async Task GrabLeaseOrWait(BlobLeaseWrapper leaseWrapper, CancellationToken token)
{
// Try to acquire the blob lease, otherwise wait for some time before we can try again.
var leaseId = await TryAcquireLeaseOrWait(leaseWrapper, token);
if (string.IsNullOrEmpty(leaseId))
{
return;
}
// Create a new linked cancellation token source, so if either the
// original token is canceled or the lease cannot be renewed,
// then the leader task can be canceled.
using (var cts =
CancellationTokenSource.CreateLinkedTokenSource(new[] { token })) {
// Run the leader task.
var leaderTask = _leaderTask.Invoke(cts.Token, _blob);
// Keeps renewing the lease in regular intervals.
// If the lease cannot be renewed, then the task completes.
var renew = KeepRenewingLease(leaseWrapper, leaseId, cts.Token);
// When any task completes (either the leader task or when it could
// not renew the lease) then cancel the other task.
await CancelAllWhenAnyCompletes(leaderTask, renew, cts);
}
}
