public void AddsTypeRequestInfosWithValueTypes()
{
var typeArray = CreateArrayWithOnlyValueTypes();
var path = new TypeRequestPath(typeArray);
for (int i = 0; i < typeArray.Length; i++)
{
Assert.AreEqual(typeArray[i], path.AllTypes[i]);
}
Assert.AreEqual(typeArray[0], path.FirstType);
Assert.AreEqual(typeArray[typeArray.Length - 1], path.LastType);
}
public void DoesThrowCircularDependencyExceptionForDuplicateTypeIfSpecified()
{
var typeArray = CreateMixedArray();
var path = new TypeRequestPath(typeArray);
ExceptionTester.CallMethodAndExpectException<CircularDependencyException>(() => path.PushType(new TypeRequestInfo(typeof(X)), true));
}
public void ReturnsFalseForInvalidPath()
{
var typeArray = CreateInvalidPath();
var path = new TypeRequestPath(typeArray);
Assert.IsFalse(path.IsValid);
}
public void ReturnsTrueForValidPath()
{
var typeArray = CreateMixedArray();
var path = new TypeRequestPath(typeArray);
Assert.IsTrue(path.IsValid);
}
public void ReturnsRightType()
{
var typeArray = CreateArrayWithOnlyValueTypes();
var path = new TypeRequestPath(typeArray);
Assert.AreEqual(typeArray[typeArray.Length - 1], path.LastType);
}
/// <summary>
/// Creates an instance of the specified type using dependency injection.
/// </summary>
/// <param name="typeToConstruct">The type to construct.</param>
/// <returns>The instantiated type using dependency injection.</returns>
/// <exception cref="ArgumentNullException">The <paramref name="typeToConstruct"/> is <c>null</c>.</exception>
public object CreateInstance(Type typeToConstruct)
{
Argument.IsNotNull("typeToConstruct", typeToConstruct);
lock (_lockObject)
{
TypeRequestInfo typeRequestInfo = null;
try
{
typeRequestInfo = new TypeRequestInfo(typeToConstruct);
if (_currentTypeRequestPath == null)
{
_currentTypeRequestPath = new TypeRequestPath(typeRequestInfo, name: TypeRequestPathName);
}
else
{
_currentTypeRequestPath.PushType(typeRequestInfo, true);
}
var constructorCacheKey = new ConstructorCacheKey(typeToConstruct, new object[] { });
if (_constructorCache.ContainsKey(constructorCacheKey))
{
var cachedConstructor = _constructorCache[constructorCacheKey];
var instanceCreatedWithInjection = TryCreateWithConstructorInjection(typeToConstruct, cachedConstructor, false);
if (instanceCreatedWithInjection != null)
{
CompleteTypeRequestPathIfRequired(typeRequestInfo);
return(instanceCreatedWithInjection);
}
Log.Warning("Found constructor for type '{0}' in constructor, but it failed to create an instance. Removing the constructor from the cache", typeToConstruct.FullName);
_constructorCache.Remove(constructorCacheKey);
}
Log.Debug("Creating instance of type '{0}'. No constructor found in the cache, so searching for the right one.", typeToConstruct.FullName);
var typeConstructorsMetadata = GetTypeMetaData(typeToConstruct);
var constructors = typeConstructorsMetadata.GetConstructors();
for (int i = 0; i < constructors.Count; i++)
{
var constructor = constructors[i];
var instanceCreatedWithInjection = TryCreateWithConstructorInjection(typeToConstruct, constructor, i < constructors.Count - 1);
if (instanceCreatedWithInjection != null)
{
CompleteTypeRequestPathIfRequired(typeRequestInfo);
// We found a constructor that works, cache it
_constructorCache[constructorCacheKey] = constructor;
return(instanceCreatedWithInjection);
}
}
var createdInstanceUsingActivator = CreateInstanceUsingActivator(typeToConstruct);
