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Optimize allocations in GetFilters 

Doing it the old fashioned way to get rid of some allocations.
This commit is contained in:
Ryan Nowak 2015-10-05 21:04:48 -07:00
parent e54da5e6f6
commit 082f175b48
1 changed files with 39 additions and 8 deletions
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47
src/Microsoft.AspNet.Mvc.Core/Controllers/FilterActionInvoker.cs
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@ -5,7 +5,6 @@ using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Diagnostics.Tracing;
using System.Linq;
using System.Runtime.ExceptionServices;
using System.Threading.Tasks;
using Microsoft.AspNet.Mvc.Abstractions;
@ -22,6 +21,8 @@ namespace Microsoft.AspNet.Mvc.Controllers
{
public abstract class FilterActionInvoker : IActionInvoker
{
private static readonly IFilterMetadata[] EmptyFilterArray = new IFilterMetadata[0];
private readonly IReadOnlyList<IFilterProvider> _filterProviders;
private readonly IReadOnlyList<IInputFormatter> _inputFormatters;
private readonly IReadOnlyList<IModelBinder> _modelBinders;
@ -223,13 +224,17 @@ namespace Microsoft.AspNet.Mvc.Controllers
private IFilterMetadata[] GetFilters()
{
var context = new FilterProviderContext(
ActionContext,
ActionContext.ActionDescriptor.FilterDescriptors.Select(fd => new FilterItem(fd)).ToList());
foreach (var provider in _filterProviders)
var filterDescriptors = ActionContext.ActionDescriptor.FilterDescriptors;
var items = new List<FilterItem>(filterDescriptors.Count);
for (var i = 0; i < filterDescriptors.Count; i++)
{
provider.OnProvidersExecuting(context);
items.Add(new FilterItem(filterDescriptors[i]));
}
var context = new FilterProviderContext(ActionContext, items);
for (var i = 0; i < _filterProviders.Count; i++)
{
_filterProviders[i].OnProvidersExecuting(context);
}
for (var i = _filterProviders.Count - 1; i >= 0; i--)
@ -237,7 +242,33 @@ namespace Microsoft.AspNet.Mvc.Controllers
_filterProviders[i].OnProvidersExecuted(context);
}
return context.Results.Select(item => item.Filter).Where(filter => filter != null).ToArray();
var count = 0;
for (var i = 0; i < items.Count; i++)
{
if (items[i].Filter != null)
{
count++;
}
}
if (count == 0)
{
return EmptyFilterArray;
}
else
{
var filters = new IFilterMetadata[count];
for (int i = 0, j = 0; i < items.Count; i++)
{
var filter = items[i].Filter;
if (filter != null)
{
filters[j++] = filter;
}
}
return filters;
}
}
private Task InvokeAllAuthorizationFiltersAsync()