/// <summary>
/// get activation strategy delegate
/// </summary>
/// <param name="scope"></param>
/// <param name="request"></param>
/// <returns></returns>
public override IActivationExpressionResult GetActivationExpression(IInjectionScope scope, IActivationExpressionRequest request)
{
var closedClass = typeof(TypedDelegateExpression <>).MakeGenericType(request.ActivationType.GenericTypeArguments);
var closedMethod = closedClass.GetRuntimeMethod(nameof(TypedDelegateExpression <object> .CreateFunc), new Type[] { });
var instance = Activator.CreateInstance(closedClass, scope, request, this);
request.RequireExportScope();
request.RequireDisposalScope();
var callExpression =
Expression.Call(Expression.Constant(instance), closedMethod);
return(request.Services.Compiler.CreateNewResult(request, callExpression));
}
/// <summary>
/// Get an activation expression for this strategy
/// </summary>
/// <param name="scope"></param>
/// <param name="request"></param>
/// <returns></returns>
public override IActivationExpressionResult GetActivationExpression(IInjectionScope scope, IActivationExpressionRequest request)
{
var closedClass = typeof(FuncExpression <, , ,>).MakeGenericType(request.ActivationType.GenericTypeArguments);
var closedMethod = closedClass.GetRuntimeMethod(nameof(FuncExpression <object, object, object, object> .CreateFunc), new[] { typeof(IExportLocatorScope), typeof(IDisposalScope), typeof(IInjectionContext) });
var instance = Activator.CreateInstance(closedClass, scope, request, request.Services.InjectionContextCreator, this);
request.RequireExportScope();
request.RequireDisposalScope();
var callExpression =
Expression.Call(Expression.Constant(instance), closedMethod, request.ScopeParameter,
request.DisposalScopeExpression, request.InjectionContextParameter);
return(request.Services.Compiler.CreateNewResult(request, callExpression));
}
/// <summary>
/// Create expression to add instance to disposal scope
/// </summary>
/// <param name="scope">scope for strategy</param>
/// <param name="request">request</param>
/// <param name="activationConfiguration">activation configuration</param>
/// <param name="result">result for instantiation</param>
/// <returns></returns>
public IActivationExpressionResult CreateExpression(IInjectionScope scope, IActivationExpressionRequest request, TypeActivationConfiguration activationConfiguration, IActivationExpressionResult result)
{
var closedActionType = typeof(Action <>).MakeGenericType(activationConfiguration.ActivationType);
object disposalDelegate = null;
if (closedActionType == activationConfiguration.DisposalDelegate?.GetType())
{
disposalDelegate = activationConfiguration.DisposalDelegate;
}
MethodInfo closedGeneric;
Expression[] parameterExpressions;
var resultExpression = result.Expression;
if (resultExpression.Type != activationConfiguration.ActivationType)
{
resultExpression = Expression.Convert(resultExpression, activationConfiguration.ActivationType);
}
if (disposalDelegate != null)
{
closedGeneric = AddMethodWithCleanup.MakeGenericMethod(activationConfiguration.ActivationType);
parameterExpressions = new[] { resultExpression, Expression.Convert(Expression.Constant(disposalDelegate), closedActionType) };
}
else
{
closedGeneric = AddMethod.MakeGenericMethod(activationConfiguration.ActivationType);
parameterExpressions = new[] { resultExpression };
}
request.RequireDisposalScope();
var disposalCall = Expression.Call(request.DisposalScopeExpression, closedGeneric, parameterExpressions);
var disposalResult = request.Services.Compiler.CreateNewResult(request, disposalCall);
disposalResult.AddExpressionResult(result);
return(disposalResult);
}
/// <summary>
/// Get an activation expression for this strategy
/// </summary>
