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using System.Collections.Generic; | |
using System.Collections.ObjectModel; | |
using System.Linq; | |
using System.Threading; | |
using Microsoft.AspNetCore.Mvc.Abstractions; | |
using Microsoft.AspNetCore.Mvc.Infrastructure; | |
using Microsoft.Extensions.Primitives; | |
namespace Microsoft.AspNetCore.Mvc | |
{ | |
public class PollingActionDescriptorCollectionProvider : IActionDescriptorCollectionProvider | |
{ | |
private readonly IActionDescriptorProvider[] _actionDescriptorProviders; | |
private readonly IActionDescriptorChangeProvider[] _actionDescriptorChangeProviders; | |
private ActionDescriptorCollection _collection; | |
private IChangeToken _changeToken; | |
private int _version = -1; | |
public PollingActionDescriptorCollectionProvider( | |
IEnumerable<IActionDescriptorProvider> actionDescriptorProviders, | |
IEnumerable<IActionDescriptorChangeProvider> actionDescriptorChangeProviders) | |
{ | |
_actionDescriptorProviders = actionDescriptorProviders | |
.OrderBy(p => p.Order) | |
.ToArray(); | |
_actionDescriptorChangeProviders = actionDescriptorChangeProviders.ToArray(); | |
_changeToken = GetCompositeChangeToken(); | |
} | |
private IChangeToken GetCompositeChangeToken() | |
{ | |
if (_actionDescriptorChangeProviders.Length == 1) | |
{ | |
return _actionDescriptorChangeProviders[0].GetChangeToken(); | |
} | |
var changeTokens = new IChangeToken[_actionDescriptorChangeProviders.Length]; | |
for (var i = 0; i < _actionDescriptorChangeProviders.Length; i++) | |
{ | |
changeTokens[i] = _actionDescriptorChangeProviders[i].GetChangeToken(); | |
} | |
return new CompositeChangeToken(changeTokens); | |
} | |
public ActionDescriptorCollection ActionDescriptors | |
{ | |
get | |
{ | |
if (_collection == null || _changeToken.HasChanged) | |
{ | |
UpdateCollection(); | |
_changeToken = GetCompositeChangeToken(); | |
} | |
return _collection; | |
} | |
} | |
private void UpdateCollection() | |
{ | |
var context = new ActionDescriptorProviderContext(); | |
for (var i = 0; i < _actionDescriptorProviders.Length; i++) | |
{ | |
_actionDescriptorProviders[i].OnProvidersExecuting(context); | |
} | |
for (var i = _actionDescriptorProviders.Length - 1; i >= 0; i--) | |
{ | |
_actionDescriptorProviders[i].OnProvidersExecuted(context); | |
} | |
_collection = new ActionDescriptorCollection( | |
new ReadOnlyCollection<ActionDescriptor>(context.Results), | |
Interlocked.Increment(ref _version)); | |
} | |
} | |
} |
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