.net Microsoft Unity-DerivedTypeConstructorSelectorPolicy内存泄漏
因此,我们遇到了一个问题,即容器在应用程序期间一直保留DerivedTypeConstructorSelectorPolicy的实例。如果不是因为TypeInterceptionStrategy中的以下两行代码将旧策略包装成一个新策略这一事实,那么这就不会那么糟糕了,新策略现在保留了两个实例(或者更多,对于一个被拦截的类,每次调用解析都会使问题复杂化)。运行.NET内存分析器时可以看到这一点.net Microsoft Unity-DerivedTypeConstructorSelectorPolicy内存泄漏,.net,memory-leaks,unity-container,.net,Memory Leaks,Unity Container,因此,我们遇到了一个问题,即容器在应用程序期间一直保留DerivedTypeConstructorSelectorPolicy的实例。如果不是因为TypeInterceptionStrategy中的以下两行代码将旧策略包装成一个新策略这一事实,那么这就不会那么糟糕了,新策略现在保留了两个实例(或者更多,对于一个被拦截的类,每次调用解析都会使问题复杂化)。运行.NET内存分析器时可以看到这一点 IConstructorSelectorPolicy originalConstructorSelect
IConstructorSelectorPolicy originalConstructorSelectorPolicy = PolicyListExtensions.Get<IConstructorSelectorPolicy>(context.Policies, (object) context.BuildKey, out containingPolicyList);
PolicyListExtensions.Set<IConstructorSelectorPolicy>(containingPolicyList, (IConstructorSelectorPolicy) new TypeInterceptionStrategy.DerivedTypeConstructorSelectorPolicy(proxyType, originalConstructorSelectorPolicy), (object) context.BuildKey);
IConstructorSelectorPolicy originalConstructorSelectorPolicy=PolicyListExtensions.Get(context.Policies,(object)context.BuildKey,out containingPolicyList);
PolicyListExtensions.Set(包含PolicyList,(IConstructorSelectorPolicy)新类型拦截策略。派生类型构造函数SelectorPolicy(proxyType,originalConstructorSelectorPolicy),(对象)上下文.BuildKey);
当有很多类被截获时,这会导致Gen 2集合的抖动,然后在内存中出现GC无法回收的漏洞,尤其是在复制策略以确保线程安全的情况下。一旦您在策略列表中有足够数量的项,它将被移动到LOH,这使得打击更加严重
我应该提醒大家,我们的应用程序是在IIS经典而非集成管道中运行的,并且是在32位模式下运行的,我知道这是双重打击。在64位模式下,有了更多的可寻址空间,情况就不会那么糟了。但是,我们仍然被IIS提供给我们的虚拟内存所困扰,这很快就会发生,因为GC在VM映射中找不到足够的空间来分配额外的内存,请求开始消亡
该文件只有3个版本,原始版本看起来似乎没有这个问题。有没有其他人遇到过这个问题,或者我遗漏了一些可能可以解释这种行为的东西
pastebin上发布了一个非常简单的程序链接,说明了这一点:
使用.NET内存探查器(或您选择的探查器)并观察DerivedTypeConstructorSelectorPolicy,您可以观察它在每次迭代中的增长,随着它的增长,您可以检查并看到originalConstructorSelectorPolicy在长链中不断引用旧实例
例如,我们拦截了多少个类,大约有1300个注册。与此同时,我找到了一个解决方案。这是一个简单的修复,但它要求您覆盖拦截并键入拦截策略。修复方法是一行程序,只需检查策略列表中出现的类型 这是TypeInterceptionStrategy中的代码:
if (originalConstructorSelectorPolicy is DefaultUnityConstructorSelectorPolicy)
{
containingPolicyList.Set<IConstructorSelectorPolicy>(new CustomDerivedTypeConstructorSelectorPolicy(proxyType, originalConstructorSelectorPolicy), context.BuildKey);
}
if(原始构造函数SelectorPolicy为DefaultUnityConstructorSelectorPolicy)
{
containingPolicyList.Set(新的CustomDerivedTypeConstructorSelectorPolicy(proxyType,originalConstructorSelectorPolicy),context.BuildKey);
}
当然,为了改变这一点,您必须复制TypeInterceptionStrategy,并执行与该修复相同的操作,它不能简单地通过覆盖预构建方法来修复
我在这里粘贴整个修复程序,以防其他人遇到问题
public class CustomTypeInterceptionStrategy : BuilderStrategy
{
public override void PreBuildUp(IBuilderContext context)
{
Guard.ArgumentNotNull(context, "context");
if (context.Existing != null)
{
return;
}
Type type = context.BuildKey.Type;
ITypeInterceptionPolicy typePolicy = FindInterceptionPolicy<ITypeInterceptionPolicy>(context);
if (typePolicy == null)
{
return;
}
ITypeInterceptor interceptor = typePolicy.GetInterceptor(context);
