code: public ServiceFuture<SasDefinitionBundle> getSasDefinitionAsync(String vaultBaseUrl, String storageAccountName, String sasDefinitionName, final ServiceCallback<SasDefinitionBundle> serviceCallback) {
          return ServiceFuture.fromResponse(getSasDefinitionWithServiceResponseAsync(vaultBaseUrl, storageAccountName, sasDefinitionName), serviceCallback);
      }
docs: Gets information about a SAS definition for the specified storage account. This operation requires the storage/getsas permission.
  
  @param vaultBaseUrl The vault name, for example https://myvault.vault.azure.net.
  @param storageAccountName The name of the storage account.
  @param sasDefinitionName The name of the SAS definition.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object