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Implement fast sorting

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This commit is contained in:
Vasily 2020-02-27 20:21:34 +03:00
parent 0f0b89f344
commit ae1f975b99
1 changed files with 52 additions and 6 deletions
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58
MediaBrowser.Controller/Entities/Folder.cs
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@ -807,6 +807,56 @@ namespace MediaBrowser.Controller.Entities
return false;
}
private class OneTimeQueue<T>
{
private List<T> items;
private int start;
public OneTimeQueue(int capacity)
{
items = new List<T>(capacity);
start = 0;
}
public OneTimeQueue(int capacity, T first)
{
items = new List<T>(capacity);
items.Add(first);
start = 0;
}
public void Enqueue(T item)
{
items.Add(item);
}
public T Dequeue()
{
start++;
return items[start - 1];
}
}
private IReadOnlyList<BaseItem> SortItemsByRequest(InternalItemsQuery query, IReadOnlyList<BaseItem> items)
{
var ids = query.ItemIds.ToList();
var positions = new Dictionary<Guid, OneTimeQueue<int>>(ids.Count);
for (int i = 0; i < ids.Count; i++)
{
if (positions.TryGetValue(ids[i], out var q))
{
q.Enqueue(i);
}
else
{
positions.Add(ids[i], new OneTimeQueue<int>(4 /* wild guess */, i));
}
}
var newItems = new BaseItem[ids.Count];
foreach(var item in items)
{
newItems[positions[item.Id].Dequeue()] = item;
}
return newItems;
}
public QueryResult<BaseItem> GetItems(InternalItemsQuery query)
{
if (query.ItemIds.Length > 0)
@ -815,9 +865,7 @@ namespace MediaBrowser.Controller.Entities
if (query.OrderBy.Count == 0 && query.ItemIds.Length > 1)
{
var ids = query.ItemIds.ToList();
// Try to preserve order, "Play To" relies on it
result.Items = result.Items.OrderBy(i => ids.IndexOf(i.Id)).ToArray();
result.Items = SortItemsByRequest(query, result.Items);
}
return result;
}
@ -835,9 +883,7 @@ namespace MediaBrowser.Controller.Entities
if (query.OrderBy.Count == 0 && query.ItemIds.Length > 1)
{
var ids = query.ItemIds.ToList();
// Try to preserve order, "Play To" relies on it
return result.OrderBy(i => ids.IndexOf(i.Id)).ToArray();
return SortItemsByRequest(query, result);
}
return result.ToArray();
}