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Used closures instead of strings for the generic sorter. This removed the need for reflection.

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This commit is contained in:
Pradyumna Kaushik 2017-08-26 15:19:30 -04:00
parent 3c65bdf02e
commit 0869bea2d8
2 changed files with 10 additions and 30 deletions

30
def/sortingCriteria.go
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@ -1,29 +1,13 @@
package def
// Creating an enumeration of the resources in def.Task.
var taskResourceNames []string
type sortCriteria int
// Map a task's resource name to the sorting criteria (an integer corresponding to the enumeration).
func resourceToSortCriteria(resourceName string) sortCriteria {
// Appending resourceName to TaskResourceNames.
taskResourceNames = append(taskResourceNames, resourceName)
// Considering index of resource in TaskResourceNames to be the int mapping.
return sortCriteria(len(taskResourceNames) - 1)
}
func (sc sortCriteria) String() string {
return taskResourceNames[int(sc)]
}
// the sortBy function that takes a task reference and returns the resource to consider when sorting.
type sortBy func (task *Task) float64
// Possible Sorting Criteria
// Note: the value of the string passed as argument to resourceToSortCriteria() should be the same (case-sensitive)
// as the name of the of the corresponding resource in the struct.
// Each holds a closure that fetches the required resource from the
// given task reference.
var (
CPU = resourceToSortCriteria("CPU")
RAM = resourceToSortCriteria("RAM")
Watts = resourceToSortCriteria("Watts")
Instances = resourceToSortCriteria("Instances")
SortByCPU = func (task *Task) float64 {return task.CPU}
SortByRAM = func (task *Task) float64 {return task.RAM}
SortByWatts = func (task *Task) float64 {return task.Watts}
)