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DefaultNamingSubSystem.cs
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// Copyright 2004-2012 Castle Project - http://www.castleproject.org/
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
namespace Castle.MicroKernel.SubSystems.Naming
{
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using Castle.Core.Internal;
using Castle.MicroKernel.Util;
using Lock = Castle.MicroKernel.Internal.Lock;
[Serializable]
public class DefaultNamingSubSystem : AbstractSubSystem, INamingSubSystem
{
protected readonly Lock @lock = Lock.Create();
/// <summary>
/// Map(String, IHandler) to map component names to <see cref="IHandler" /> Items in this dictionary are sorted in insertion order.
/// </summary>
protected readonly Dictionary<string, IHandler> name2Handler =
new Dictionary<string, IHandler>(StringComparer.OrdinalIgnoreCase);
/// <summary>
/// Map(Type, IHandler) to map a service to <see cref="IHandler" /> . If there is more than a single service of the type, only the first registered services is stored in this dictionary. It serve as a fast lookup for the common case of having a single handler for a type.
/// </summary>
protected readonly Dictionary<Type, HandlerWithPriority> service2Handler =
new Dictionary<Type, HandlerWithPriority>(SimpleTypeEqualityComparer.Instance);
protected IList<IHandlersFilter> filters;
protected IList<IHandlerSelector> selectors;
private readonly IDictionary<Type, IHandler[]> assignableHandlerListsByTypeCache =
new Dictionary<Type, IHandler[]>(SimpleTypeEqualityComparer.Instance);
protected readonly IDictionary<Type, IHandler[]> handlerListsByTypeCache =
new Dictionary<Type, IHandler[]>(SimpleTypeEqualityComparer.Instance);
private Dictionary<string, IHandler> handlerByNameCache;
private Dictionary<Type, IHandler> handlerByServiceCache;
public virtual int ComponentCount
{
get { return HandlerByNameCache.Count; }
}
protected IDictionary<string, IHandler> HandlerByNameCache
{
get
{
var cache = handlerByNameCache;
if (cache != null)
{
return cache;
}
using (@lock.ForWriting())
{
cache = new Dictionary<string, IHandler>(name2Handler, name2Handler.Comparer);
handlerByNameCache = cache;
return cache;
}
}
}
protected IDictionary<Type, IHandler> HandlerByServiceCache
{
get
{
var cache = handlerByServiceCache;
if (cache != null)
{
return cache;
}
using (@lock.ForWriting())
{
cache = new Dictionary<Type, IHandler>(service2Handler.Count, service2Handler.Comparer);
foreach (var item in service2Handler)
{
cache.Add(item.Key, item.Value.Handler);
}
handlerByServiceCache = cache;
return cache;
}
}
}
public void AddHandlerSelector(IHandlerSelector selector)
{
if (selectors == null)
{
selectors = new List<IHandlerSelector>();
}
selectors.Add(selector);
}
public void AddHandlersFilter(IHandlersFilter filter)
{
if (filters == null)
{
filters = new List<IHandlersFilter>();
}
filters.Add(filter);
}
public virtual bool Contains(String name)
{
return HandlerByNameCache.ContainsKey(name);
}
public virtual bool Contains(Type service)
{
return GetHandler(service) != null;
}
public virtual IHandler[] GetAllHandlers()
{
var cache = HandlerByNameCache;
var list = new IHandler[cache.Values.Count];
cache.Values.CopyTo(list, 0);
return list;
}
public virtual IHandler[] GetAssignableHandlers(Type service)
{
if (service == null)
{
throw new ArgumentNullException(nameof(service));
}
if (service == typeof(object))
{
return GetAllHandlers();
}
return GetAssignableHandlersNoFiltering(service);
}
public virtual IHandler GetHandler(String name)
{
if (name == null)
{
throw new ArgumentNullException(nameof(name));
}
if (selectors != null)
{
var selectorsOpinion = GetSelectorsOpinion(name, null);
if (selectorsOpinion != null)
{
return selectorsOpinion;
}
}
IHandler value;
HandlerByNameCache.TryGetValue(name, out value);
return value;
}
public virtual IHandler GetHandler(Type service)
{
if (service == null)
{
throw new ArgumentNullException(nameof(service));
}
if (selectors != null)
{
var selectorsOpinion = GetSelectorsOpinion(null, service);
if (selectorsOpinion != null)
{
return selectorsOpinion;
}
}
IHandler handler;
if (HandlerByServiceCache.TryGetValue(service, out handler))
{
return handler;
}
if (service.GetTypeInfo().IsGenericType && service.GetTypeInfo().IsGenericTypeDefinition == false)
{
var openService = service.GetGenericTypeDefinition();
if (HandlerByServiceCache.TryGetValue(openService, out handler) && handler.Supports(service))
{
return handler;
}
var handlerCandidates = GetHandlers(openService);
foreach (var handlerCandidate in handlerCandidates)
{
if (handlerCandidate.Supports(service))
{
return handlerCandidate;
}
}
}
return null;
}
public virtual IHandler[] GetHandlers(Type service)
{
if (service == null)
{
throw new ArgumentNullException(nameof(service));
}
if (filters != null)
{
var filtersOpinion = GetFiltersOpinion(service);