if (createdInstanceUsingActivator != null)
{
CompleteTypeRequestPathIfRequired(typeRequestInfo);
return(createdInstanceUsingActivator);
}
}
catch (CircularDependencyException)
{
throw;
}
catch (Exception ex)
{
CloseCurrentTypeIfRequired(typeRequestInfo);
Log.Warning(ex, "Failed to construct type '{0}'", typeToConstruct.FullName);
throw;
}
CloseCurrentTypeIfRequired(typeRequestInfo);
return(null);
}
}
public void RemovesTypeRangeUntilSpecificType()
{
var path = new TypeRequestPath(new TypeRequestInfo(typeof(X)));
path.PushType(new TypeRequestInfo(typeof(object)), false);
path.PushType(new TypeRequestInfo(typeof(Y)), false);
path.PushType(new TypeRequestInfo(typeof(object)), false);
path.PushType(new TypeRequestInfo(typeof(Z)), false);
path.MarkTypeAsNotCreated(new TypeRequestInfo(typeof(Y)));
Assert.AreEqual(2, path.TypeCount);
Assert.AreEqual(new TypeRequestInfo(typeof(X)), path.AllTypes[0]);
Assert.AreEqual(new TypeRequestInfo(typeof(object)), path.AllTypes[1]);
}
public void ThrowsInvalidOperationExceptionWhenTypeRequestPathOnlyContainsOneType()
{
var typeArray = CreateMixedArray();
var path = new TypeRequestPath(typeArray);
while (path.AllTypes.Length > 1)
{
path.PopType();
}
ExceptionTester.CallMethodAndExpectException<InvalidOperationException>(path.PopType);
}
/// <summary>
/// Creates an instance of the specified type using the specified parameters as injection values.
/// </summary>
/// <param name="typeToConstruct">The type to construct.</param>
/// <param name="parameters">The parameters to inject.</param>
/// <param name="autoCompleteDependencies">if set to <c>true</c>, the additional dependencies will be auto completed.</param>
/// <param name="preventCircularDependencies">if set to <c>true</c>, prevent circular dependencies using the <see cref="TypeRequestPath"/>.</param>
/// <returns>The instantiated type using dependency injection.</returns>
/// <exception cref="ArgumentNullException">The <paramref name="typeToConstruct" /> is <c>null</c>.</exception>
private object CreateInstanceWithSpecifiedParameters(Type typeToConstruct, object[] parameters,
bool autoCompleteDependencies, bool preventCircularDependencies = true)
{
Argument.IsNotNull("typeToConstruct", typeToConstruct);
if (parameters == null)
{
parameters = new object[] { };
}
lock (_serviceLocator)
{
TypeRequestInfo typeRequestInfo = null;
try
{
if (preventCircularDependencies)
{
typeRequestInfo = new TypeRequestInfo(typeToConstruct);
if (_currentTypeRequestPath == null)
{
_currentTypeRequestPath = new TypeRequestPath(typeRequestInfo, name: TypeRequestPathName);
}
else
{
_currentTypeRequestPath.PushType(typeRequestInfo, true);
}
}
var constructorCache = GetConstructorCache(autoCompleteDependencies);
var constructorCacheKey = new ConstructorCacheKey(typeToConstruct, parameters);
if (constructorCache.ContainsKey(constructorCacheKey))
{
var cachedConstructor = constructorCache[constructorCacheKey];
var instanceCreatedWithInjection = TryCreateToConstruct(typeToConstruct, cachedConstructor,
parameters, false, false);
if (instanceCreatedWithInjection != null)
{
if (preventCircularDependencies)
{
CompleteTypeRequestPathIfRequired(typeRequestInfo);
}
return(instanceCreatedWithInjection);
}
Log.Warning("Found constructor for type '{0}' in constructor, but it failed to create an instance. Removing the constructor from the cache", typeToConstruct.FullName);
