/// <summary>
/// Adds the type to the type path.
/// </summary>
/// <param name="typeRequestInfo">The type request info.</param>
/// <param name="throwExceptionForDuplicateTypes">If set to <c>true</c>, this method will throw a <see cref="CircularDependencyException" /> for duplicate types.</param>
/// <param name="ignoreValueTypes">If set to <c>true</c>, value types will be ignored.</param>
/// <exception cref="ArgumentNullException">The <paramref name="typeRequestInfo" /> is <c>null</c>.</exception>
/// <exception cref="CircularDependencyException">The type is already in the type path and <paramref name="throwExceptionForDuplicateTypes" /> is <c>true</c>.</exception>
private void PushType(TypeRequestInfo typeRequestInfo, bool throwExceptionForDuplicateTypes, bool ignoreValueTypes)
{
Argument.IsNotNull("typeRequestInfo", typeRequestInfo);
if (ignoreValueTypes)
{
if (typeRequestInfo.Type.IsValueTypeEx())
{
return;
}
}
var lastTypeRequest = _typePath.LastOrDefault();
if ((lastTypeRequest == typeRequestInfo) && IgnoreDuplicateRequestsDirectlyAfterEachother)
{
Log.Debug("Requesting type {0} twice after eachother, ignoring second request", typeRequestInfo);
return;
}
bool alreadyContainsType = _typePath.Contains(typeRequestInfo);
_typePath.Add(typeRequestInfo);
if (throwExceptionForDuplicateTypes)
{
ThrowsExceptionIfInvalid();
}
}
/// <summary>
/// Adds the type to the type path.
/// </summary>
/// <param name="typeRequestInfo">The type request info.</param>
/// <param name="throwExceptionForDuplicateTypes">If set to <c>true</c>, this method will throw a <see cref="CircularDependencyException" /> for duplicate types.</param>
/// <param name="ignoreValueTypes">If set to <c>true</c>, value types will be ignored.</param>
/// <exception cref="ArgumentNullException">The <paramref name="typeRequestInfo" /> is <c>null</c>.</exception>
/// <exception cref="CircularDependencyException">The type is already in the type path and <paramref name="throwExceptionForDuplicateTypes" /> is <c>true</c>.</exception>
private void PushType(TypeRequestInfo typeRequestInfo, bool throwExceptionForDuplicateTypes, bool ignoreValueTypes)
{
Argument.IsNotNull("typeRequestInfo", typeRequestInfo);
if (ignoreValueTypes)
{
if (typeRequestInfo.Type.IsValueTypeEx())
{
return;
}
}
var lastTypeRequest = _typePath.LastOrDefault();
if (lastTypeRequest == typeRequestInfo)
{
Log.Debug("Requesting type {0} twice after eachother, ignoring second request", typeRequestInfo);
return;
}
bool alreadyContainsType = _typePath.Contains(typeRequestInfo);
_typePath.Add(typeRequestInfo);
if (throwExceptionForDuplicateTypes)
{
if (alreadyContainsType)
{
string error = string.Format("Found a circular dependency while resolving '{0}', it is used by '{1}'", FirstType, _typePath[_typePath.Count - 2]);
Log.Error(error);
throw new CircularDependencyException(this, string.Format("{0}. For more information, view the enclosed TypeRequestPath", error));
}
}
}
public void SetsValuesCorrectly()
{
var typeRequestInfo = new TypeRequestInfo(typeof(int), "mytag");
Assert.AreEqual(typeof(int), typeRequestInfo.Type);
Assert.AreEqual("mytag", typeRequestInfo.Tag);
}
/// <summary>
/// Initializes a new instance of the <see cref="CircularDependencyException" /> class.
