private static Expression CreateThrowWithContext(DynamicBuildPlanGenerationContext buildContext, MethodInfo throwMethod)
{
return(Expression.Call(
null,
throwMethod,
buildContext.ContextParameter));
}
/// <summary>
/// Called during the chain of responsibility for a build operation. The
/// PreBuildUp method is called when the chain is being executed in the
/// forward direction.
/// </summary>
/// <param name="context">Context of the build operation.</param>
// FxCop suppression: Validation is done by Guard class
public override void PreBuildUp(IBuilderContext context)
{
DynamicBuildPlanGenerationContext ilContext = (DynamicBuildPlanGenerationContext)(context.Existing);
IMethodSelectorPolicy selector = context.Policies.Get <IMethodSelectorPolicy>(context.BuildKey);
foreach (SelectedMethod method in selector.SelectMethods(context))
{
GuardMethodIsNotOpenGeneric(method.Method);
GuardMethodHasNoOutParams(method.Method);
GuardMethodHasNoRefParams(method.Method);
ParameterInfo[] parameters = method.Method.GetParameters();
ilContext.EmitLoadExisting();
int i = 0;
foreach (string key in method.GetParameterKeys())
{
ilContext.EmitResolveDependency(parameters[i].ParameterType, key);
++i;
}
ilContext.IL.EmitCall(OpCodes.Callvirt, method.Method, null);
if (method.Method.ReturnType != typeof(void))
{
ilContext.IL.Emit(OpCodes.Pop);
}
}
}
/// <summary>
/// Called during the chain of responsibility for a build operation.
/// </summary>
/// <param name="context">The context for the operation.</param>
public override void PreBuildUp(IBuilderContext context)
{
DynamicBuildPlanGenerationContext ilContext = (DynamicBuildPlanGenerationContext)(context.Existing);
IPropertySelectorPolicy selector = context.Policies.Get <IPropertySelectorPolicy>(context.BuildKey);
foreach (SelectedProperty property in selector.SelectProperties(context))
{
// Set the current operation to resolving
ilContext.IL.Emit(OpCodes.Ldstr, property.Property.Name);
ilContext.EmitLoadContext();
ilContext.IL.EmitCall(OpCodes.Call, setCurrentOperationToResolvingPropertyValue, null);
// Resolve the property value
ilContext.EmitLoadExisting();
ilContext.EmitResolveDependency(property.Property.PropertyType, property.Key);
// Set the current operation to setting
ilContext.IL.Emit(OpCodes.Ldstr, property.Property.Name);
ilContext.EmitLoadContext();
ilContext.IL.EmitCall(OpCodes.Call, setCurrentOperationToSettingProperty, null);
// Call the property setter
ilContext.IL.EmitCall(OpCodes.Callvirt, property.Property.GetSetMethod(), null);
}
// Clear the current operation
ilContext.EmitClearCurrentOperation();
}
/// <summary>
/// Called during the chain of responsibility for a build operation. The
/// PreBuildUp method is called when the chain is being executed in the
/// forward direction.
/// </summary>
/// <param name="context">Context of the build operation.</param>
// FxCop suppression: Validation is done by Guard class
public override void PreBuildUp(IBuilderContext context)
{
DynamicBuildPlanGenerationContext ilContext = (DynamicBuildPlanGenerationContext)(context.Existing);
IMethodSelectorPolicy selector = context.Policies.Get <IMethodSelectorPolicy>(context.BuildKey);
LocalBuilder currentMethodName = ilContext.IL.DeclareLocal(typeof(string));
LocalBuilder currentParameterName = ilContext.IL.DeclareLocal(typeof(string));
ilContext.IL.BeginExceptionBlock();
foreach (SelectedMethod method in selector.SelectMethods(context))
{
ilContext.IL.Emit(OpCodes.Ldstr, GetMethodSignature(method.Method));
ilContext.IL.Emit(OpCodes.Stloc, currentMethodName);
ilContext.IL.Emit(OpCodes.Ldnull);
ilContext.IL.Emit(OpCodes.Stloc, currentParameterName);
GuardMethodIsNotOpenGeneric(method.Method);
GuardMethodHasNoOutParams(method.Method);
GuardMethodHasNoRefParams(method.Method);
ParameterInfo[] parameters = method.Method.GetParameters();
ilContext.EmitLoadExisting();
int i = 0;
foreach (string key in method.GetParameterKeys())
{
ilContext.IL.Emit(OpCodes.Ldstr, parameters[i].Name);
ilContext.IL.Emit(OpCodes.Stloc, currentParameterName);
ilContext.EmitResolveDependency(parameters[i].ParameterType, key);
++i;
}
ilContext.IL.Emit(OpCodes.Ldnull);
ilContext.IL.Emit(OpCodes.Stloc, currentParameterName);
ilContext.IL.EmitCall(OpCodes.Callvirt, method.Method, null);
if (method.Method.ReturnType != typeof(void))
{
ilContext.IL.Emit(OpCodes.Pop);
}
}
ilContext.IL.BeginCatchBlock(typeof(Exception));
Label parameterResolveFailed = ilContext.IL.DefineLabel();
ilContext.IL.Emit(OpCodes.Ldloc, currentParameterName);
ilContext.IL.Emit(OpCodes.Brtrue, parameterResolveFailed);
// Failure was in the method call.