constructorCache.Remove(constructorCacheKey);
}
Log.Debug("Creating instance of type '{0}' using specific parameters. No constructor found in the cache, so searching for the right one", typeToConstruct.FullName);
var typeConstructorsMetadata = GetTypeMetaData(typeToConstruct);
var constructors = typeConstructorsMetadata.GetConstructors(parameters.Count(), !autoCompleteDependencies);
for (int i = 0; i < constructors.Count; i++)
{
var constructor = constructors[i];
var instanceCreatedWithInjection = TryCreateToConstruct(typeToConstruct, constructor,
parameters, true, i < constructors.Count - 1);
if (instanceCreatedWithInjection != null)
{
if (preventCircularDependencies)
{
CompleteTypeRequestPathIfRequired(typeRequestInfo);
}
// We found a constructor that works, cache it
constructorCache[constructorCacheKey] = constructor;
// Only update the rule when using a constructor for the first time, not when using it from the cache
ApiCop.UpdateRule <TooManyDependenciesApiCopRule>("TypeFactory.LimitDependencyInjection",
x => x.SetNumberOfDependenciesInjected(typeToConstruct, constructor.GetParameters().Count()));
return(instanceCreatedWithInjection);
}
}
Log.Debug("No constructor could be used, cannot construct type '{0}' with the specified parameters", typeToConstruct.FullName);
}
catch (CircularDependencyException)
{
throw;
}
catch (Exception ex)
{
if (preventCircularDependencies)
{
CloseCurrentTypeIfRequired(typeRequestInfo);
}
Log.Warning(ex, "Failed to construct type '{0}'", typeToConstruct.FullName);
throw;
}
if (preventCircularDependencies)
{
CloseCurrentTypeIfRequired(typeRequestInfo);
}
return(null);
}
}
/// <summary>
/// Creates an instance of the specified type using the specified parameters as injection values.
/// </summary>
/// <param name="typeToConstruct">The type to construct.</param>
/// <param name="parameters">The parameters to inject.</param>
/// <param name="autoCompleteDependencies">if set to <c>true</c>, the additional dependencies will be auto completed.</param>
/// <param name="preventCircularDependencies">if set to <c>true</c>, prevent circular dependencies using the <see cref="TypeRequestPath"/>.</param>
/// <returns>The instantiated type using dependency injection.</returns>
/// <exception cref="ArgumentNullException">The <paramref name="typeToConstruct" /> is <c>null</c>.</exception>
private object CreateInstanceWithSpecifiedParameters(Type typeToConstruct, object[] parameters,
bool autoCompleteDependencies, bool preventCircularDependencies = true)
{
Argument.IsNotNull("typeToConstruct", typeToConstruct);
if (parameters == null)
{
parameters = new object[] { };
}
lock (_serviceLocator)
{
TypeRequestInfo typeRequestInfo = null;
try
{
if (preventCircularDependencies)
{
typeRequestInfo = new TypeRequestInfo(typeToConstruct);
if (_currentTypeRequestPath == null)
{
_currentTypeRequestPath = new TypeRequestPath(typeRequestInfo, name: TypeRequestPathName);
}
else
{
_currentTypeRequestPath.PushType(typeRequestInfo, true);
}
}
var constructorCache = GetConstructorCache(autoCompleteDependencies);
var constructorCacheKey = new ConstructorCacheKey(typeToConstruct, parameters);
if (constructorCache.ContainsKey(constructorCacheKey))
{
var cachedConstructor = constructorCache[constructorCacheKey];
var instanceCreatedWithInjection = TryCreateToConstruct(typeToConstruct, cachedConstructor,
