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);
}
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);
}
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);
}