ilContext.IL.Emit(OpCodes.Rethrow);
ilContext.IL.MarkLabel(parameterResolveFailed);
ilContext.IL.Emit(OpCodes.Ldloc, currentMethodName);
ilContext.IL.Emit(OpCodes.Ldloc, currentParameterName);
ilContext.IL.EmitCall(OpCodes.Call, throwOnParameterResolveFailed, null);
ilContext.IL.EndExceptionBlock();
}
private IBuilderContext GetContext(IBuilderContext originalContext, NamedTypeBuildKey buildKey, DynamicBuildPlanGenerationContext ilContext)
{
return new BuilderContext(
strategies.MakeStrategyChain(),
originalContext.Lifetime,
originalContext.PersistentPolicies,
originalContext.Policies,
buildKey,
ilContext);
}
public IBuildPlanPolicy CreatePlan(IBuilderContext context, NamedTypeBuildKey buildKey)
{
Guard.ArgumentNotNull(buildKey, "buildKey");
DynamicBuildPlanGenerationContext generatorContext =
new DynamicBuildPlanGenerationContext(buildKey.Type);
IBuilderContext planContext = GetContext(context, buildKey, generatorContext);
planContext.Strategies.ExecuteBuildUp(planContext);
return new DynamicMethodBuildPlan(generatorContext.GetBuildMethod());
}
public IBuildPlanPolicy CreatePlan(IBuilderContext context, NamedTypeBuildKey buildKey)
{
Guard.ArgumentNotNull(buildKey, "buildKey");
DynamicBuildPlanGenerationContext generatorContext =
new DynamicBuildPlanGenerationContext(buildKey.Type);
IBuilderContext planContext = GetContext(context, buildKey, generatorContext);
planContext.Strategies.ExecuteBuildUp(planContext);
return(new DynamicMethodBuildPlan(generatorContext.GetBuildMethod()));
}
/// <summary>
/// Called during the chain of responsibility for a build operation.
/// </summary>
/// <param name="context">The context for the operation.</param>
public override void PreBuildUp(IBuilderContext context)
{
DynamicBuildPlanGenerationContext ilContext = (DynamicBuildPlanGenerationContext)(context.Existing);
IPropertySelectorPolicy selector = context.Policies.Get <IPropertySelectorPolicy>(context.BuildKey);
foreach (SelectedProperty property in selector.SelectProperties(context))
{
ilContext.EmitLoadExisting();
ilContext.EmitResolveDependency(property.Property.PropertyType, property.Key);
ilContext.IL.EmitCall(OpCodes.Callvirt, property.Property.GetSetMethod(), null);
}
}
/// <summary>
/// Construct a build plan.
