private ServiceCallSite TryCreateExact(ServiceDescriptor descriptor, Type serviceType, CallSiteChain callSiteChain, int slot)
{
if (serviceType == descriptor.ServiceType)
{
ServiceCallSite callSite;
var lifetime = new ResultCache(descriptor.Lifetime, serviceType, slot);
if (descriptor.ImplementationInstance != null)
{
callSite = new ConstantCallSite(descriptor.ServiceType, descriptor.ImplementationInstance);
}
else if (descriptor.ImplementationFactory != null)
{
callSite = new FactoryCallSite(lifetime, descriptor.ServiceType, descriptor.ImplementationFactory);
}
else if (descriptor.ImplementationType != null)
{
callSite = CreateConstructorCallSite(lifetime, descriptor.ServiceType, descriptor.ImplementationType, callSiteChain);
}
else
{
throw new InvalidOperationException("Invalid service descriptor");
}
return(callSite);
}
return(null);
}
private IServiceCallSite TryCreateExact(ServiceDescriptor descriptor, Type serviceType, CallSiteChain callSiteChain)
{
if (serviceType == descriptor.ServiceType)
{
IServiceCallSite callSite;
if (descriptor.ImplementationInstance != null)
{
callSite = new ConstantCallSite(descriptor.ServiceType, descriptor.ImplementationInstance);
}
else if (descriptor.ImplementationFactory != null)
{
callSite = new FactoryCallSite(descriptor.ServiceType, descriptor.ImplementationFactory);
}
else if (descriptor.ImplementationType != null)
{
callSite = CreateConstructorCallSite(descriptor.ServiceType, descriptor.ImplementationType, callSiteChain);
}
else
{
throw new InvalidOperationException("Invalid service descriptor");
}
callSite = new InterceptionCallSite(_interceptingProxyFactory, callSite);
return(ApplyLifetime(callSite, descriptor, descriptor.Lifetime));
}
return(null);
}
private ServiceCallSite TryCreateExact(ServiceDescriptor descriptor, Type serviceType, CallSiteChain callSiteChain, int slot)
{
if (serviceType == descriptor.ServiceType)
{
ServiceCacheKey callSiteKey = new ServiceCacheKey(serviceType, slot);
if (_callSiteCache.TryGetValue(callSiteKey, out ServiceCallSite serviceCallSite))
{
return(serviceCallSite);
}
ServiceCallSite callSite;
var lifetime = new ResultCache(descriptor.Lifetime, serviceType, slot);
if (descriptor.ImplementationInstance != null)
{
callSite = new ConstantCallSite(descriptor.ServiceType, descriptor.ImplementationInstance);
}
else if (descriptor.ImplementationFactory != null)
{
callSite = new FactoryCallSite(lifetime, descriptor.ServiceType, descriptor.ImplementationFactory);
}
else if (descriptor.ImplementationType != null)
{
callSite = CreateConstructorCallSite(lifetime, descriptor.ServiceType, descriptor.ImplementationType, callSiteChain);
}
else
{
throw new InvalidOperationException(SR.InvalidServiceDescriptor);
}
return(_callSiteCache[callSiteKey] = callSite);
}
return(null);
}
protected override object VisitFactory(FactoryCallSite factoryCallSite, ILEmitResolverBuilderContext argument)
{
if (argument.Factories == null)
{
argument.Factories = new List <Func <IServiceProvider, object> >();
}
// this.Factories[i](ProviderScope)
argument.Generator.Emit(OpCodes.Ldarg_0);
argument.Generator.Emit(OpCodes.Ldfld, FactoriesField);
argument.Generator.Emit(OpCodes.Ldc_I4, argument.Factories.Count);
argument.Generator.Emit(OpCodes.Ldelem, typeof(Func <IServiceProvider, object>));
argument.Generator.Emit(OpCodes.Ldarg_1);
argument.Generator.Emit(OpCodes.Call, ExpressionResolverBuilder.InvokeFactoryMethodInfo);
argument.Factories.Add(factoryCallSite.Factory);
return(null);
}
/// <summary>
/// 根据注册服务的方式进行实例化
/// </summary>
/// <param name="descriptor"></param>
/// <param name="serviceType"></param>
/// <param name="callSiteChain"></param>
/// <param name="slot"></param>
/// <returns></returns>
/// <exception cref="InvalidOperationException"></exception>
private ServiceCallSite TryCreateExact(ServiceDescriptor descriptor, Type serviceType,
CallSiteChain callSiteChain, int slot)
{
//判断基类类型是否与ServiceDescriptor所持有的基类类型是否一致,如果不一致直接返回false
if (serviceType == descriptor.ServiceType)
{
//根据当前注册的生命周期,基类类型和slot实例化一个ResultCache，ResultCache类型具有一个最后结果缓存的位置(相当于跟生命周期一致)和一个缓存Key
ServiceCallSite callSite;
var lifetime = new ResultCache(descriptor.Lifetime, serviceType, slot);
//根据注册时所使用的方式来创建不同的ServiceCallSite,共具有三种ServiceCallSite子类
if (descriptor.ImplementationInstance != null)
{
//注册时直接根据对象进行实例化具体对象(Singleton生命周期独有)
callSite = new ConstantCallSite(descriptor.ServiceType, descriptor.ImplementationInstance);
}
else if (descriptor.ImplementationFactory != null)
{
//FactoryCallSite 注册时根据一个工厂实例化对象
callSite = new FactoryCallSite(lifetime, descriptor.ServiceType, descriptor.ImplementationFactory);
}
else if (descriptor.ImplementationType != null)
{
//ConstructorCallSite 注册时根据具体实例类型进行实例化对象，如果注册类型是使用的派生类类型方式,则调用CreateConstructorCallSite来实例化一个ConstructorCallSite
callSite = CreateConstructorCallSite(lifetime, descriptor.ServiceType,
descriptor.ImplementationType, callSiteChain);
}
else
{
throw new InvalidOperationException("Invalid service descriptor");
}
return(callSite);
}
return(null);
}
protected override Expression VisitFactory(FactoryCallSite factoryCallSite, object context)
{
return(Expression.Invoke(Expression.Constant(factoryCallSite.Factory), ScopeParameter));
}
protected abstract TResult VisitFactory(FactoryCallSite factoryCallSite, TArgument argument);
protected override Type VisitFactory(FactoryCallSite factoryCallSite, CallSiteValidatorState state) => null;
/// <summary>
///
/// </summary>
/// <param name="factoryCallSite"></param>
/// <param name="context"></param>
/// <returns></returns>
protected override object VisitFactory(FactoryCallSite factoryCallSite, RuntimeResolverContext context)
{
//调用工厂方法进行实例化
return(factoryCallSite.Factory(context.Scope));
}
protected override Expression VisitFactory(FactoryCallSite factoryCallSite, ParameterExpression provider)
{
return(Expression.Invoke(Expression.Constant(factoryCallSite.Factory), provider));
}
protected override object VisitFactory(FactoryCallSite factoryCallSite, ServiceProvider2 provider)
{
return(factoryCallSite.Factory(provider));
}
protected override object VisitFactory(FactoryCallSite factoryCallSite, ServiceProviderEngineScope scope)
{
return(factoryCallSite.Factory(scope));
}