if (filtersOpinion != null)
{
return filtersOpinion;
}
}
IHandler[] result;
using (var locker = @lock.ForReadingUpgradeable())
{
if (handlerListsByTypeCache.TryGetValue(service, out result))
{
return result;
}
result = GetHandlersNoLock(service);
locker.Upgrade();
handlerListsByTypeCache[service] = result;
}
return result;
}
public virtual void Register(IHandler handler)
{
var name = handler.ComponentModel.Name;
using (@lock.ForWriting())
{
try
{
name2Handler.Add(name, handler);
}
catch (ArgumentException)
{
throw new ComponentRegistrationException(
String.Format(
"Component {0} could not be registered. There is already a component with that name. Did you want to modify the existing component instead? If not, make sure you specify a unique name.",
name));
}
var serviceSelector = GetServiceSelector(handler);
foreach (var service in handler.ComponentModel.Services)
{
var handlerForService = serviceSelector(service);
HandlerWithPriority previous;
if (service2Handler.TryGetValue(service, out previous) == false || handlerForService.Triumphs(previous))
{
service2Handler[service] = handlerForService;
}
}
InvalidateCache();
}
}
protected IHandler[] GetAssignableHandlersNoFiltering(Type service)
{
IHandler[] result;
using (var locker = @lock.ForReadingUpgradeable())
{
if (assignableHandlerListsByTypeCache.TryGetValue(service, out result))
{
return result;
}
locker.Upgrade();
if (assignableHandlerListsByTypeCache.TryGetValue(service, out result))
{
return result;
}
result = name2Handler.Values.Where(h => h.SupportsAssignable(service)).ToArray();
assignableHandlerListsByTypeCache[service] = result;
}
return result;
}
protected virtual IHandler[] GetFiltersOpinion(Type service)
{
if (filters == null)
{
return null;
}
IHandler[] handlers = null;
foreach (var filter in filters)
{
if (filter.HasOpinionAbout(service) == false)
{
continue;
}
if (handlers == null)
{
handlers = GetAssignableHandlersNoFiltering(service);
}
handlers = filter.SelectHandlers(service, handlers);
if (handlers != null)
{
return handlers;
}
}
return null;
}
protected virtual IHandler GetSelectorsOpinion(string name, Type type)
{
if (selectors == null)
{
return null;
}
type = type ?? typeof(object); // if type is null, we want everything, so object does well for that
IHandler[] handlers = null; //only init if we have a selector with an opinion about this type
foreach (var selector in selectors)
{
if (selector.HasOpinionAbout(name, type) == false)
{
continue;
}
if (handlers == null)
{
handlers = GetAssignableHandlersNoFiltering(type);
}
var handler = selector.SelectHandler(name, type, handlers);
if (handler != null)
{
return handler;
}
}
return null;
}
protected void InvalidateCache()
{
handlerListsByTypeCache.Clear();
assignableHandlerListsByTypeCache.Clear();
handlerByNameCache = null;
handlerByServiceCache = null;
}
private IHandler[] GetHandlersNoLock(Type service)
{
//we have 3 segments
const int defaults = 0;
const int regulars = 1;
const int fallbacks = 2;
var handlers = new SegmentedList<IHandler>(3);
foreach (var handler in name2Handler.Values)
{
if (handler.Supports(service) == false)
{
continue;
}
if (IsDefault(handler, service))
{
handlers.AddFirst(defaults, handler);
continue;
}
if (IsFallback(handler, service))
{
handlers.AddLast(fallbacks, handler);
continue;
}
handlers.AddLast(regulars, handler);
}
return handlers.ToArray();
}
private Func<Type, HandlerWithPriority> GetServiceSelector(IHandler handler)
{
var defaultsFilter = handler.ComponentModel.GetDefaultComponentForServiceFilter();
var fallbackFilter = handler.ComponentModel.GetFallbackComponentForServiceFilter();
if (defaultsFilter == null)
{
if (fallbackFilter == null)
{
return service => new HandlerWithPriority(0, handler);
}
return service => new HandlerWithPriority(fallbackFilter(service) ? -1 : 0, handler);
}
if (fallbackFilter == null)
{
return service => new HandlerWithPriority(defaultsFilter(service) ? 1 : 0, handler);
}
return service => new HandlerWithPriority(defaultsFilter(service) ? 1 : (fallbackFilter(service) ? -1 : 0), handler);
}
private bool IsDefault(IHandler handler, Type service)
{
var filter = handler.ComponentModel.GetDefaultComponentForServiceFilter();
if (filter == null)
{
return false;
}
return filter(service);
}
private bool IsFallback(IHandler handler, Type service)
{
var filter = handler.ComponentModel.GetFallbackComponentForServiceFilter();
if (filter == null)
{
return false;
}
return filter(service);
}
protected struct HandlerWithPriority
{
private readonly IHandler handler;
private readonly int priority;
public HandlerWithPriority(int priority, IHandler handler)
{
this.priority = priority;
this.handler = handler;
}
public IHandler Handler
{
get { return handler; }
}
public bool Triumphs(HandlerWithPriority other)
{
if (priority > other.priority)
{
return true;
}
if (priority == other.priority && priority > 0)
{
return true;
}
return false;
}
}
}
}