/// </summary>
/// <param name="context">The current build context.</param>
/// <param name="buildKey">The current build key.</param>
/// <returns>The created build plan.</returns>
public IBuildPlanPolicy CreatePlan(IBuilderContext context, object buildKey)
{
IDynamicBuilderMethodCreatorPolicy methodCreatorPolicy =
context.Policies.Get <IDynamicBuilderMethodCreatorPolicy>(context.BuildKey);
DynamicBuildPlanGenerationContext generatorContext =
new DynamicBuildPlanGenerationContext(
BuildKey.GetType(buildKey), methodCreatorPolicy);
IBuilderContext planContext = GetContext(context, buildKey, generatorContext);
planContext.Strategies.ExecuteBuildUp(planContext);
return(new DynamicMethodBuildPlan(generatorContext.GetBuildMethod()));
}
public override void PreBuildUp(IBuilderContext context)
{
Guard.ArgumentNotNull(context, "context");
DynamicBuildPlanGenerationContext buildContext =
(DynamicBuildPlanGenerationContext)context.Existing;
IConstructorSelectorPolicy selector =
context.Policies.Get <IConstructorSelectorPolicy>(context.BuildKey);
SelectedConstructor selectedCtor = selector.SelectConstructor(context);
// Method preamble - test if we have an existing object
// First off, set up jump - if there's an existing object, skip us entirely
Label existingObjectNotNull = buildContext.IL.DefineLabel();
buildContext.EmitLoadExisting();
buildContext.IL.Emit(OpCodes.Ldnull);
buildContext.IL.Emit(OpCodes.Ceq);
buildContext.IL.Emit(OpCodes.Brfalse, existingObjectNotNull);
if (selectedCtor != null)
{
// Resolve parameters
ParameterInfo[] parameters = selectedCtor.Constructor.GetParameters();
int i = 0;
foreach (string parameterKey in selectedCtor.GetParameterKeys())
{
buildContext.EmitResolveDependency(parameters[i].ParameterType, parameterKey);
++i;
}
// Call the constructor
buildContext.IL.Emit(OpCodes.Newobj, selectedCtor.Constructor);
buildContext.EmitStoreExisting();
}
else
{
// If we get here, object has no constructors. It's either
// an interface or a primitive (like int). In this case,
// verify that we have an Existing object, and if not,
// throw (via helper function).
buildContext.EmitLoadContext();
buildContext.IL.EmitCall(OpCodes.Call, throwForNullExistingObject, null);
}
buildContext.IL.MarkLabel(existingObjectNotNull);
}
internal Expression CreateInstanceBuildupExpression(DynamicBuildPlanGenerationContext buildContext, IBuilderContext context)
{
var targetTypeInfo = context.BuildKey.Type.GetTypeInfo();
if (targetTypeInfo.IsInterface)
{
return(CreateThrowWithContext(buildContext, ThrowForAttemptingToConstructInterfaceMethod));
}
if (targetTypeInfo.IsAbstract)
{
return(CreateThrowWithContext(buildContext, ThrowForAttemptingToConstructAbstractClassMethod));
}
if (targetTypeInfo.IsSubclassOf(typeof(Delegate)))
{
return(CreateThrowWithContext(buildContext, ThrowForAttemptingToConstructDelegateMethod));
}
IPolicyList resolverPolicyDestination;
IConstructorSelectorPolicy selector =
context.Policies.Get <IConstructorSelectorPolicy>(context.BuildKey, out resolverPolicyDestination);
SelectedConstructor selectedConstructor = selector.SelectConstructor(context, resolverPolicyDestination);
if (selectedConstructor == null)
{
return(CreateThrowWithContext(buildContext, ThrowForNullExistingObjectMethod));
}
string signature = DynamicMethodConstructorStrategy.CreateSignatureString(selectedConstructor.Constructor);
if (IsInvalidConstructor(selectedConstructor))
{
return(CreateThrowForNullExistingObjectWithInvalidConstructor(buildContext, signature));
}
// psuedo-code:
// throw if attempting interface
// if (context.Existing == null) {
// collect parameters
// set operation to invoking constructor
// context.Existing = new {objectType}({constructorparameter}...)
// clear current operation
// }
return(Expression.Block(this.CreateNewBuildupSequence(buildContext, selectedConstructor, signature)));
}
/// <summary>
/// Called during the chain of responsibility for a build operation. The
/// PreBuildUp method is called when the chain is being executed in the
/// forward direction.
