public ServiceFuture<VirtualMachineScaleSetExtensionInner> getAsync(String resourceGroupName, String vmScaleSetName, String vmssExtensionName, String expand, final ServiceCallback<VirtualMachineScaleSetExtensionInner> serviceCallback) {
        return ServiceFuture.fromResponse(getWithServiceResponseAsync(resourceGroupName, vmScaleSetName, vmssExtensionName, expand), serviceCallback);
    }
public ServiceFuture < VirtualMachineScaleSetExtensionInner > getAsync ( String resourceGroupName , String vmScaleSetName , String vmssExtensionName , String expand , final ServiceCallback < VirtualMachineScaleSetExtensionInner > serviceCallback ) { return ServiceFuture . fromResponse ( getWithServiceResponseAsync ( resourceGroupName , vmScaleSetName , vmssExtensionName , expand ) , serviceCallback ) ; }
The operation to get the extension.

@param resourceGroupName The name of the resource group.
@param vmScaleSetName The name of the VM scale set containing the extension.
@param vmssExtensionName The name of the VM scale set extension.
@param expand The expand expression to apply on the operation.
@param serviceCallback the async ServiceCallback to handle successful and failed responses.
@throws IllegalArgumentException thrown if parameters fail the validation
@return the {@link ServiceFuture} object