/// </summary>
/// <param name="duplicateRequestInfo">Type request that occurred second time.</param>
/// <param name="typePath">The type path.</param>
/// <param name="message">The message.</param>
/// <exception cref="ArgumentNullException">The <paramref name="typePath"/> is <c>null</c>.</exception>
internal CircularDependencyException(TypeRequestInfo duplicateRequestInfo, ITypeRequestPath typePath, string message)
: base(message)
{
Argument.IsNotNull("duplicateRequestInfo", duplicateRequestInfo);
Argument.IsNotNull("typePath", typePath);
DuplicateRequestInfo = duplicateRequestInfo;
TypePath = typePath;
}
/// <summary>
/// Initializes a new instance of the <see cref="TypeRequestPath" /> class.
/// </summary>
/// <param name="typeRequestInfos">The type requests already in the path.</param>
/// <param name="ignoreValueTypes">If set to <c>true</c>, this type path will ignore value types.</param>
/// <exception cref="ArgumentException">The <paramref name="typeRequestInfos" /> is <c>null</c> or an empty array.</exception>
public TypeRequestPath(TypeRequestInfo[] typeRequestInfos, bool ignoreValueTypes = true)
{
Argument.IsNotNullOrEmptyArray("typeRequestInfos", typeRequestInfos);
IgnoreValueTypes = ignoreValueTypes;
foreach (var typeRequestInfo in typeRequestInfos)
{
PushType(typeRequestInfo, false, false);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="TypeRequestPath" /> class.
/// </summary>
/// <param name="typeRequestInfos">The type requests already in the path.</param>
/// <param name="ignoreValueTypes">If set to <c>true</c>, this type path will ignore value types.</param>
/// <param name="name">The name, can be <c>null</c>.</param>
/// <exception cref="ArgumentException">The <paramref name="typeRequestInfos" /> is <c>null</c> or an empty array.</exception>
public TypeRequestPath(TypeRequestInfo[] typeRequestInfos, bool ignoreValueTypes = true, string name = null)
{
Argument.IsNotNullOrEmptyArray("typeRequestInfos", typeRequestInfos);
IgnoreValueTypes = ignoreValueTypes;
IgnoreDuplicateRequestsDirectlyAfterEachother = true;
Name = name;
foreach (var typeRequestInfo in typeRequestInfos)
{
PushType(typeRequestInfo, false, false);
}
}
/// <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>
/// Marks the type as created and removes all the history until this type from the request path.
/// </summary>
/// <param name="typeRequestInfo">The type request info.</param>
/// <exception cref="ArgumentNullException">The <paramref name="typeRequestInfo"/> is <c>null</c>.</exception>
public void MarkTypeAsCreated(TypeRequestInfo typeRequestInfo)
{
Argument.IsNotNull("typeRequestInfo", typeRequestInfo);
for (int i = _typePath.Count - 1; i >= 0; i--)
{
if (_typePath[i] == typeRequestInfo)
{
_typePath.RemoveRange(i, _typePath.Count - i);
return;
}
}
}
public void FunctionsCorrectlyForDifferentTags()
{
var obj1 = new TypeRequestInfo(typeof(int), "mytag1");
var obj2 = new TypeRequestInfo(typeof(int), "mytag2");
Assert.IsFalse(obj1 == obj2);
Assert.IsFalse(obj2 == obj1);
Assert.IsTrue(obj1 != obj2);
Assert.IsTrue(obj2 != obj1);
Assert.IsFalse(obj1.Equals(obj2));
Assert.IsFalse(obj2.Equals(obj1));
}
/// <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>
/// 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);
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);
}
}
/// <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>
/// Resolves the type from a known container.
/// </summary>
/// <param name="serviceInfo">The service information.</param>
/// <returns>
/// An instance of the type registered on the service.