/// </summary>
/// <param name="context">Context of the build operation.</param>
// FxCop suppression: Validation is done by Guard class
public override void PreBuildUp(IBuilderContext context)
{
DynamicBuildPlanGenerationContext ilContext = (DynamicBuildPlanGenerationContext)(context.Existing);
IMethodSelectorPolicy selector = context.Policies.Get <IMethodSelectorPolicy>(context.BuildKey);
foreach (SelectedMethod method in selector.SelectMethods(context))
{
string signatureString = GetMethodSignature(method.Method);
GuardMethodIsNotOpenGeneric(method.Method);
GuardMethodHasNoOutParams(method.Method);
GuardMethodHasNoRefParams(method.Method);
ParameterInfo[] parameters = method.Method.GetParameters();
ilContext.EmitLoadExisting();
int i = 0;
foreach (string key in method.GetParameterKeys())
{
// Set the current operation
ilContext.IL.Emit(OpCodes.Ldstr, parameters[i].Name);
ilContext.IL.Emit(OpCodes.Ldstr, signatureString);
ilContext.EmitLoadContext();
ilContext.IL.EmitCall(OpCodes.Call, setCurrentOperationToResolvingParameter, null);
// Resolve the parameter
ilContext.EmitResolveDependency(parameters[i].ParameterType, key);
++i;
}
// Set the current operation
ilContext.IL.Emit(OpCodes.Ldstr, signatureString);
ilContext.EmitLoadContext();
ilContext.IL.EmitCall(OpCodes.Call, setCurrentOperationToInvokingMethod, null);
// Invoke the injection method
ilContext.IL.EmitCall(OpCodes.Callvirt, method.Method, null);
if (method.Method.ReturnType != typeof(void))
{
ilContext.IL.Emit(OpCodes.Pop);
}
}
// Clear the current operation
ilContext.EmitClearCurrentOperation();
}
private IEnumerable <Expression> CreateNewBuildupSequence(DynamicBuildPlanGenerationContext buildContext, SelectedConstructor selectedConstructor, string signature)
{
var parameterExpressions = this.BuildConstructionParameterExpressions(buildContext, selectedConstructor, signature);
var newItemExpression = Expression.Variable(selectedConstructor.Constructor.DeclaringType, "newItem");
yield return(Expression.Call(null,
SetCurrentOperationToInvokingConstructorMethod,
Expression.Constant(signature),
buildContext.ContextParameter));
yield return(Expression.Assign(
buildContext.GetExistingObjectExpression(),
Expression.Convert(
Expression.New(selectedConstructor.Constructor, parameterExpressions),
typeof(object))));
yield return(buildContext.GetClearCurrentOperationExpression());
}
public override void PreBuildUp(IBuilderContext context)
{
Guard.ArgumentNotNull(context, "context");
DynamicBuildPlanGenerationContext buildContext =
(DynamicBuildPlanGenerationContext)context.Existing;
GuardTypeIsNonPrimitive(context);
buildContext.AddToBuildPlan(
Expression.IfThen(
Expression.Equal(
buildContext.GetExistingObjectExpression(),
Expression.Constant(null)),
this.CreateInstanceBuildupExpression(buildContext, context)));
buildContext.AddToBuildPlan(
Expression.Call(null, SetPerBuildSingletonMethod, buildContext.ContextParameter));
}
private IEnumerable <Expression> BuildMethodParameterExpressions(DynamicBuildPlanGenerationContext context, SelectedMethod method, string methodSignature)
{
int i = 0;
var methodParameters = method.Method.GetParameters();
foreach (IDependencyResolverPolicy parameterResolver in method.GetParameterResolvers())
{
yield return(context.CreateParameterExpression(
parameterResolver,
methodParameters[i].ParameterType,
Expression.Call(null,
SetCurrentOperationToResolvingParameterMethod,
Expression.Constant(methodParameters[i].Name, typeof(string)),
Expression.Constant(methodSignature),
context.ContextParameter)));
i++;
}
}
private IEnumerable <Expression> BuildConstructionParameterExpressions(DynamicBuildPlanGenerationContext buildContext, SelectedConstructor selectedConstructor, string constructorSignature)
{
int i = 0;
var constructionParameters = selectedConstructor.Constructor.GetParameters();
foreach (IDependencyResolverPolicy parameterResolver in selectedConstructor.GetParameterResolvers())
{
yield return(buildContext.CreateParameterExpression(
parameterResolver,
constructionParameters[i].ParameterType,
Expression.Call(null,
SetCurrentOperationToResolvingParameterMethod,
Expression.Constant(constructionParameters[i].Name, typeof(string)),
Expression.Constant(constructorSignature),
buildContext.ContextParameter)));
i++;
}
}
/// <summary>
/// Called during the chain of responsibility for a build operation.
