Resolve "Requesting information from the Controller via NBI takes very long"

Description

Related Issue

#230 (closed)

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

controller/interfaces/device/device.go

@@ -55,10 +55,14 @@ type LoadedDevice struct {
 	convertFunc func(LoadedDevice) (Device, error)
 }
 
+// SetConverFunction allows to set the LoadedDevice's convert function. This
+// function should take a LoadedDevice and returns a Device.
 func (ld LoadedDevice) SetConvertFunction(cf func(LoadedDevice) (Device, error)) {
 	ld.convertFunc = cf
 }
 
+// ConvertToDevice calls the LoadedDevice's convert function and converts the
+// LoadedDevice into a Device
 func (ld LoadedDevice) ConvertToDevice() (Device, error) {
 	return ld.convertFunc(ld)
 }