if (!interceptor.CanIntercept(type))
{
return;
}
IInterceptionBehaviorsPolicy behaviorPolicy = FindInterceptionPolicy<IInterceptionBehaviorsPolicy>(context);
IEnumerable<IInterceptionBehavior> interceptionBehaviors = behaviorPolicy == null
? Enumerable.Empty<IInterceptionBehavior>()
: behaviorPolicy.GetEffectiveBehaviors(context, interceptor, type, type).Where(ib => ib.WillExecute);
IAdditionalInterfacesPolicy interceptionPolicy3 = FindInterceptionPolicy<IAdditionalInterfacesPolicy>(context);
IEnumerable<Type> additionalInterfaces1 = interceptionPolicy3 != null ? interceptionPolicy3.AdditionalInterfaces : Type.EmptyTypes;
context.Policies.Set(new CustomEffectiveInterceptionBehaviorsPolicy() { Behaviors = interceptionBehaviors }, context.BuildKey);
Type[] additionalInterfaces2 = Intercept.GetAllAdditionalInterfaces(interceptionBehaviors, additionalInterfaces1);
Type proxyType = interceptor.CreateProxyType(type, additionalInterfaces2);
IPolicyList containingPolicyList;
IConstructorSelectorPolicy originalConstructorSelectorPolicy = context.Policies.Get<IConstructorSelectorPolicy>(context.BuildKey, out containingPolicyList);
if (originalConstructorSelectorPolicy is DefaultUnityConstructorSelectorPolicy)
{
containingPolicyList.Set<IConstructorSelectorPolicy>(new CustomDerivedTypeConstructorSelectorPolicy(proxyType, originalConstructorSelectorPolicy), context.BuildKey);
}
}
public override void PostBuildUp(IBuilderContext context)
{
Guard.ArgumentNotNull(context, "context");
IInterceptingProxy interceptingProxy = context.Existing as IInterceptingProxy;
if (interceptingProxy == null)
{
return;
}
CustomEffectiveInterceptionBehaviorsPolicy interceptionBehaviorsPolicy = context.Policies.Get<CustomEffectiveInterceptionBehaviorsPolicy>(context.BuildKey, true);
if (interceptionBehaviorsPolicy == null)
{
return;
}
foreach (IInterceptionBehavior interceptor in interceptionBehaviorsPolicy.Behaviors)
{
interceptingProxy.AddInterceptionBehavior(interceptor);
}
}
private static TPolicy FindInterceptionPolicy<TPolicy>(IBuilderContext context) where TPolicy : class, IBuilderPolicy
{
TPolicy policy = context.Policies.Get<TPolicy>(context.BuildKey, false);
if (policy != null)
{
return policy;
}
return context.Policies.Get<TPolicy>(context.BuildKey.Type, false);
}
private class CustomEffectiveInterceptionBehaviorsPolicy : IBuilderPolicy
{
public CustomEffectiveInterceptionBehaviorsPolicy()
{
this.Behaviors = new List<IInterceptionBehavior>();
}
public IEnumerable<IInterceptionBehavior> Behaviors { get; set; }
}
private class CustomDerivedTypeConstructorSelectorPolicy : IConstructorSelectorPolicy
{
private readonly Type interceptingType;
private readonly IConstructorSelectorPolicy originalConstructorSelectorPolicy;
public CustomDerivedTypeConstructorSelectorPolicy(Type interceptingType, IConstructorSelectorPolicy originalConstructorSelectorPolicy)
{
this.interceptingType = interceptingType;
this.originalConstructorSelectorPolicy = originalConstructorSelectorPolicy;