/// </summary>
/// <param name="context">The context for the operation.</param>
public override void PreBuildUp(IBuilderContext context)
{
DynamicBuildPlanGenerationContext ilContext = (DynamicBuildPlanGenerationContext)(context.Existing);
IPropertySelectorPolicy selector = context.Policies.Get <IPropertySelectorPolicy>(context.BuildKey);
LocalBuilder resolving = ilContext.IL.DeclareLocal(typeof(bool));
LocalBuilder currentPropertyName = ilContext.IL.DeclareLocal(typeof(string));
ilContext.IL.BeginExceptionBlock();
foreach (SelectedProperty property in selector.SelectProperties(context))
{
// Resolve the property value
ilContext.IL.Emit(OpCodes.Ldstr, property.Property.Name);
ilContext.IL.Emit(OpCodes.Stloc, currentPropertyName);
ilContext.IL.Emit(OpCodes.Ldc_I4_1);
ilContext.IL.Emit(OpCodes.Stloc, resolving);
ilContext.EmitLoadExisting();
ilContext.EmitResolveDependency(property.Property.PropertyType, property.Key);
// Call the property setter
ilContext.IL.Emit(OpCodes.Ldc_I4_0);
ilContext.IL.Emit(OpCodes.Stloc, resolving);
ilContext.IL.EmitCall(OpCodes.Callvirt, property.Property.GetSetMethod(), null);
}
// Catch any exceptions in the setting of the properties
ilContext.IL.BeginCatchBlock(typeof(Exception));
Label failedWhileResolving = ilContext.IL.DefineLabel();
ilContext.IL.Emit(OpCodes.Ldloc, resolving);
ilContext.IL.Emit(OpCodes.Brtrue, failedWhileResolving);
ilContext.IL.Emit(OpCodes.Rethrow);
ilContext.IL.MarkLabel(failedWhileResolving);
ilContext.IL.Emit(OpCodes.Ldloc, currentPropertyName);
ilContext.IL.EmitCall(OpCodes.Call, throwOnFailedPropertyValueResolution, null);
ilContext.IL.EndExceptionBlock();
}
/// <summary>
/// Called during the chain of responsibility for a build operation.
/// </summary>
/// <param name="context">The context for the operation.</param>
public override void PreBuildUp(IBuilderContext context)
{
Guard.ArgumentNotNull(context, "context");
DynamicBuildPlanGenerationContext ilContext = (DynamicBuildPlanGenerationContext)(context.Existing);
IPolicyList resolverPolicyDestination;
IPropertySelectorPolicy selector = context.Policies.Get <IPropertySelectorPolicy>(context.BuildKey, out resolverPolicyDestination);
bool shouldClearOperation = false;
foreach (SelectedProperty property in selector.SelectProperties(context, resolverPolicyDestination))
{
shouldClearOperation = true;
// Set the current operation to resolving
ilContext.IL.Emit(OpCodes.Ldstr, property.Property.Name);
ilContext.EmitLoadContext();
ilContext.IL.EmitCall(OpCodes.Call, setCurrentOperationToResolvingPropertyValue, null);
// Resolve the property value
ilContext.EmitLoadExisting();
ilContext.EmitResolveDependency(property.Property.PropertyType, property.Key);
// Set the current operation to setting
ilContext.IL.Emit(OpCodes.Ldstr, property.Property.Name);
ilContext.EmitLoadContext();
ilContext.IL.EmitCall(OpCodes.Call, setCurrentOperationToSettingProperty, null);
// Call the property setter
ilContext.IL.EmitCall(OpCodes.Callvirt, GetValidatedPropertySetter(property.Property), null);
}
// Clear the current operation
if (shouldClearOperation)
{
ilContext.EmitClearCurrentOperation();
}
}
private IEnumerable<Expression> CreateThrowForNullExistingObjectWithInvalidConstructorSequence(DynamicBuildPlanGenerationContext buildContext, string signature)
{
yield return Expression.Call(
null,
throwForNullExistingObjectWithInvalidConstructor,
buildContext.ContextParameter,
Expression.Constant(signature, typeof(string)));
}
internal Expression CreateInstanceBuildupExpression(DynamicBuildPlanGenerationContext buildContext, IBuilderContext context)
{
var targetTypeInfo = context.BuildKey.Type.GetTypeInfo();
if (targetTypeInfo.IsInterface)
{
return CreateThrowWithContext(buildContext, ThrowForAttemptingToConstructInterfaceMethod);
}
if (targetTypeInfo.IsAbstract)
{
return CreateThrowWithContext(buildContext, ThrowForAttemptingToConstructAbstractClassMethod);
}
if (targetTypeInfo.IsSubclassOf(typeof(Delegate)))
{
return CreateThrowWithContext(buildContext, ThrowForAttemptingToConstructDelegateMethod);
}
IPolicyList resolverPolicyDestination;
IConstructorSelectorPolicy selector =
context.Policies.Get<IConstructorSelectorPolicy>(context.BuildKey, out resolverPolicyDestination);
SelectedConstructor selectedConstructor = selector.SelectConstructor(context, resolverPolicyDestination);
if (selectedConstructor == null)
{
return CreateThrowWithContext(buildContext, ThrowForNullExistingObjectMethod);
}
string signature = DynamicMethodConstructorStrategy.CreateSignatureString(selectedConstructor.Constructor);
if (IsInvalidConstructor(selectedConstructor))
{
return CreateThrowForNullExistingObjectWithInvalidConstructor(buildContext, signature);
}
// psuedo-code:
// throw if attempting interface
// if (context.Existing == null) {
// collect parameters
// set operation to invoking constructor
// context.Existing = new {objectType}({constructorparameter}...)
