code: public ServiceFuture<BackupEngineBaseResourceInner> getAsync(String vaultName, String resourceGroupName, String backupEngineName, final ServiceCallback<BackupEngineBaseResourceInner> serviceCallback) {
          return ServiceFuture.fromResponse(getWithServiceResponseAsync(vaultName, resourceGroupName, backupEngineName), serviceCallback);
      }
docs: Returns backup management server registered to Recovery Services Vault.
  
  @param vaultName The name of the recovery services vault.
  @param resourceGroupName The name of the resource group where the recovery services vault is present.
  @param backupEngineName Name of the backup management server.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object