parameters, false, false);
if (instanceCreatedWithInjection != null)
{
if (preventCircularDependencies)
{
CompleteTypeRequestPathIfRequired(typeRequestInfo);
}
return instanceCreatedWithInjection;
}
Log.Warning("Found constructor for type '{0}' in constructor, but it failed to create an instance. Removing the constructor from the cache", typeToConstruct.FullName);
constructorCache.Remove(constructorCacheKey);
}
Log.Debug("Creating instance of type '{0}' using specific parameters. No constructor found in the cache, so searching for the right one", typeToConstruct.FullName);
var typeConstructorsMetadata = GetTypeMetaData(typeToConstruct);
var constructors = typeConstructorsMetadata.GetConstructors(parameters.Count(), !autoCompleteDependencies);
for (int i = 0; i < constructors.Count; i++)
{
var constructor = constructors[i];
var instanceCreatedWithInjection = TryCreateToConstruct(typeToConstruct, constructor,
parameters, true, i < constructors.Count - 1);
if (instanceCreatedWithInjection != null)
{
if (preventCircularDependencies)
{
CompleteTypeRequestPathIfRequired(typeRequestInfo);
}
// We found a constructor that works, cache it
constructorCache[constructorCacheKey] = constructor;
// Only update the rule when using a constructor for the first time, not when using it from the cache
ApiCop.UpdateRule<TooManyDependenciesApiCopRule>("TypeFactory.LimitDependencyInjection",
x => x.SetNumberOfDependenciesInjected(typeToConstruct, constructor.GetParameters().Count()));
return instanceCreatedWithInjection;
}
}
Log.Debug("No constructor could be used, cannot construct type '{0}' with the specified parameters", typeToConstruct.FullName);
}
catch (CircularDependencyException)
{
throw;
}
catch (Exception ex)
{
if (preventCircularDependencies)
{
CloseCurrentTypeIfRequired(typeRequestInfo);
}
Log.Warning(ex, "Failed to construct type '{0}'", typeToConstruct.FullName);
throw;
}
if (preventCircularDependencies)
{
CloseCurrentTypeIfRequired(typeRequestInfo);
}
return null;
}
}
/// <summary>
/// Marks the specified type as not being created. If this was the only type being constructed, the type request
/// path will be closed.
/// </summary>
/// <param name="typeRequestInfoForTypeJustConstructed">The type request info for type just constructed.</param>
private void CloseCurrentTypeIfRequired(TypeRequestInfo typeRequestInfoForTypeJustConstructed)
{
lock (_serviceLocator)
{
if (_currentTypeRequestPath != null)
{
_currentTypeRequestPath.MarkTypeAsNotCreated(typeRequestInfoForTypeJustConstructed);
if (_currentTypeRequestPath.TypeCount == 1)
{
// We failed to create the only type in the request path, exit
_currentTypeRequestPath = null;
}
}
}
}
/// <summary>
/// Completes the type request path by checking if the currently created type is the same as the first
/// type meaning that the type is successfully created and the current type request path can be set to <c>null</c>.
/// </summary>
/// <param name="typeRequestInfoForTypeJustConstructed">The type request info.</param>
private void CompleteTypeRequestPathIfRequired(TypeRequestInfo typeRequestInfoForTypeJustConstructed)
{
lock (_lockObject)
{
if (_currentTypeRequestPath != null)
{
if (_currentTypeRequestPath.FirstType == typeRequestInfoForTypeJustConstructed)
{
_currentTypeRequestPath = null;
}
}
}
}
/// <summary>
/// Creates an instance of the specified type using dependency injection.