// clear current operation
// }
return Expression.Block(this.CreateNewBuildupSequence(buildContext, selectedConstructor, signature));
}
private IEnumerable<Expression> BuildConstructionParameterExpressions(DynamicBuildPlanGenerationContext buildContext, SelectedConstructor selectedConstructor, string constructorSignature)
{
int i = 0;
var constructionParameters = selectedConstructor.Constructor.GetParameters();
foreach (string parameterKey in selectedConstructor.GetParameterKeys())
{
yield return buildContext.CreateParameterExpression(
parameterKey,
constructionParameters[i].ParameterType,
Expression.Call(null,
setCurrentOperationToResolvingParameter,
Expression.Constant(constructionParameters[i].Name, typeof(string)),
Expression.Constant(constructorSignature),
buildContext.ContextParameter
)
);
i++;
}
}
private IEnumerable<Expression> CreateNewBuildupSequence(DynamicBuildPlanGenerationContext buildContext, SelectedConstructor selectedConstructor, string signature)
{
var parameterExpressions = BuildConstructionParameterExpressions(buildContext, selectedConstructor, signature);
var newItemExpression = Expression.Variable(selectedConstructor.Constructor.DeclaringType, "newItem");
yield return Expression.Call(null,
setCurrentOperationToInvokingConstructor,
Expression.Constant(signature),
buildContext.ContextParameter
);
yield return Expression.Assign(
buildContext.GetExistingObjectExpression(),
Expression.Convert(
Expression.New(selectedConstructor.Constructor, parameterExpressions),
typeof(object)));
yield return buildContext.GetClearCurrentOperationExpression();
}
private IBuilderContext GetContext(IBuilderContext originalContext, NamedTypeBuildKey buildKey, DynamicBuildPlanGenerationContext generatorContext)
{
return(new BuilderContext(
strategies.MakeStrategyChain(),
originalContext.Lifetime,
originalContext.PersistentPolicies,
originalContext.Policies,
buildKey,
generatorContext));
}
internal Expression CreateInstanceBuildupExpression(DynamicBuildPlanGenerationContext buildContext, SelectedConstructor selectedConstructor)
{
IEnumerable<Expression> buildupSequence;
string signature = CreateSignatureString(selectedConstructor.Constructor);
buildupSequence = IsInvalidConstructor(selectedConstructor)?
CreateThrowForNullExistingObjectWithInvalidConstructorSequence(buildContext, signature) :
CreateNewBuildupSequence(buildContext, selectedConstructor, signature);
// psuedo-code:
// throw if attempting interface
// if (context.Existing == null) {
// collect parameters
// set operation to invoking constructor
// context.Existing = new {objectType}({constructorparameter}...)
