code: public ServiceFuture<List<VaultUsageInner>> listByVaultsAsync(String resourceGroupName, String vaultName, final ServiceCallback<List<VaultUsageInner>> serviceCallback) {
          return ServiceFuture.fromResponse(listByVaultsWithServiceResponseAsync(resourceGroupName, vaultName), serviceCallback);
      }
docs: Fetches the usages of the vault.
  
  @param resourceGroupName The name of the resource group where the recovery services vault is present.
  @param vaultName The name of the recovery services vault.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object