public CreationResult TryResolveDummyValue(Type typeOfDummy, LoopDetectingResolutionContext resolutionContext)
{
// Make sure we're not already resolving typeOfDummy. It may seem that we could skip this check when we have
// a cached resolution strategy in strategyCache, but it's necessary in case multiple threads are involved and
// typeOfDummy has a constructor that takes typeOfDummy as a parameter.
// In that situation, perhaps this thread starts trying to resolve a Dummy using the constructor that takes a
// typeOfDummy. Meanwhile another thread does the same thing, but gets more processing time and eventually fails to
// use that constructor, but then it succeeds in making a typeOfDummy using a different constructor. Then the strategy
// is cached. This thread sees the cached strategy, creates a typeOfDummy for the constructor parameter, and then
// uses it to make the "outer" typeOfDummy. Then we'd have Dummies created via two different constructors, which
// might have different behavior. This is essentially the problem that arose in issue 1639.
if (!resolutionContext.TryBeginToResolve(typeOfDummy))
{
return(CreationResult.FailedToCreateDummy(typeOfDummy, "Recursive dependency detected. Already resolving " + typeOfDummy + '.'));
}
try
{
return(this.strategyCache.TryGetValue(typeOfDummy, out ResolveStrategy cachedStrategy)
? cachedStrategy.TryCreateDummyValue(typeOfDummy, this, resolutionContext)
: this.TryResolveDummyValueWithAllAvailableStrategies(typeOfDummy, resolutionContext));
}
finally
{
resolutionContext.EndResolve(typeOfDummy);
}
}
public override CreationResult TryCreateDummyValue(Type typeOfDummy, IDummyValueResolver resolver)
{
var success = this.DummyFactory.TryCreateDummyObject(typeOfDummy, out object result);
return(success
? CreationResult.SuccessfullyCreated(result)
: CreationResult.FailedToCreateDummy(typeOfDummy, "No Dummy Factory produced a result."));
}
public override CreationResult TryCreateDummyValue(DummyCreationSession session, Type typeOfDummy)
{
if (typeof(Delegate).IsAssignableFrom(typeOfDummy))
{
return(CreationResult.FailedToCreateDummy(typeOfDummy, "It is a Delegate."));
}
if (typeOfDummy.GetTypeInfo().IsAbstract)
{
return(CreationResult.FailedToCreateDummy(typeOfDummy, "It is abstract."));
}
// Save the constructors as we try them. Avoids eager evaluation and double evaluation
// of constructors enumerable.
var consideredConstructors = new List <ResolvedConstructor>();
if (this.cachedConstructors.TryGetValue(typeOfDummy, out ConstructorInfo cachedConstructor))
{
var resolvedConstructor = new ResolvedConstructor(
cachedConstructor.GetParameters().Select(pi => pi.ParameterType),
session,
this.Resolver);
if (resolvedConstructor.WasSuccessfullyResolved)
{
if (TryCreateDummyValueUsingConstructor(cachedConstructor, resolvedConstructor, out object result))
{
return(CreationResult.SuccessfullyCreated(result));
}
consideredConstructors.Add(resolvedConstructor);
}
}
else
{
foreach (var constructor in GetConstructorsInOrder(typeOfDummy))
{
var resolvedConstructor = new ResolvedConstructor(
constructor.GetParameters().Select(pi => pi.ParameterType),
session,
this.Resolver);
if (resolvedConstructor.WasSuccessfullyResolved && TryCreateDummyValueUsingConstructor(constructor, resolvedConstructor, out object result))
{
this.cachedConstructors[typeOfDummy] = constructor;
return(CreationResult.SuccessfullyCreated(result));
}
consideredConstructors.Add(resolvedConstructor);
}
}
if (consideredConstructors.Any())
{
return(CreationResult.FailedToCreateDummy(typeOfDummy, consideredConstructors));
}
return(CreationResult.FailedToCreateDummy(typeOfDummy, "It has no public constructors."));
}
public override CreationResult TryCreateDummyValue(Type typeOfDummy, IDummyValueResolver resolver)
{
if (typeOfDummy.GetTypeInfo().IsValueType&& typeOfDummy != typeof(void))
{
return(CreationResult.SuccessfullyCreated(Activator.CreateInstance(typeOfDummy)));
}
return(CreationResult.FailedToCreateDummy(typeOfDummy, "It is not a value type."));
}
public override CreationResult TryCreateDummyValue(
Type typeOfDummy,
IDummyValueResolver resolver,
LoopDetectingResolutionContext resolutionContext)
{
if (typeOfDummy.GetTypeInfo().IsGenericType&& typeOfDummy.GetGenericTypeDefinition() == typeof(Lazy <>))
{
var typeOfLazyResult = typeOfDummy.GetGenericArguments()[0];
var method = CreateLazyDummyGenericDefinition.MakeGenericMethod(typeOfLazyResult);
var dummy = method.Invoke(null, new object[] { resolver });
return(CreationResult.SuccessfullyCreated(dummy));
}
return(CreationResult.FailedToCreateDummy(typeOfDummy, "It is not a Lazy."));
}
public CreationResult TryResolveDummyValue(DummyCreationSession session, Type typeOfDummy)
{
if (!session.TryBeginToResolveType(typeOfDummy))
{
return(CreationResult.FailedToCreateDummy(typeOfDummy, "Recursive dependency detected. Already resolving " + typeOfDummy + '.'));
}