// clear current operation
// }
return
Expression.Block(
Expression.Call(null, throwForAttemptingToConstructInterface, buildContext.ContextParameter),
Expression.Block(buildupSequence));
}
public override void PreBuildUp(IBuilderContext context)
{
Guard.ArgumentNotNull(context, "context");
DynamicBuildPlanGenerationContext buildContext =
(DynamicBuildPlanGenerationContext)context.Existing;
IPolicyList resolverPolicyDestination;
IConstructorSelectorPolicy selector =
context.Policies.Get <IConstructorSelectorPolicy>(context.BuildKey, out resolverPolicyDestination);
SelectedConstructor selectedCtor = selector.SelectConstructor(context, resolverPolicyDestination);
GuardTypeIsNonPrimitive(context, selectedCtor);
// Method preamble - test if we have an existing object
// First off, set up jump - if there's an existing object, skip us entirely
Label existingObjectNotNull = buildContext.IL.DefineLabel();
if (!buildContext.TypeToBuild.IsValueType)
{
buildContext.EmitLoadExisting();
buildContext.IL.Emit(OpCodes.Brtrue, existingObjectNotNull);
}
// Verify we're not attempting to create an instance of an interface
buildContext.EmitLoadContext();
buildContext.IL.EmitCall(OpCodes.Call, throwForAttemptingToConstructInterface, null);
if (selectedCtor != null)
{
string signatureString = CreateSignatureString(selectedCtor.Constructor);
// Resolve parameters
ParameterInfo[] parameters = selectedCtor.Constructor.GetParameters();
if (!parameters.Any(pi => pi.ParameterType.IsByRef))
{
int i = 0;
foreach (string parameterKey in selectedCtor.GetParameterKeys())
{
// Set the current operation
buildContext.IL.Emit(OpCodes.Ldstr, parameters[i].Name);
buildContext.IL.Emit(OpCodes.Ldstr, signatureString);
buildContext.EmitLoadContext();
buildContext.IL.EmitCall(OpCodes.Call, setCurrentOperationToResolvingParameter, null);
// Resolve the parameter
buildContext.EmitResolveDependency(parameters[i].ParameterType, parameterKey);
++i;
}
// Set the current operation
buildContext.IL.Emit(OpCodes.Ldstr, signatureString);
buildContext.EmitLoadContext();
buildContext.IL.EmitCall(OpCodes.Call, setCurrentOperationToInvokingConstructor, null);
// Call the constructor
buildContext.IL.Emit(OpCodes.Newobj, selectedCtor.Constructor);
// Store the existing object
buildContext.EmitStoreExisting();
// Clear the current operation
buildContext.EmitClearCurrentOperation();
// Store existing object back into context - makes it available for future resolvers
buildContext.EmitLoadContext();
buildContext.EmitLoadExisting();
if (buildContext.TypeToBuild.IsValueType)
{
buildContext.IL.Emit(OpCodes.Box, buildContext.TypeToBuild);
}
buildContext.IL.EmitCall(OpCodes.Callvirt, setExistingInContext, null);
// Is this object a per-build singleton? If so, then emit code to stuff in
// the appropriate lifetime manager.
buildContext.EmitLoadContext();
buildContext.IL.EmitCall(OpCodes.Call, setPerBuildSingleton, null);
}
else
{
// if we get here the selected constructor has ref or out parameters.
buildContext.EmitLoadContext();
buildContext.IL.Emit(OpCodes.Ldstr, signatureString);
buildContext.IL.EmitCall(OpCodes.Call, throwForNullExistingObjectWithInvalidConstructor, null);
}
}
else
{
// If we get here, object has no constructors. It's either
// an interface or a primitive (like int). In this case,
// verify that we have an Existing object, and if not,
// throw (via helper function).
