session.Destroy(id).ConfigureAwait(false);
}
}
}, CancellationToken.None, TaskCreationOptions.LongRunning, TaskScheduler.Default).Unwrap());
}
