private IServiceCallSite[] CreateArgumentCallSites(
Type serviceType,
Type implementationType,
CallSiteChain callSiteChain,
ParameterInfo[] parameters,
bool throwIfCallSiteNotFound)
{
var parameterCallSites = new IServiceCallSite[parameters.Length];
for (var index = 0; index < parameters.Length; index++)
{
var callSite = CreateCallSite(parameters[index].ParameterType, callSiteChain);
if (callSite == null && ParameterDefaultValue.TryGetDefaultValue(parameters[index], out var defaultValue))
{
callSite = new ConstantCallSite(serviceType, defaultValue);
}
if (callSite == null)
{
if (throwIfCallSiteNotFound)
{
throw new InvalidOperationException(Resources.FormatCannotResolveService(
parameters[index].ParameterType,
implementationType));
}
return(null);
}
parameterCallSites[index] = callSite;
}
return(parameterCallSites);
}
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);
}
private ServiceCallSite[] CreateArgumentCallSites(
Type serviceType,
Type implementationType,
CallSiteChain callSiteChain,
ParameterInfo[] parameters,
bool throwIfCallSiteNotFound)
{
var parameterCallSites = new List <ServiceCallSite>(parameters.Length);
foreach (var item in parameters)
{
var callSite = GetCallSite(item.ParameterType, callSiteChain);
if (callSite is null && TryGetDefaultValue(item, out var defaultValue))
{
callSite = new ConstantCallSite(serviceType, defaultValue);
}
if (callSite is null)
{
if (throwIfCallSiteNotFound)
{
throw new InvalidOperationException(string.Format("Unable to resolve service for type '{0}' while attempting to activate '{1}'.",
item.ParameterType,
implementationType));
}
return(null);
}
parameterCallSites.Add(callSite);
}
return(parameterCallSites.ToArray());
}
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[] PopulateCallSites(
ServiceProvider provider,
ISet <Type> callSiteChain,
ParameterInfo[] parameters,
bool throwIfCallSiteNotFound)
{
var parameterCallSites = new IServiceCallSite[parameters.Length];
for (var index = 0; index < parameters.Length; index++)
{
var callSite = provider.GetServiceCallSite(parameters[index].ParameterType, callSiteChain);
if (callSite == null && parameters[index].HasDefaultValue)
{
callSite = new ConstantCallSite(parameters[index].DefaultValue);
}
if (callSite == null)
{
if (throwIfCallSiteNotFound)
{
throw new InvalidOperationException(Resources.FormatCannotResolveService(
parameters[index].ParameterType,
_descriptor.ImplementationType));
}
return(null);
}
parameterCallSites[index] = callSite;
}
return(parameterCallSites);
}
private ServiceCallSite[] CreateArgumentCallSites(
Type implementationType,
CallSiteChain callSiteChain,
ParameterInfo[] parameters,
bool throwIfCallSiteNotFound)
{
var parameterCallSites = new ServiceCallSite[parameters.Length];
for (int index = 0; index < parameters.Length; index++)
{
Type parameterType = parameters[index].ParameterType;
ServiceCallSite callSite = GetCallSite(parameterType, callSiteChain);
if (callSite == null && ParameterDefaultValue.TryGetDefaultValue(parameters[index], out object defaultValue))
{
callSite = new ConstantCallSite(parameterType, defaultValue);
}
if (callSite == null)
{
if (throwIfCallSiteNotFound)
{
throw new InvalidOperationException(SR.Format(SR.CannotResolveService,
parameterType,
implementationType));
}
return(null);
}
parameterCallSites[index] = callSite;
}
return(parameterCallSites);
}
protected override object VisitConstant(ConstantCallSite constantCallSite, ILEmitResolverBuilderContext argument)
{
AddConstant(argument, constantCallSite.DefaultValue);
if (constantCallSite.ServiceType.IsValueType)
{
argument.Generator.Emit(OpCodes.Unbox_Any, constantCallSite.ServiceType);
}
return(null);
}
private ServiceCallSite[] CreateArgumentCallSites(
Type serviceType,
Type implementationType,
CallSiteChain callSiteChain,
ParameterInfo[] parameters,
bool throwIfCallSiteNotFound)
{
var parameterCallSites = new ServiceCallSite[parameters.Length];
for (var index = 0; index < parameters.Length; index++)
{
// 依次递归调用获取指定参数的ServiceCallSite
var callSite = GetCallSite(parameters[index].ParameterType, callSiteChain);
if (callSite == null &&
ParameterDefaultValue.TryGetDefaultValue(parameters[index], out var defaultValue))
{
// 如果获取参数的ServiceCallSite失败但是该参数具有默认值
// 则直接以默认值来创建ConstantCallSite对象
callSite = new ConstantCallSite(serviceType, defaultValue);
}
// 如果当前callSite还为空,则代表出现无法实例化的参数类型
// 如果允许抛出异常则抛出异常,如果不允许抛出异常则返回null
if (callSite == null)
{
if (throwIfCallSiteNotFound)
{
throw new InvalidOperationException(Resources.FormatCannotResolveService(
parameters[index].ParameterType,
implementationType));
}
return(null);
}
parameterCallSites[index] = callSite;
}
return(parameterCallSites);
}
/// <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 VisitConstant(ConstantCallSite constantCallSite, object context)
{
return(Expression.Constant(constantCallSite.DefaultValue));
}
protected abstract TResult VisitConstant(ConstantCallSite constantCallSite, TArgument argument);
protected override Type VisitConstant(ConstantCallSite constantCallSite, CallSiteValidatorState state) => null;
protected override Expression VisitConstant(ConstantCallSite constantCallSite, ParameterExpression provider)
{
return(Expression.Constant(constantCallSite.DefaultValue));
}
protected override object VisitConstant(ConstantCallSite constantCallSite, ILEmitResolverBuilderContext argument)
{
AddConstant(argument, constantCallSite.DefaultValue);
return(null);
}
protected override object VisitConstant(ConstantCallSite constantCallSite, RuntimeResolverContext context)
{
return(constantCallSite.DefaultValue);//直接返回ConstantCallSite的值
}
private IServiceCallSite[] PopulateCallSites(
ServiceProvider provider,
ISet<Type> callSiteChain,
ParameterInfo[] parameters,
bool throwIfCallSiteNotFound)
{
var parameterCallSites = new IServiceCallSite[parameters.Length];
for (var index = 0; index < parameters.Length; index++)
{
var callSite = provider.GetServiceCallSite(parameters[index].ParameterType, callSiteChain);
if (callSite == null && parameters[index].HasDefaultValue)
{
callSite = new ConstantCallSite(parameters[index].DefaultValue);
}
if (callSite == null)
{
if (throwIfCallSiteNotFound)
{
throw new InvalidOperationException(Resources.FormatCannotResolveService(
parameters[index].ParameterType,
_descriptor.ImplementationType));
}
return null;
}
parameterCallSites[index] = callSite;
}
return parameterCallSites;
}
protected override object VisitConstant(ConstantCallSite constantCallSite, ServiceProvider provider)
{
return(constantCallSite.DefaultValue);
}