buildContext.EmitLoadContext();
buildContext.IL.EmitCall(OpCodes.Call, throwForNullExistingObject, null);
}
buildContext.IL.MarkLabel(existingObjectNotNull);
}
private static Expression CreateThrowForNullExistingObjectWithInvalidConstructor(DynamicBuildPlanGenerationContext buildContext, string signature)
{
return(Expression.Call(
null,
ThrowForNullExistingObjectWithInvalidConstructorMethod,
buildContext.ContextParameter,
Expression.Constant(signature, typeof(string))));
}
public override void PreBuildUp(IBuilderContext context)
{
Guard.ArgumentNotNull(context, "context");
DynamicBuildPlanGenerationContext buildContext =
(DynamicBuildPlanGenerationContext)context.Existing;
IConstructorSelectorPolicy selector =
context.Policies.Get <IConstructorSelectorPolicy>(context.BuildKey);
SelectedConstructor selectedCtor = selector.SelectConstructor(context);
// Method preamble - test if we have an existing object
// First off, set up jump - if there's an existing object, skip us entirely
Label existingObjectNotNull = buildContext.IL.DefineLabel();
buildContext.EmitLoadExisting();
buildContext.IL.Emit(OpCodes.Ldnull);
buildContext.IL.Emit(OpCodes.Ceq);
buildContext.IL.Emit(OpCodes.Brfalse, existingObjectNotNull);
// Verify we're not attempting to create an instance of an interface
buildContext.EmitLoadContext();
buildContext.IL.EmitCall(OpCodes.Call, throwForAttemptingToConstructInterface, null);
if (selectedCtor != null)
{
string signatureString = CreateSignatureString(selectedCtor.Constructor);
LocalBuilder currentParameterName = buildContext.IL.DeclareLocal(typeof(string));
// Resolve parameters
ParameterInfo[] parameters = selectedCtor.Constructor.GetParameters();
buildContext.IL.BeginExceptionBlock();
int i = 0;
foreach (string parameterKey in selectedCtor.GetParameterKeys())
{
buildContext.IL.Emit(OpCodes.Ldstr, parameters[i].Name);
buildContext.IL.Emit(OpCodes.Stloc, currentParameterName);
buildContext.EmitResolveDependency(parameters[i].ParameterType, parameterKey);
++i;
}
// Call the constructor
buildContext.IL.Emit(OpCodes.Ldnull);
buildContext.IL.Emit(OpCodes.Stloc, currentParameterName);
buildContext.IL.Emit(OpCodes.Newobj, selectedCtor.Constructor);
buildContext.EmitStoreExisting();
buildContext.IL.BeginCatchBlock(typeof(Exception));
Label exceptionOccuredInResolution = buildContext.IL.DefineLabel();
buildContext.IL.Emit(OpCodes.Ldloc, currentParameterName);
buildContext.IL.Emit(OpCodes.Ldnull);
buildContext.IL.Emit(OpCodes.Ceq);
buildContext.IL.Emit(OpCodes.Brfalse, exceptionOccuredInResolution);
buildContext.IL.Emit(OpCodes.Rethrow);
buildContext.IL.MarkLabel(exceptionOccuredInResolution);
buildContext.IL.Emit(OpCodes.Ldloc, currentParameterName);
buildContext.IL.Emit(OpCodes.Ldstr, signatureString);
buildContext.EmitLoadContext();
buildContext.IL.EmitCall(OpCodes.Call, throwForResolutionFailed, null);
buildContext.IL.EndExceptionBlock();
}
else
{
// If we get here, object has no constructors. It's either
// an interface or a primitive (like int). In this case,
// verify that we have an Existing object, and if not,
// throw (via helper function).
buildContext.EmitLoadContext();
buildContext.IL.EmitCall(OpCodes.Call, throwForNullExistingObject, null);
}
buildContext.IL.MarkLabel(existingObjectNotNull);
}
private static Expression CreateThrowForNullExistingObjectWithInvalidConstructor(DynamicBuildPlanGenerationContext buildContext, string signature)
{
return Expression.Call(
null,
ThrowForNullExistingObjectWithInvalidConstructorMethod,
buildContext.ContextParameter,
Expression.Constant(signature, typeof(string)));
}
private IEnumerable<Expression> BuildMethodParameterExpressions(DynamicBuildPlanGenerationContext context, SelectedMethod method, string methodSignature)
{
int i = 0;
var methodParameters = method.Method.GetParameters();
foreach (string parameterKey in method.GetParameterKeys())
{
yield return context.CreateParameterExpression(
parameterKey,
methodParameters[i].ParameterType,
Expression.Call(null,
setCurrentOperationToResolvingParameter,
Expression.Constant(methodParameters[i].Name, typeof(string)),
Expression.Constant(methodSignature),
context.ContextParameter));
i++;
}
}
private IBuilderContext GetContext(IBuilderContext originalContext, object buildKey, DynamicBuildPlanGenerationContext ilContext)
{
return(new BuilderContext(
strategies.MakeStrategyChain(),
originalContext.Locator,
originalContext.Lifetime,
originalContext.PersistentPolicies,
originalContext.Policies,
buildKey,
ilContext));
}
private static Expression CreateThrowWithContext(DynamicBuildPlanGenerationContext buildContext, MethodInfo throwMethod)
{
return Expression.Call(
null,
throwMethod,
buildContext.ContextParameter);
}