/// </summary>
/// <param name="typeToConstruct">The type to construct.</param>
/// <returns>The instantiated type using dependency injection.</returns>
/// <exception cref="ArgumentNullException">The <paramref name="typeToConstruct"/> is <c>null</c>.</exception>
public object CreateInstance(Type typeToConstruct)
{
Argument.IsNotNull("typeToConstruct", typeToConstruct);
lock (_lockObject)
{
TypeRequestInfo typeRequestInfo = null;
try
{
#if !DISABLE_TYPEPATH
typeRequestInfo = new TypeRequestInfo(typeToConstruct);
if (_currentTypeRequestPath == null)
{
_currentTypeRequestPath = new TypeRequestPath(typeRequestInfo);
}
else
{
_currentTypeRequestPath.PushType(typeRequestInfo, true);
}
#endif
if (_constructorCache.ContainsKey(typeToConstruct))
{
var instanceCreatedWithInjection = TryCreateWithConstructorInjection(typeToConstruct, _constructorCache[typeToConstruct]);
if (instanceCreatedWithInjection != null)
{
#if !DISABLE_TYPEPATH
CompleteTypeRequestPathIfRequired(typeRequestInfo);
#endif
return instanceCreatedWithInjection;
}
Log.Warning("Found constructor for type '{0}' in constructor, but it failed to create an instance. Removing the constructor from the cache", typeToConstruct.FullName);
_constructorCache.Remove(typeToConstruct);
}
Log.Debug("Creating instance of type '{0}'. No constructor found in the cache, so searching for the right one.", typeToConstruct.FullName);
var constructors = (from constructor in typeToConstruct.GetConstructorsEx()
orderby constructor.GetParameters().Count() descending
select constructor).ToList();
foreach (var constructor in constructors)
{
var instanceCreatedWithInjection = TryCreateWithConstructorInjection(typeToConstruct, constructor);
if (instanceCreatedWithInjection != null)
{
#if !DISABLE_TYPEPATH
CompleteTypeRequestPathIfRequired(typeRequestInfo);
#endif
// We found a constructor that works, cache it
_constructorCache[typeToConstruct] = constructor;
return instanceCreatedWithInjection;
}
}
var createdInstanceUsingActivator = CreateInstanceUsingActivator(typeToConstruct);
if (createdInstanceUsingActivator != null)
{
#if !DISABLE_TYPEPATH
CompleteTypeRequestPathIfRequired(typeRequestInfo);
#endif
return createdInstanceUsingActivator;
}
}
catch (CircularDependencyException)
{
throw;
}
catch (Exception ex)
{
CloseCurrentTypeTypeIfRequired(typeRequestInfo);
Log.Warning(ex, "Failed to construct type '{0}'", typeToConstruct.FullName);
throw;
}
CloseCurrentTypeTypeIfRequired(typeRequestInfo);
return null;
}
}
/// <summary>
/// Creates an instance of the specified type using the specified parameters as injection values.
/// </summary>
/// <param name="typeToConstruct">The type to construct.</param>
/// <param name="tag">The preferred tag when resolving dependencies.</param>
/// <param name="parameters">The parameters to inject.</param>
/// <param name="autoCompleteDependencies">if set to <c>true</c>, the additional dependencies will be auto completed.</param>
/// <returns>The instantiated type using dependency injection.</returns>
/// <exception cref="ArgumentNullException">The <paramref name="typeToConstruct" /> is <c>null</c>.</exception>
private object CreateInstanceWithSpecifiedParameters(Type typeToConstruct, object tag, object[] parameters, bool autoCompleteDependencies)
{
Argument.IsNotNull("typeToConstruct", typeToConstruct);
if (parameters is null)
{
parameters = ArrayShim.Empty <object>();
}
var previousRequestPath = _currentTypeRequestPath.Value;
try
{
var typeRequestInfo = new TypeRequestInfo(typeToConstruct);
_currentTypeRequestPath.Value = TypeRequestPath.Branch(previousRequestPath, typeRequestInfo);
var constructorCacheKey = new ConstructorCacheKey(typeToConstruct, autoCompleteDependencies, parameters);
var typeConstructorsMetadata = GetTypeMetaData(typeToConstruct);
