public void Dispose()
{
if (this.isDisposed)
{
return;
}
lock (this.disposeLock)
{
if (this.isDisposed)
{
return;
}
this.onDisposeCancelSource.SafeCancel();
lock (this.sync)
{
if (this.isDisposed)
{
return;
}
this.dbServices.SafeDispose();
this.dbServices = null;
this.onDisposeCancelSource.SafeDispose();
this.isDisposed = true;
}
}
}
public static ReserveResult FromValueResult(bool isSuccess, AcquiredLockServices acquiredLockServices)
{
if (acquiredLockServices == null)
{
throw new ArgumentNullException("acquiredLockServices");
}
return(new ReserveResult
{
IsSuccess = true,
ReservedServices = acquiredLockServices,
});
}
private Task SearchTaskBody(CancellationToken token)
{
return(Task.Factory.StartNew(() =>
{
using (var cts = CancellationTokenSource.CreateLinkedTokenSource(token, this.onDisposeCancelSource.Token))
{
//
var cancellationToken = cts.Token;
while (!cancellationToken.IsCancellationRequested)
{
try
{
CancellationToken leaseLostToken;
lock (this.sync)
{
// резервируем бд
if (this.dbServices?.LockObject.CheckAndUpdateLease(cancellationToken) == true)
{
// lease найдена и действует
}
else
{
// lease НЕ найдена или НЕ действует
this.dbServices?.Dispose();
this.dbServices = null;
// при this.dbServices != null - lease найдена и действует
this.dbServices = this.dbClusterService.AcquireLockAndServicesForAnyNodeOrDefault(dbClusterParameters, cancellationToken);
}
if (this.dbServices != null)
{
// lease найдена и действует
leaseLostToken = this.dbServices.LockObject.GetLoseLeaseToken();
}
}
// lease найдена и действует
if (leaseLostToken != null)
{
// ждём потери или отмены
WaitHandle.WaitAny(new WaitHandle[] { leaseLostToken.WaitHandle, cancellationToken.WaitHandle });
// при потере может стоит производить дополнительные действия?
continue;
}
if (cancellationToken.IsCancellationRequested)
{
return;
}
// lease не зарезервировалась
Task.Delay(this.settings.SearchDbTimeout, cancellationToken).Wait(cancellationToken);
}
catch (OperationCanceledException) when(cancellationToken.IsCancellationRequested)
{
// завершаем
return;
}
catch (Exception)
{
// ignore ??
}
}
}
}, TaskCreationOptions.LongRunning));
}