/// <param name="scope"></param>
/// <param name="request"></param>
/// <returns></returns>
public override IActivationExpressionResult GetActivationExpression(IInjectionScope scope, IActivationExpressionRequest request)
{
var invokeMethod = request.ActivationType.GetTypeInfo().GetDeclaredMethod("Invoke");
var list = new List <Type>(invokeMethod.GetParameters().Select(p => p.ParameterType));
list.Add(invokeMethod.ReturnType);
list.Add(request.ActivationType);
var closedClass = typeof(DelegateExpression <, ,>).MakeGenericType(list.ToArray());
var closedMethod = closedClass.GetRuntimeMethod(nameof(DelegateExpression <object, object, object> .CreateDelegate), new[] { typeof(IExportLocatorScope), typeof(IDisposalScope), typeof(IInjectionContext) });
var instance = Activator.CreateInstance(closedClass, scope, request, request.Services.InjectionContextCreator, this);
request.RequireExportScope();
request.RequireDisposalScope();
var callExpression =
Expression.Call(Expression.Constant(instance), closedMethod, request.ScopeParameter,
request.DisposalScopeExpression, request.InjectionContextParameter);
return(request.Services.Compiler.CreateNewResult(request, callExpression));
}
/// <inheritdoc />
protected override IActivationExpressionResult CreateExpression(IInjectionScope scope, IActivationExpressionRequest request, ICompiledLifestyle lifestyle)
{
if (_proxyType == null)
{
lock (_proxyTypeLock)
{
if (_proxyType == null)
{
var builder = new DynamicTypeBuilder();
_proxyType = builder.CreateType(ActivationType, out _delegateInfo);
}
}
}
request.RequireExportScope();
request.RequireDisposalScope();
request.RequireInjectionContext();
var parameters = new List <Expression>
{
request.ScopeParameter,
request.DisposalScopeExpression,
request.InjectionContextParameter
};
var uniqueId = UniqueStringId.Generate();
foreach (var delegateInfo in _delegateInfo)
{
var locateType = delegateInfo.Method.ReturnType;
var newRequest = request.NewRequest(locateType, this, ActivationType, RequestType.Other, null, true);
newRequest.AddKnownValueExpression(
CreateKnownValueExpression(newRequest, ActivationType, uniqueId));
if (delegateInfo.Method.Name.StartsWith("Get"))
{
newRequest.SetLocateKey(delegateInfo.Method.Name.Substring("Get".Length));
}
if (delegateInfo.ParameterInfos != null)
{
foreach (var parameter in delegateInfo.ParameterInfos)
{
newRequest.AddKnownValueExpression(
CreateKnownValueExpression(newRequest, parameter.ParameterInfo.ParameterType, parameter.UniqueId, parameter.ParameterInfo.Name, parameter.ParameterInfo.Position));
}
}
var result = request.Services.ExpressionBuilder.GetActivationExpression(request.RequestingScope, newRequest);
var compiledDelegate = request.Services.Compiler.CompileDelegate(request.RequestingScope, result);
parameters.Add(Expression.Constant(compiledDelegate));
}
var constructor = _proxyType.GetTypeInfo().DeclaredConstructors.First();
request.RequireInjectionContext();
var newStatement = Expression.New(constructor, parameters);
var setMethod = typeof(IExtraDataContainer).GetRuntimeMethod(nameof(IExtraDataContainer.SetExtraData),
new[] { typeof(object), typeof(object), typeof(bool) });
var invokeStatement = Expression.Call(request.InjectionContextParameter, setMethod,
Expression.Constant(uniqueId), newStatement, Expression.Constant(true));
var castStatement = Expression.Convert(invokeStatement, ActivationType);
return(request.Services.Compiler.CreateNewResult(request, castStatement));
}
/// <summary>
/// Applies null check and disposal scope tracking logic to an expression
/// </summary>
/// <param name="scope"></param>
/// <param name="request"></param>
/// <param name="expression"></param>
/// <param name="allowDisposableTracking"></param>
/// <param name="allowNull"></param>