var constructorCacheValue = GetConstructor(constructorCacheKey);
if (constructorCacheValue.ConstructorInfo != null)
{
var cachedConstructor = constructorCacheValue.ConstructorInfo;
var instanceCreatedWithInjection = TryCreateToConstruct(typeToConstruct, cachedConstructor, tag, parameters, false, false, typeConstructorsMetadata);
if (instanceCreatedWithInjection != null)
{
return(instanceCreatedWithInjection);
}
Log.Warning("Found constructor for type '{0}' in constructor, but it failed to create an instance. Removing the constructor from the cache", typeToConstruct.FullName);
SetConstructor(constructorCacheKey, constructorCacheValue, null);
}
Log.Debug("Creating instance of type '{0}' using specific parameters. No constructor found in the cache, so searching for the right one", typeToConstruct.FullName);
var constructors = typeConstructorsMetadata.GetConstructors(parameters.Length, !autoCompleteDependencies).SortByParametersMatchDistance(parameters).ToList();
for (int i = 0; i < constructors.Count; i++)
{
var constructor = constructors[i];
var instanceCreatedWithInjection = TryCreateToConstruct(typeToConstruct, constructor, tag, parameters, true, i < constructors.Count - 1, typeConstructorsMetadata);
if (instanceCreatedWithInjection != null)
{
// We found a constructor that works, cache it
SetConstructor(constructorCacheKey, constructorCacheValue, constructor);
// Only update the rule when using a constructor for the first time, not when using it from the cache
ApiCop.UpdateRule <TooManyDependenciesApiCopRule>("TypeFactory.LimitDependencyInjection", x => x.SetNumberOfDependenciesInjected(typeToConstruct, constructor.GetParameters().Count()));
return(instanceCreatedWithInjection);
}
}
Log.Debug("No constructor could be used, cannot construct type '{0}' with the specified parameters", typeToConstruct.FullName);
}
catch (CircularDependencyException)
{
throw;
}
catch (Exception ex)
{
Log.Warning(ex, "Failed to construct type '{0}'", typeToConstruct.FullName);
throw;
}
finally
{
_currentTypeRequestPath.Value = previousRequestPath;
}
return(null);
}
/// <summary>
/// Creates an instance of the specified type using dependency injection.
/// </summary>
/// <param name="typeToConstruct">The type to construct.</param>
/// <returns>The instantiated type using dependency injection.</returns>
/// <exception cref="ArgumentNullException">The <paramref name="typeToConstruct"/> is <c>null</c>.</exception>
public object CreateInstance(Type typeToConstruct)
{
Argument.IsNotNull("typeToConstruct", typeToConstruct);
lock (_lockObject)
{
TypeRequestInfo typeRequestInfo = null;
try
{
#if !DISABLE_TYPEPATH
typeRequestInfo = new TypeRequestInfo(typeToConstruct);
if (_currentTypeRequestPath == null)
{
_currentTypeRequestPath = new TypeRequestPath(typeRequestInfo);
}
else
{
_currentTypeRequestPath.PushType(typeRequestInfo, true);
}
#endif
if (_constructorCache.ContainsKey(typeToConstruct))
{
var instanceCreatedWithInjection = TryCreateWithConstructorInjection(typeToConstruct, _constructorCache[typeToConstruct]);
if (instanceCreatedWithInjection != null)
{
#if !DISABLE_TYPEPATH
CompleteTypeRequestPathIfRequired(typeRequestInfo);
#endif
return(instanceCreatedWithInjection);
}
Log.Warning("Found constructor for type '{0}' in constructor, but it failed to create an instance. Removing the constructor from the cache", typeToConstruct.FullName);
_constructorCache.Remove(typeToConstruct);
}
Log.Debug("Creating instance of type '{0}'. No constructor found in the cache, so searching for the right one.", typeToConstruct.FullName);
var constructors = (from constructor in typeToConstruct.GetConstructorsEx()
orderby constructor.GetParameters().Count() descending
select constructor).ToList();
foreach (var constructor in constructors)
{
