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Reduce some allocations with the magic of spans etc.

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This commit is contained in:
cvium
2021-04-30 15:09:36 +02:00
parent eeb5d4bd1e
commit 608cba817c
9 changed files with 267 additions and 95 deletions
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155
Emby.Server.Implementations/Data/SqliteItemRepository.cs
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@@ -1007,15 +1007,12 @@ namespace Emby.Server.Implementations.Data
return;
}
var parts = value.Split('|', StringSplitOptions.RemoveEmptyEntries);
foreach (var part in parts)
foreach (var part in value.SpanSplit('|'))
{
var idParts = part.Split('=');
if (idParts.Length == 2)
var providerDelimiterIndex = part.IndexOf('=');
if (providerDelimiterIndex != -1 && providerDelimiterIndex == part.LastIndexOf('='))
{
item.SetProviderId(idParts[0], idParts[1]);
item.SetProviderId(part.Slice(0, providerDelimiterIndex), part.Slice(providerDelimiterIndex + 1));
}
}
}
@@ -1057,9 +1054,8 @@ namespace Emby.Server.Implementations.Data
return;
}
var parts = value.Split('|' , StringSplitOptions.RemoveEmptyEntries);
var list = new List<ItemImageInfo>();
foreach (var part in parts)
foreach (var part in value.SpanSplit('|'))
{
var image = ItemImageInfoFromValueString(part);
@@ -1094,41 +1090,89 @@ namespace Emby.Server.Implementations.Data
.Append(hash.Replace('*', '/').Replace('|', '\\'));
}
public ItemImageInfo ItemImageInfoFromValueString(string value)
private ItemImageInfo ItemImageInfoFromValueString(ReadOnlySpan<char> value)
{
var parts = value.Split('*', StringSplitOptions.None);
if (parts.Length < 3)
var nextSegment = value.IndexOf('*');
if (nextSegment == -1)
{
return null;
}
var image = new ItemImageInfo();
ReadOnlySpan<char> path = value[..nextSegment];
value = value[(nextSegment + 1)..];
nextSegment = value.IndexOf('*');
if (nextSegment == -1)
{
return null;
}
image.Path = RestorePath(parts[0]);
ReadOnlySpan<char> dateModified = value[..nextSegment];
value = value[(nextSegment + 1)..];
nextSegment = value.IndexOf('*');
if (nextSegment == -1)
{
return null;
}
if (long.TryParse(parts[1], NumberStyles.Any, CultureInfo.InvariantCulture, out var ticks))
ReadOnlySpan<char> imageType = value[..nextSegment];
var image = new ItemImageInfo
{
Path = RestorePath(path.ToString())
};
if (long.TryParse(dateModified, NumberStyles.Any, CultureInfo.InvariantCulture, out var ticks))
{
image.DateModified = new DateTime(ticks, DateTimeKind.Utc);
}
if (Enum.TryParse(parts[2], true, out ImageType type))
if (Enum.TryParse(imageType.ToString(), true, out ImageType type))
{
image.Type = type;
}
if (parts.Length >= 5)
// Optional parameters: width*height*blurhash
if (nextSegment + 1 < value.Length - 1)
{
if (int.TryParse(parts[3], NumberStyles.Integer, CultureInfo.InvariantCulture, out var width)
&& int.TryParse(parts[4], NumberStyles.Integer, CultureInfo.InvariantCulture, out var height))
value = value[(nextSegment + 1)..];
nextSegment = value.IndexOf('*');
ReadOnlySpan<char> widthSpan = value[..nextSegment];
value = value[(nextSegment + 1)..];
nextSegment = value.IndexOf('*');
if (nextSegment == -1)
{
return image;
}
ReadOnlySpan<char> heightSpan = value[..nextSegment];
if (int.TryParse(widthSpan, NumberStyles.Integer, CultureInfo.InvariantCulture, out var width)
&& int.TryParse(heightSpan, NumberStyles.Integer, CultureInfo.InvariantCulture, out var height))
{
image.Width = width;
image.Height = height;
}
if (parts.Length >= 6)
nextSegment += 1;
if (nextSegment < value.Length - 1)
{
image.BlurHash = parts[5].Replace('/', '*').Replace('\\', '|');
value = value[nextSegment..];
var length = value.Length;
Span<char> blurHashSpan = stackalloc char[length];
for (int i = 0; i < length; i++)
{
var c = value[i];
blurHashSpan[i] = c switch
{
'/' => '*',
'\\' => '|',
_ => c
};
}
image.BlurHash = new string(blurHashSpan);
}
}
@@ -2118,27 +2162,6 @@ namespace Emby.Server.Implementations.Data
private readonly ItemFields[] _allFields = Enum.GetValues<ItemFields>();
private string[] GetColumnNamesFromField(ItemFields field)
{
switch (field)
{
case ItemFields.Settings:
return new[] { "IsLocked", "PreferredMetadataCountryCode", "PreferredMetadataLanguage", "LockedFields" };
case ItemFields.ServiceName:
return new[] { "ExternalServiceId" };
case ItemFields.SortName:
return new[] { "ForcedSortName" };
case ItemFields.Taglines:
return new[] { "Tagline" };
case ItemFields.Tags:
return new[] { "Tags" };
case ItemFields.IsHD:
return Array.Empty<string>();
default:
return new[] { field.ToString() };
}
}
private bool HasField(InternalItemsQuery query, ItemFields name)
{
switch (name)
@@ -2327,9 +2350,32 @@ namespace Emby.Server.Implementations.Data
{
if (!HasField(query, field))
{
foreach (var fieldToRemove in GetColumnNamesFromField(field))
switch (field)
{
list.Remove(fieldToRemove);
case ItemFields.Settings:
list.Remove("IsLocked");
list.Remove("PreferredMetadataCountryCode");
list.Remove("PreferredMetadataLanguage");
list.Remove("LockedFields");
break;
case ItemFields.ServiceName:
list.Remove("ExternalServiceId");
break;
case ItemFields.SortName:
list.Remove("ForcedSortName");
break;
case ItemFields.Taglines:
list.Remove("Tagline");
break;
case ItemFields.Tags:
list.Remove("Tags");
break;
case ItemFields.IsHD:
// do nothing
break;
default:
list.Remove(field.ToString());
break;
}
}
}
@@ -2575,10 +2621,21 @@ namespace Emby.Server.Implementations.Data
query.Limit = query.Limit.Value + 4;
}
var commandText = "select "
+ string.Join(',', GetFinalColumnsToSelect(query, new[] { "count(distinct PresentationUniqueKey)" }))
+ GetFromText()
+ GetJoinUserDataText(query);
var commandText = "select ";
if (EnableGroupByPresentationUniqueKey(query))
{
commandText += "count (distinct PresentationUniqueKey)";
}
else if (query.GroupBySeriesPresentationUniqueKey)
{
commandText += "count (distinct SeriesPresentationUniqueKey)";
}
else
{
commandText += "count (guid)";
}
commandText += GetFromText() + GetJoinUserDataText(query);
var whereClauses = GetWhereClauses(query, null);
if (whereClauses.Count != 0)