code: public Observable<ServiceResponse<DeletedKeyBundle>> getDeletedKeyWithServiceResponseAsync(String vaultBaseUrl, String keyName) {
          if (vaultBaseUrl == null) {
              throw new IllegalArgumentException("Parameter vaultBaseUrl is required and cannot be null.");
          }
          if (keyName == null) {
              throw new IllegalArgumentException("Parameter keyName is required and cannot be null.");
          }
          if (this.apiVersion() == null) {
              throw new IllegalArgumentException("Parameter this.apiVersion() is required and cannot be null.");
          }
          String parameterizedHost = Joiner.on(", ").join("{vaultBaseUrl}", vaultBaseUrl);
          return service.getDeletedKey(keyName, this.apiVersion(), this.acceptLanguage(), parameterizedHost, this.userAgent())
              .flatMap(new Func1<Response<ResponseBody>, Observable<ServiceResponse<DeletedKeyBundle>>>() {
                  @Override
                  public Observable<ServiceResponse<DeletedKeyBundle>> call(Response<ResponseBody> response) {
                      try {
                          ServiceResponse<DeletedKeyBundle> clientResponse = getDeletedKeyDelegate(response);
                          return Observable.just(clientResponse);
                      } catch (Throwable t) {
                          return Observable.error(t);
                      }
                  }
              });
      }
docs: Gets the public part of a deleted key.
  The Get Deleted Key operation is applicable for soft-delete enabled vaults. While the operation can be invoked on any vault, it will return an error if invoked on a non soft-delete enabled vault. This operation requires the keys/get permission.
  
  @param vaultBaseUrl The vault name, for example https://myvault.vault.azure.net.
  @param keyName The name of the key.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the DeletedKeyBundle object