var instanceCreatedWithInjection = TryCreateWithConstructorInjection(typeToConstruct, constructor);
if (instanceCreatedWithInjection != null)
{
#if !DISABLE_TYPEPATH
CompleteTypeRequestPathIfRequired(typeRequestInfo);
#endif
// We found a constructor that works, cache it
_constructorCache[typeToConstruct] = constructor;
return(instanceCreatedWithInjection);
}
}
var createdInstanceUsingActivator = CreateInstanceUsingActivator(typeToConstruct);
if (createdInstanceUsingActivator != null)
{
#if !DISABLE_TYPEPATH
CompleteTypeRequestPathIfRequired(typeRequestInfo);
#endif
return(createdInstanceUsingActivator);
}
}
catch (CircularDependencyException)
{
throw;
}
catch (Exception ex)
{
CloseCurrentTypeTypeIfRequired(typeRequestInfo);
Log.Warning(ex, "Failed to construct type '{0}'", typeToConstruct.FullName);
throw;
}
CloseCurrentTypeTypeIfRequired(typeRequestInfo);
return(null);
}
}
public void DoesNotThrowCircularDependencyExceptionForDuplicateTypeIfNotSpecified()
{
var typeArray = CreateMixedArray();
var path = new TypeRequestPath(typeArray);
path.PushType(new TypeRequestInfo(typeof(X)), false);
Assert.IsFalse(path.IsValid);
}
public void DoesNotIgnoreValueTypesIfIgnoreValueTypesIsFalse()
{
var firstType = new TypeRequestInfo(typeof(X));
var path = new TypeRequestPath(firstType, false);
path.PushType(new TypeRequestInfo(typeof(DateTime)), false);
Assert.AreEqual(typeof(DateTime), path.LastType.Type);
path.PushType(new TypeRequestInfo(typeof(double)), false);
Assert.AreEqual(typeof(double), path.LastType.Type);
path.PushType(new TypeRequestInfo(typeof(int)), false);
Assert.AreEqual(typeof(int), path.LastType.Type);
}
/// <summary>
/// Resolves the type from a known container.
/// </summary>
/// <param name="serviceType">Type of the service.</param>
/// <param name="tag">The tag to register the service with. The default value is <c>null</c>.</param>
/// <returns>An instance of the type registered on the service.</returns>
/// <exception cref="ArgumentNullException">The <paramref name="serviceType"/> is <c>null</c>.</exception>
/// <exception cref="ArgumentOutOfRangeException">The type is not found in any container.</exception>
private object ResolveTypeFromKnownContainer(Type serviceType, object tag)
{
Argument.IsNotNull("serviceType", serviceType);
lock (this)
{
var typeRequestInfo = new TypeRequestInfo(serviceType, tag);
if (_currentTypeRequestPath == null)
{
_currentTypeRequestPath = new TypeRequestPath(typeRequestInfo, name: "ServiceLocator");
_currentTypeRequestPath.IgnoreDuplicateRequestsDirectlyAfterEachother = false;
}
else
{
_currentTypeRequestPath.PushType(typeRequestInfo, false);
if (!_currentTypeRequestPath.IsValid)
{
// Reset path for next types that are being resolved
var typeRequestPath = _currentTypeRequestPath;
_currentTypeRequestPath = null;
typeRequestPath.ThrowsExceptionIfInvalid();
}
}
var serviceInfo = new ServiceInfo(serviceType, tag);
var registeredTypeInfo = _registeredTypes[serviceInfo];
object instance = registeredTypeInfo.CreateServiceFunc(registeredTypeInfo);
if (instance == null)
{
ThrowTypeNotRegisteredException(serviceType);
}
if (IsTypeRegisteredAsSingleton(serviceType, tag))
{
RegisterInstance(serviceType, instance, tag, this);
}
CompleteTypeRequestPathIfRequired(typeRequestInfo);
return instance;
}
}
public void ThrowsArgumentNullExceptionForNullTypeRequestInfo()
{
var typeArray = CreateMixedArray();
var path = new TypeRequestPath(typeArray);
ExceptionTester.CallMethodAndExpectException<ArgumentNullException>(() => path.MarkTypeAsNotCreated(null));
}
/// <summary>
/// Completes the type request path by checking if the currently created type is the same as the first
/// type meaning that the type is successfully created and the current type request path can be set to <c>null</c>.