/// <returns></returns>
public static Expression ApplyNullCheckAndAddDisposal(IInjectionScope scope,
IActivationExpressionRequest request, Expression expression, bool allowDisposableTracking, bool allowNull)
{
if (expression.Type != request.ActivationType &&
!ReflectionService.CheckTypeIsBasedOnAnotherType(expression.Type, request.ActivationType))
{
expression = Expression.Convert(expression, request.ActivationType);
}
if (!allowDisposableTracking)
{
if (request.DefaultValue != null)
{
var method = typeof(ExpressionUtilities).GetRuntimeMethods()
.FirstOrDefault(m => m.Name == nameof(ValueOrDefault));
var closedMethod = method.MakeGenericMethod(request.ActivationType);
return(Expression.Call(closedMethod, expression, Expression.Constant(request.DefaultValue.DefaultValue, request.ActivationType)));
}
if (!allowNull &&
!scope.ScopeConfiguration.Behaviors.AllowInstanceAndFactoryToReturnNull &&
request.IsRequired)
{
var closedMethod = CheckForNullMethodInfo.MakeGenericMethod(request.ActivationType);
return(Expression.Call(closedMethod,
Expression.Constant(request.GetStaticInjectionContext()),
expression));
}
return(expression);
}
if (request.DefaultValue != null)
{
request.RequireDisposalScope();
var method = typeof(ExpressionUtilities).GetRuntimeMethods()
.FirstOrDefault(m => m.Name == nameof(AddToDisposableScopeOrDefault));
var closedMethod = method.MakeGenericMethod(request.ActivationType);
return(Expression.Call(closedMethod, request.DisposalScopeExpression, expression, Expression.Constant(request.DefaultValue.DefaultValue, request.ActivationType)));
}
if (allowNull ||
scope.ScopeConfiguration.Behaviors.AllowInstanceAndFactoryToReturnNull ||
!request.IsRequired)
{
request.RequireDisposalScope();
var closedMethod = AddToDisposalScopeMethodInfo.MakeGenericMethod(request.ActivationType);
return(Expression.Call(closedMethod, request.DisposalScopeExpression, expression));
}
else
{
request.RequireDisposalScope();
var closedMethod = CheckForNullAndAddToDisposalScopeMethodInfo.MakeGenericMethod(request.ActivationType);
return(Expression.Call(closedMethod,
request.DisposalScopeExpression,
Expression.Constant(request.GetStaticInjectionContext()), expression));
}
}
/// <summary>
/// Get expression result from request
/// </summary>
/// <param name="scope"></param>
/// <param name="request"></param>
/// <param name="activationType"></param>
/// <param name="key"></param>
/// <returns></returns>
protected virtual IActivationExpressionResult GetValueFromRequest(IInjectionScope scope,
IActivationExpressionRequest request,
Type activationType,
object key)
{
var knownValues =
request.KnownValueExpressions.Where(
v => activationType.GetTypeInfo().IsAssignableFrom(v.ActivationType.GetTypeInfo())).ToArray();
if (knownValues.Length > 0)
{
if (knownValues.Length == 1)
{
return(knownValues[0].ValueExpression(request));
}
if (key != null)
{
IKnownValueExpression knownValue;
if (key is string keyString)
{
knownValue =
knownValues.FirstOrDefault(v =>
string.Compare(keyString, v.Key as string, StringComparison.CurrentCultureIgnoreCase) == 0);
}
else
{
knownValue = knownValues.FirstOrDefault(v => v.Key == key);
}
if (knownValue != null)
{
return(knownValue.ValueExpression(request));
}
}
if (request.Info is MemberInfo memberInfo)
{
var knownValue = knownValues.FirstOrDefault(v => Equals(v.Key, memberInfo.Name));
if (knownValue != null)
{
return(knownValue.ValueExpression(request));
}
}
if (request.Info is ParameterInfo parameterInfo)
{
var knownValue = knownValues.FirstOrDefault(v => Equals(v.Key, parameterInfo.Name));
if (knownValue != null)
{
return(knownValue.ValueExpression(request));
}
knownValue = knownValues.FirstOrDefault(v =>
Equals(v.Position.GetValueOrDefault(-1), parameterInfo.Position));
