/// <summary>
/// Calculates the average grade of all the linked key results.
/// </summary>
/// <param name="objective">The objective to score</param>
/// <returns>AverageResult without the objective</returns>
private static async Task <AverageResult> CalculateAverage(WorkItem objective)
{
// Request all the work items at the same time.
IEnumerable <Task <KeyResult> > asyncOps = objective.Relations
.Where(r => r.Rel == "System.LinkTypes.Hierarchy-Forward")
.Select(r => GetWorkItemAsync <KeyResult>($"{r.Url}?$Expand=relations"));
var workitems = await Task.WhenAll(asyncOps);
int items = 0;
double total = 0;
foreach (var workitem in workitems)
{
// They may link items to the objective like tasks or user stories.
// This makes sure we only count the key results.
if (workitem.WorkItemType == KeyResult.WorkItemTypeValue)
{
items++;
total += workitem.Grade;
}
}
// Build and return a dynamic type
var result = new AverageResult
{
Items = items,
Total = total,
Average = total / items
};
return(result);
}
/// <summary>
/// Uses the hook to request the objective work item and find all the
/// linked key results to average.
/// </summary>
/// <param name="hook"></param>
/// <returns>AverageResult with the objective</returns>
public static async Task <AverageResult> ProcessObjective(Hook hook)
{
var objectiveRef = hook.Resource.Revision.Relations.First(r => r.Rel == "System.LinkTypes.Hierarchy-Reverse");
var requestUri = $"{objectiveRef.Url}?$Expand=relations";
var objective = await GetWorkItemAsync <WorkItem>(requestUri);
var average = await CalculateAverage(objective);
// Build and return a dynamic type
var result = new AverageResult
{
Objective = objective,
Items = average.Items,
Total = average.Total,
Average = average.Average
};
return(result);
}