/// </summary>
/// <param name="typeRequestInfoForTypeJustConstructed">The type request info.</param>
private void CompleteTypeRequestPathIfRequired(TypeRequestInfo typeRequestInfoForTypeJustConstructed)
{
lock (this)
{
if (_currentTypeRequestPath != null)
{
if (_currentTypeRequestPath.LastType == typeRequestInfoForTypeJustConstructed)
{
_currentTypeRequestPath.MarkTypeAsCreated(typeRequestInfoForTypeJustConstructed);
}
if (_currentTypeRequestPath.TypeCount == 0)
{
_currentTypeRequestPath = null;
}
}
}
}
/// <summary>
/// Throws the <see cref="TypeNotRegisteredException" /> but will also reset the current type request path.
/// </summary>
/// <param name="type">The type.</param>
/// <param name="message">The message.</param>
private void ThrowTypeNotRegisteredException(Type type, string message = null)
{
_currentTypeRequestPath = null;
// or _currentTypeRequestPath.PopType();
throw Log.ErrorAndCreateException(msg => new TypeNotRegisteredException(type, msg),
"The type '{0}' is not registered", type.GetSafeFullName());
}
/// <summary>
/// Creates an instance of the specified type using dependency injection.
/// </summary>
/// <param name="typeToConstruct">The type to construct.</param>
/// <returns>The instantiated type using dependency injection.</returns>
/// <exception cref="ArgumentNullException">The <paramref name="typeToConstruct"/> is <c>null</c>.</exception>
public object CreateInstance(Type typeToConstruct)
{
Argument.IsNotNull("typeToConstruct", typeToConstruct);
lock (_lockObject)
{
TypeRequestInfo typeRequestInfo = null;
try
{
typeRequestInfo = new TypeRequestInfo(typeToConstruct);
if (_currentTypeRequestPath == null)
{
_currentTypeRequestPath = new TypeRequestPath(typeRequestInfo, name: TypeRequestPathName);
}
else
{
_currentTypeRequestPath.PushType(typeRequestInfo, true);
}
var constructorCacheKey = new ConstructorCacheKey(typeToConstruct, new object[] { });
if (_constructorCache.ContainsKey(constructorCacheKey))
{
var cachedConstructor = _constructorCache[constructorCacheKey];
var instanceCreatedWithInjection = TryCreateWithConstructorInjection(typeToConstruct, cachedConstructor, false);
if (instanceCreatedWithInjection != null)
{
CompleteTypeRequestPathIfRequired(typeRequestInfo);
return instanceCreatedWithInjection;
}
Log.Warning("Found constructor for type '{0}' in constructor, but it failed to create an instance. Removing the constructor from the cache", typeToConstruct.FullName);
_constructorCache.Remove(constructorCacheKey);
}
Log.Debug("Creating instance of type '{0}'. No constructor found in the cache, so searching for the right one.", typeToConstruct.FullName);
var typeConstructorsMetadata = GetTypeMetaData(typeToConstruct);
var constructors = typeConstructorsMetadata.GetConstructors();
for (int i = 0; i < constructors.Count; i++)
{
var constructor = constructors[i];
var instanceCreatedWithInjection = TryCreateWithConstructorInjection(typeToConstruct, constructor, i < constructors.Count - 1);
if (instanceCreatedWithInjection != null)
{
CompleteTypeRequestPathIfRequired(typeRequestInfo);
// We found a constructor that works, cache it
_constructorCache[constructorCacheKey] = constructor;
return instanceCreatedWithInjection;
}
}
var createdInstanceUsingActivator = CreateInstanceUsingActivator(typeToConstruct);
if (createdInstanceUsingActivator != null)
{
CompleteTypeRequestPathIfRequired(typeRequestInfo);
return createdInstanceUsingActivator;
}
}
catch (CircularDependencyException)
{
throw;
}
catch (Exception ex)
{
CloseCurrentTypeIfRequired(typeRequestInfo);
Log.Warning(ex, "Failed to construct type '{0}'", typeToConstruct.FullName);
throw;
}
CloseCurrentTypeIfRequired(typeRequestInfo);
return null;
}
}