/// </returns>
/// <exception cref="ArgumentNullException">The <paramref name="serviceInfo" /> is <c>null</c>.</exception>
/// <exception cref="ArgumentOutOfRangeException">The type is not found in any container.</exception>
private object ResolveTypeFromKnownContainer(ServiceInfo serviceInfo)
{
Argument.IsNotNull("serviceInfo", serviceInfo);
lock (_lockObject)
{
var previousTypeRequestPath = _currentTypeRequestPath.Value;
try
{
var typeRequestInfo = new TypeRequestInfo(serviceInfo.Type, serviceInfo.Tag);
_currentTypeRequestPath.Value = TypeRequestPath.Branch(previousTypeRequestPath, typeRequestInfo);
var registeredTypeInfo = _registeredTypes[serviceInfo];
var serviceType = serviceInfo.Type;
var tag = serviceInfo.Tag;
var instance = registeredTypeInfo.CreateServiceFunc(registeredTypeInfo);
if (instance != null && instance is Type)
{
instance = _typeFactory.CreateInstance((Type)instance);
}
if (instance == null)
{
ThrowTypeNotRegisteredException(serviceType);
}
if (IsTypeRegisteredAsSingleton(serviceType, tag))
{
RegisterInstance(serviceType, instance, tag, this);
}
return(instance);
}
finally
{
_currentTypeRequestPath.Value = previousTypeRequestPath;
}
}
}
/// <summary>
/// Creates branch of type request path.
/// </summary>
/// <param name="parent">Parent path</param>
/// <param name="typeRequestInfo">Appended path item</param>
/// <returns></returns>
public static TypeRequestPath Branch(TypeRequestPath parent, TypeRequestInfo typeRequestInfo)
{
Argument.IsNotNull("parent", parent);
Argument.IsNotNull("typeRequestInfo", typeRequestInfo);
//if (parent._typePath.Inde(o => o.Equals(typeRequestInfo)))
int previousIndex = Array.IndexOf(parent._typePath, typeRequestInfo);
if (previousIndex >= 0)
{
string circlePath = FormatPath(parent._typePath, previousIndex);
circlePath += " => " + typeRequestInfo.Type.Name;
throw Log.ErrorAndCreateException(msg => new CircularDependencyException(typeRequestInfo, parent, msg),
$"Found a circular dependency '{circlePath}' while resolving '{parent.FirstType}. For more information, view the enclosed TypeRequestPath'");
}
var parentTypePath = parent._typePath;
var typePath = new TypeRequestInfo[parent.TypeCount + 1];
Array.Copy(parentTypePath, typePath, parentTypePath.Length);
typePath[typePath.Length - 1] = typeRequestInfo;
return(new TypeRequestPath(typePath, parent.Name));
}
/// <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 == 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>
/// 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>
/// 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;
}
}
/// <summary>
/// Initializes a new instance of the <see cref="TypeRequestPath"/> class.
/// </summary>
/// <param name="typeRequestInfo">The type request info.</param>
/// <param name="ignoreValueTypes">If set to <c>true</c>, this type path will ignore value types.</param>
/// <exception cref="ArgumentNullException">The <paramref name="typeRequestInfo" /> is <c>null</c>.</exception>
public TypeRequestPath(TypeRequestInfo typeRequestInfo, bool ignoreValueTypes = true)
: this(new [] { typeRequestInfo }, ignoreValueTypes)
{
}
/// <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>
/// 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);
}
}
/// <summary>
/// Marks the type as created and removes all the history until this type from the request path.
/// </summary>
/// <param name="typeRequestInfo">The type request info.</param>
/// <exception cref="ArgumentNullException">The <paramref name="typeRequestInfo"/> is <c>null</c>.</exception>
public void MarkTypeAsCreated(TypeRequestInfo typeRequestInfo)
{
Argument.IsNotNull("typeRequestInfo", typeRequestInfo);
for (int i = _typePath.Count - 1; i >= 0; i--)
{
if (_typePath[i] == typeRequestInfo)
{
_typePath.RemoveRange(i, _typePath.Count - i);
return;
}
}
}
/// <summary>
/// Adds the type to the type path.