if (knownValue != null)
{
return(knownValue.ValueExpression(request));
}
}
return(knownValues[0].ValueExpression(request));
}
if (request.WrapperPathNode != null)
{
var configuration = request.WrapperPathNode.Strategy.GetActivationConfiguration(activationType);
if (configuration.ActivationType != null &&
(activationType.GetTypeInfo().IsAssignableFrom(configuration.ActivationType.GetTypeInfo()) ||
activationType.IsConstructedGenericType && activationType.GetGenericTypeDefinition() == configuration.ActivationType))
{
var wrapper = request.PopWrapperPathNode();
return(ProcessPathNode(scope, request, activationType, wrapper));
}
}
else if (request.DecoratorPathNode != null)
{
var configuration = request.DecoratorPathNode.Strategy.GetActivationConfiguration(activationType);
if (configuration.ActivationType != null &&
(activationType.GetTypeInfo().IsAssignableFrom(configuration.ActivationType.GetTypeInfo()) ||
activationType.IsConstructedGenericType && activationType.GetGenericTypeDefinition() == configuration.ActivationType))
{
var decorator = request.PopDecoratorPathNode();
return(ProcessPathNode(scope, request, activationType, decorator));
}
}
if (request.ActivationType == typeof(IInjectionScope))
{
if (!scope.ScopeConfiguration.Behaviors.AllowInjectionScopeLocation)
{
throw new ImportInjectionScopeException(request.GetStaticInjectionContext());
}
request.RequireExportScope();
var method = typeof(IExportLocatorScopeExtensions).GetRuntimeMethod(nameof(IExportLocatorScopeExtensions.GetInjectionScope), new[] { typeof(IExportLocatorScope) });
var expression = Expression.Call(method, request.ScopeParameter);
return(request.Services.Compiler.CreateNewResult(request, expression));
}
if (request.ActivationType == typeof(IExportLocatorScope) ||
request.ActivationType == typeof(ILocatorService))
{
request.RequireExportScope();
return(request.Services.Compiler.CreateNewResult(request, request.ScopeParameter));
}
if (request.ActivationType == typeof(IDisposalScope) ||
(request.ActivationType == typeof(IDisposable) &&
request.RequestingScope.ScopeConfiguration.InjectIDisposable))
{
request.RequireDisposalScope();
return(request.Services.Compiler.CreateNewResult(request, request.DisposalScopeExpression));
}
if (request.ActivationType == typeof(IInjectionContext))
{
request.RequireInjectionContext();
return(request.Services.Compiler.CreateNewResult(request, request.InjectionContextParameter));
}
if (request.ActivationType == typeof(StaticInjectionContext))
{
var staticContext = request.Parent != null?
request.Parent.GetStaticInjectionContext() :
request.GetStaticInjectionContext();
return(request.Services.Compiler.CreateNewResult(request, Expression.Constant(staticContext)));
}
if (request.IsDynamic)
{
var dynamicMethod =
typeof(ActivationExpressionBuilder).GetRuntimeMethod(nameof(GetDynamicValue),
new[]
{
typeof(IExportLocatorScope),
typeof(IDisposalScope),
typeof(StaticInjectionContext),
typeof(IInjectionContext),
typeof(object),
typeof(bool),
typeof(bool),
typeof(object)
});
var closedMethod = dynamicMethod.MakeGenericMethod(request.ActivationType);
Expression defaultExpression =
Expression.Constant(request.DefaultValue?.DefaultValue, typeof(object));
request.RequireExportScope();
request.RequireDisposalScope();
request.RequireInjectionContext();
var expression = Expression.Call(closedMethod,
request.ScopeParameter,
request.DisposalScopeExpression,
Expression.Constant(request.GetStaticInjectionContext()),
request.InjectionContextParameter,
Expression.Constant(request.LocateKey, typeof(object)),
Expression.Constant(request.IsRequired),
Expression.Constant(request.DefaultValue != null),
defaultExpression);
return(request.Services.Compiler.CreateNewResult(request, expression));
}
return(null);
}
