public async Task ReleaseAsync()
{
if (leaseClient != null)
{
await leaseClient.ReleaseAsync();
leaseClient = null;
}
}
LeaseImpl(ClientConnectionManager connectionManager)
{
this.connectionManager = connectionManager;
managedChannel = connectionManager.NewChannel();
leaseClient = new LeaseClient(managedChannel.channel);
// this.stub = connectionManager.NewStub<LeaseFutureStub>(null);
// this.leaseStub = connectionManager.NewStub<LeaseStub>(null);
// this.keepAlives = new ConcurrentDictionary<string, impl.KeepAlive>();
//this.scheduledExecutorService = MoreExecutors.listeningDecorator(Executors.newScheduledThreadPool(2));
}
public EtcdClient(params Uri[] etcdUrls)
{
this.channel = new Channel(etcdUrls[0].Host, etcdUrls[0].Port, ChannelCredentials.Insecure);
this.kvClient = new KV.KVClient(channel);
this.watchClient = new WatchClient(this.channel);
this.leaseClient = new LeaseClient(this.channel);
var asyncDuplexStreamingCall = leaseClient.LeaseKeepAlive();
this.leaseTTLRefresher = new EtcdLeaseTTLRefresher(asyncDuplexStreamingCall);
}
public async Task <bool> AcquireAsync()
{
var acquisitionStarted = DateTimeOffset.UtcNow;
do
{
attempts++;
var blobClient = containerClient.GetBlobClient(lockIdentifier);
leaseClient = blobClient.GetLeaseClient();
try
{
await leaseClient.AcquireAsync(lockDuration);
return(true);
}
catch (StorageRequestFailedException ex) when(ex.ErrorCode == "BlobNotFound")
{
var contentBytes = Encoding.UTF8.GetBytes(lockIdentifier);
var contentStream = new MemoryStream(contentBytes);
await blobClient.UploadAsync(contentStream);
}
catch (StorageRequestFailedException ex) when(ex.ErrorCode == "LeaseAlreadyPresent")
{
// Simple backoff logic.
var tryImmediatelyOrNot = random.Next(0, 3);
var maxBackOffDuration = attempts * (int)backoffInterval.TotalMilliseconds;
var randomBackOff = random.Next(0, maxBackOffDuration);
int delay = tryImmediatelyOrNot * randomBackOff;
await Task.Delay(delay);
}
catch (Exception ex)
{
throw ex;
}
} while (attempts < maxRetries || DateTimeOffset.UtcNow > acquisitionStarted + acquisitionTimeout);
return(false);
}
