private async Task <IEnumerable <Document> > ProcessUserDocuments(IEnumerable <UserDocument> userDocuments)
{
var workItems = CreateWorkItemsForProcessingOperations(userDocuments).ToList();
workItems.ForEach(item => userWorkItemsService.UpdateWorkItemForUser(User.GetUserId(), item));
var tasks = from source in userDocuments
join workItem in workItems
on source.Id equals workItem.Id
select ProcessUserDocument(source, workItem);
var results = await Task.WhenAll(tasks);
ProcessedDocuments = ProcessedDocuments.Union(results);
return(results);
}
/// <summary>
/// Determines the active user and appends the document processing operations to their active work items.
/// </summary>
/// <param name="userDocuments">The documents whose processing will become active work items.</param>
/// <returns>A <see cref="Task"/> representing the ongoing operation.</returns>
private IEnumerable <WorkItem> CreateWorkItemsForProcessingOperations(IEnumerable <UserDocument> userDocuments) =>
from document in userDocuments
let isCached = ProcessedDocuments.Any(d => d.Name.EqualsIgnoreCase(document.Name))
let state = isCached
? TaskState.Complete
: TaskState.Pending
let statusMessage = isCached
? "Analysis Complete."
: "Pending"
let percentComplete =
isCached ? 100
: 0
select new WorkItem
{
Id = document.Id,
Name = document.Name,
PercentComplete = percentComplete,
State = state,
StatusMessage = statusMessage
};