checkNotNull(function);
    return new Future<O>() {

      @Override
      public boolean cancel(boolean mayInterruptIfRunning) {
        return input.cancel(mayInterruptIfRunning);
      }

      @Override
      public boolean isCancelled() {
        return input.isCancelled();
      }

      @Override
      public boolean isDone() {
        return input.isDone();
      }

			if err != nil {
				return updatedAt, err
			}

			if len(policyBuf) > maxSVCSessionPolicySize {
				return updatedAt, errSessionPolicyTooLarge
			}

			// Overwrite session policy claims.
			m.Set(policy.SessionPolicyName, base64.StdEncoding.EncodeToString(policyBuf))
			m.Set(iamPolicyClaimNameSA(), embeddedPolicyType)
		}
	}

						return res, osErrToFileErr(err)
					}
				}
			}
		}
	}

	// Set skipParent to skip mkdirAll() calls for deeply nested objects
	// - if its an overwrite
	// - if its a versioned object
	//
	// This can potentiall reduce syscalls by strings.Split(path, "/")
	// times relative to the object name.
	skipParent := dstVolumeDir
	if len(dstBuf) > 0 {

//
// If the number of dimensions is unknown, `num_dims` must be set to
// -1 and `dims` can be null. If a dimension is unknown, the
// corresponding entry in the `dims` array must be -1.
//
// This does not overwrite the existing shape associated with `output`,
// but merges the input shape with the existing shape.  For example,
// setting a shape of [-1, 2] with an existing shape [2, -1] would set

    checkNotNull(function);
    return new Future<O>() {

      @Override
      public boolean cancel(boolean mayInterruptIfRunning) {
        return input.cancel(mayInterruptIfRunning);
      }

      @Override
      public boolean isCancelled() {
        return input.isCancelled();
      }

      @Override
      public boolean isDone() {
        return input.isDone();
      }

		{
			srcVol:      "src-vol",
			destVol:     "dest-vol",
			srcPath:     "path/",
			destPath:    "new-path/",
			expectedErr: nil,
		},
		// TestXLStorage case - 3.
		// TestXLStorage to overwrite destination file.
		{
			srcVol:      "src-vol",
			destVol:     "dest-vol",
			srcPath:     "file2",
			destPath:    "file-one",
			expectedErr: nil,
		},
		// TestXLStorage case - 4.

    }

    //
    // Fesen Client
    //

    @Override
    public ThreadPool threadPool() {
        return client.threadPool();
    }

    @Override
    public AdminClient admin() {
        return client.admin();
    }

    @Override
    public ActionFuture<IndexResponse> index(final IndexRequest request) {
        return client.index(request);

  @Override
  public ImmutableSet<Entry<K, V>> entrySet() {
    return super.entrySet();
  }

  @Override
  ImmutableSet<Entry<K, V>> createEntrySet() {
    class EntrySet extends ImmutableMapEntrySet<K, V> {
      @Override
      public UnmodifiableIterator<Entry<K, V>> iterator() {
        return asList().iterator();
      }

      @Override
      public Spliterator<Entry<K, V>> spliterator() {

        }

        @Override
        public Activation transformActivation(Activation target) {
            stk.push(new ActivationFrame("activation", Optional.of(target)));
            try {
                return super.transformActivation(target);
            } finally {
                stk.pop();
            }
        }

        @Override

        return this.sessions.size();
    }


    @Override
    public int getInflightRequests () {
        return this.response_map.size();
    }


    @Override
    public boolean isDisconnected () {
        Socket s = this.socket;
        return super.isDisconnected() || s == null || s.isClosed();
    }


    @Override
    public boolean isFailed () {
        Socket s = this.socket;