var creationResult = this.TryResolveDummyValueWithAllAvailableStrategies(session, typeOfDummy);
if (creationResult.WasSuccessful)
{
session.OnSuccessfulResolve(typeOfDummy);
}
return(creationResult);
}
public override CreationResult TryCreateDummyValue(
Type typeOfDummy,
IDummyValueResolver resolver,
LoopDetectingResolutionContext resolutionContext)
{
if (typeOfDummy == typeof(Task))
{
return(CreationResult.SuccessfullyCreated(TaskHelper.CompletedTask));
}
if (typeOfDummy.IsGenericType && typeOfDummy.GetGenericTypeDefinition() == typeof(Task <>))
{
var typeOfTaskResult = typeOfDummy.GetGenericArguments()[0];
var creationResult = resolver.TryResolveDummyValue(typeOfTaskResult, resolutionContext);
object?taskResult = creationResult.WasSuccessful
? creationResult.Result
: typeOfTaskResult.GetDefaultValue();
var method = GenericFromResultMethodDefinition.MakeGenericMethod(typeOfTaskResult);
return(CreationResult.SuccessfullyCreated(method.Invoke(null, new[] { taskResult })));
}
if (typeOfDummy.FullName == "System.Threading.Tasks.ValueTask")
{
return(CreationResult.SuccessfullyCreated(typeOfDummy.GetDefaultValue()));
}
if (typeOfDummy.IsGenericType &&
!typeOfDummy.IsGenericTypeDefinition &&
typeOfDummy.FullName is string fullName &&
fullName.StartsWith("System.Threading.Tasks.ValueTask`", StringComparison.Ordinal))
{
var typeOfTaskResult = typeOfDummy.GetGenericArguments()[0];
var creationResult = resolver.TryResolveDummyValue(typeOfTaskResult, resolutionContext);
object?taskResult = creationResult.WasSuccessful
? creationResult.Result
: typeOfTaskResult.GetDefaultValue();
var ctor = typeOfDummy.GetConstructor(new[] { typeOfTaskResult }) !;
return(CreationResult.SuccessfullyCreated(ctor.Invoke(new[] { taskResult })));
}
return(CreationResult.FailedToCreateDummy(typeOfDummy, "It is not a Task."));
}
public override CreationResult TryCreateDummyValue(Type typeOfDummy, IDummyValueResolver resolver)
{
if (typeOfDummy.GetTypeInfo().IsGenericType&& typeOfDummy.GetGenericTypeDefinition() == typeof(Lazy <>))
{
var typeOfLazyResult = typeOfDummy.GetGenericArguments()[0];
var creationResult = resolver.TryResolveDummyValue(typeOfLazyResult);
object lazyResult = creationResult.WasSuccessful
? creationResult.Result
: typeOfLazyResult.GetDefaultValue();
var funcType = typeof(Func <>).MakeGenericType(typeOfLazyResult);
var method = CreateGenericFromResultMethodDefinition().MakeGenericMethod(typeOfLazyResult);
var func = method.Invoke(null, new[] { lazyResult });
var dummy = typeOfDummy.GetConstructor(new[] { funcType, typeof(bool) }).Invoke(new[] { func, true });
return(CreationResult.SuccessfullyCreated(dummy));
}
return(CreationResult.FailedToCreateDummy(typeOfDummy, "It is not a Lazy."));
}
public CreationResult TryResolveDummyValue(Type typeOfDummy, LoopDetectingResolutionContext resolutionContext)
{
if (this.strategyCache.TryGetValue(typeOfDummy, out ResolveStrategy cachedStrategy))
{
return(cachedStrategy.TryCreateDummyValue(typeOfDummy, this, resolutionContext));
}
if (!resolutionContext.TryBeginToResolve(typeOfDummy))
{
return(CreationResult.FailedToCreateDummy(typeOfDummy, "Recursive dependency detected. Already resolving " + typeOfDummy + '.'));
}
var creationResult = this.TryResolveDummyValueWithAllAvailableStrategies(typeOfDummy, resolutionContext);
if (creationResult.WasSuccessful)
{
resolutionContext.OnSuccessfulResolve(typeOfDummy);
}
return(creationResult);
}
public override CreationResult TryCreateDummyValue(Type typeOfDummy, IDummyValueResolver resolver, LoopDetectingResolutionContext resolutionContext)
{
if (IsTuple(typeOfDummy))
{
var argTypes = typeOfDummy.GetTypeInfo().GetGenericArguments();
var args = new object[argTypes.Length];
for (int i = 0; i < argTypes.Length; i++)
{
var argType = argTypes[i];
var creationResult = resolver.TryResolveDummyValue(argType, resolutionContext);
args[i] = creationResult.WasSuccessful
? creationResult.Result
: argType.GetDefaultValue();
}
var dummy = Activator.CreateInstance(typeOfDummy, args);
return(CreationResult.SuccessfullyCreated(dummy));
}
return(CreationResult.FailedToCreateDummy(typeOfDummy, "It is not a tuple."));
}
public override CreationResult TryCreateDummyValue(Type typeOfDummy, IDummyValueResolver resolver)
{
if (typeOfDummy == typeof(Task))
{
return(CreationResult.SuccessfullyCreated(TaskHelper.FromResult(default(object))));
}
if (typeOfDummy.GetTypeInfo().IsGenericType&& typeOfDummy.GetGenericTypeDefinition() == typeof(Task <>))
{
var typeOfTaskResult = typeOfDummy.GetGenericArguments()[0];
var creationResult = resolver.TryResolveDummyValue(typeOfTaskResult);
object taskResult = creationResult.WasSuccessful
? creationResult.Result
: typeOfTaskResult.GetDefaultValue();
var method = GenericFromResultMethodDefinition.MakeGenericMethod(typeOfTaskResult);
return(CreationResult.SuccessfullyCreated(method.Invoke(null, new[] { taskResult })));
}
return(CreationResult.FailedToCreateDummy(typeOfDummy, "It is not a Task."));
}