}
public SelectedConstructor SelectConstructor(IBuilderContext context, IPolicyList resolverPolicyDestination)
{
return FindNewConstructor(this.originalConstructorSelectorPolicy.SelectConstructor(context, resolverPolicyDestination), this.interceptingType);
}
private static SelectedConstructor FindNewConstructor(SelectedConstructor originalConstructor, Type interceptingType)
{
ParameterInfo[] parameters = originalConstructor.Constructor.GetParameters();
SelectedConstructor selectedConstructor = new SelectedConstructor(interceptingType.GetConstructor(parameters.Select(pi => pi.ParameterType).ToArray()));
foreach (string newKey in originalConstructor.GetParameterKeys())
{
selectedConstructor.AddParameterKey(newKey);
}
return selectedConstructor;
}
}
}
public class CustomInterception : Interception
{
protected override void Initialize()
{
this.Context.Strategies.AddNew<InstanceInterceptionStrategy>(UnityBuildStage.Setup);
this.Context.Strategies.AddNew<CustomTypeInterceptionStrategy>(UnityBuildStage.PreCreation);
this.Context.Container.RegisterInstance(typeof(AttributeDrivenPolicy).AssemblyQualifiedName, (InjectionPolicy)new AttributeDrivenPolicy());
}
}
公共类CustomTypeInterceptionStrategy:BuilderStrategy
{
公共覆盖无效预构建(IBuilderContext上下文)
{
ArgumentNotNull(上下文,“上下文”);
if(context.Existing!=null)
{
返回;
}
Type Type=context.BuildKey.Type;
ITypeInterceptionPolicyTypePolicy=FindInterceptionPolicy(上下文);
if(typePolicy==null)
{
返回;
}
ITypeInterceptor interceptor=typePolicy.GetInterceptor(上下文);
if(!interceptor.CanIntercept(类型))
{
返回;
}
IIInterceptionBehaviorPolicy behaviorPolicy=FindInterceptionPolicy(上下文);
IEnumerable拦截行为=行为策略==null
?可枚举。空()
:behaviorPolicy.GetEffectiveBehaviors(上下文、拦截器、类型、类型)。其中(ib=>ib.WillExecute);
IAdditionalInterfacesPolicy拦截策略3=FindInterceptionPolicy(上下文);
IEnumerable additionalInterfaces1=interceptionPolicy3!=null?interceptionPolicy3.AdditionalInterfaces:Type.EmptyTypes;
context.Policies.Set(新的CustomEffectiveInterceptionBehaviorsPolicy(){Behaviors=interceptionBehaviors},context.BuildKey);
类型[]additionalInterfaces2=Intercept.GetAllAdditionalInterfaces(interceptionBehaviors,additionalInterfaces1);
Type proxyType=拦截器.CreateProxyType(Type,additionalInterfaces2);
包含保单列表的IPolicyList;
IConstructorSelectorPolicy originalConstructorSelectorPolicy=context.Policies.Get(context.BuildKey,out containingPolicyList);
如果(原始构造函数SelectorPolicy为DefaultUnityConstructorSelectorPolicy)
{
containingPolicyList.Set(新的CustomDerivedTypeConstructorSelectorPolicy(proxyType,originalConstructorSelectorPolicy),context.BuildKey);
}
}
公共覆盖无效后期构建(IBuilderContext上下文)
{
ArgumentNotNull(上下文,“上下文”);
IIInterceptingProxy interceptingProxy=上下文。作为IIInterceptingProxy存在;
if(拦截代理==null)
{
返回;
}
CustomEffectiveInterceptionBehaviorPolicy InterceptionBehaviorPolicy=context.Policies.Get(context.BuildKey,true);
if(侦听行为策略==null)
{
返回;
}
foreach(interceptionBehaviorsPolicy.Behaviors中的IIInterceptionBehavior拦截器)
{
InterceptionProxy.AddInterceptionBehavior(拦截器);
}
}
私人静电