code: public ServiceFuture<List<VirtualMachineSizeInner>> listAvailableSizesAsync(String resourceGroupName, String vmName, final ServiceCallback<List<VirtualMachineSizeInner>> serviceCallback) {
          return ServiceFuture.fromResponse(listAvailableSizesWithServiceResponseAsync(resourceGroupName, vmName), serviceCallback);
      }
docs: Lists all available virtual machine sizes to which the specified virtual machine can be resized.
  
  @param resourceGroupName The name of the resource group.
  @param vmName The name of the virtual machine.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object