/// </summary>
/// <param name="typeRequestInfo">The type request info.</param>
/// <param name="throwExceptionForDuplicateTypes">If set to <c>true</c>, this method will throw a <see cref="CircularDependencyException" /> for duplicate types.</param>
/// <param name="ignoreValueTypes">If set to <c>true</c>, value types will be ignored.</param>
/// <exception cref="ArgumentNullException">The <paramref name="typeRequestInfo" /> is <c>null</c>.</exception>
/// <exception cref="CircularDependencyException">The type is already in the type path and <paramref name="throwExceptionForDuplicateTypes" /> is <c>true</c>.</exception>
private void PushType(TypeRequestInfo typeRequestInfo, bool throwExceptionForDuplicateTypes, bool ignoreValueTypes)
{
Argument.IsNotNull("typeRequestInfo", typeRequestInfo);
if (ignoreValueTypes)
{
if (typeRequestInfo.Type.IsValueTypeEx())
{
return;
}
}
var lastTypeRequest = _typePath.LastOrDefault();
if (lastTypeRequest == typeRequestInfo)
{
Log.Debug("Requesting type {0} twice after eachother, ignoring second request", typeRequestInfo);
return;
}
bool alreadyContainsType = _typePath.Contains(typeRequestInfo);
_typePath.Add(typeRequestInfo);
if (throwExceptionForDuplicateTypes)
{
if (alreadyContainsType)
{
string error = string.Format("Found a circular dependency while resolving '{0}', it is used by '{1}'", FirstType, _typePath[_typePath.Count - 2]);
Log.Error(error);
throw new CircularDependencyException(this, string.Format("{0}. For more information, view the enclosed TypeRequestPath", error));
}
}
}
/// <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>
/// Pushes the type to the type path.
/// </summary>
/// <param name="typeRequestInfo">The type request info.</param>
/// <param name="throwExceptionForDuplicateTypes">If set to <c>true</c>, this method will throw a <see cref="CircularDependencyException"/> for duplicate types.</param>
/// <exception cref="ArgumentNullException">The <paramref name="typeRequestInfo"/> is <c>null</c>.</exception>
/// <exception cref="CircularDependencyException">The type is already in the type path and <paramref name="throwExceptionForDuplicateTypes"/> is <c>true</c>.</exception>
public void PushType(TypeRequestInfo typeRequestInfo, bool throwExceptionForDuplicateTypes)
{
PushType(typeRequestInfo, throwExceptionForDuplicateTypes, IgnoreValueTypes);
}
/// <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>
/// Pushes the type to the type path.
/// </summary>
/// <param name="typeRequestInfo">The type request info.</param>
/// <param name="throwExceptionForDuplicateTypes">If set to <c>true</c>, this method will throw a <see cref="CircularDependencyException"/> for duplicate types.</param>
/// <exception cref="ArgumentNullException">The <paramref name="typeRequestInfo"/> is <c>null</c>.</exception>
/// <exception cref="CircularDependencyException">The type is already in the type path and <paramref name="throwExceptionForDuplicateTypes"/> is <c>true</c>.</exception>
public void PushType(TypeRequestInfo typeRequestInfo, bool throwExceptionForDuplicateTypes)
{
PushType(typeRequestInfo, throwExceptionForDuplicateTypes, IgnoreValueTypes);
}
/// <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>
/// Adds the type to the type path.
/// </summary>
/// <param name="typeRequestInfo">The type request info.</param>
/// <param name="throwExceptionForDuplicateTypes">If set to <c>true</c>, this method will throw a <see cref="CircularDependencyException" /> for duplicate types.</param>
/// <param name="ignoreValueTypes">If set to <c>true</c>, value types will be ignored.</param>
/// <exception cref="ArgumentNullException">The <paramref name="typeRequestInfo" /> is <c>null</c>.</exception>
/// <exception cref="CircularDependencyException">The type is already in the type path and <paramref name="throwExceptionForDuplicateTypes" /> is <c>true</c>.</exception>
private void PushType(TypeRequestInfo typeRequestInfo, bool throwExceptionForDuplicateTypes, bool ignoreValueTypes)
{
Argument.IsNotNull("typeRequestInfo", typeRequestInfo);
if (ignoreValueTypes)
{
if (typeRequestInfo.Type.IsValueTypeEx())
{
return;
}
}
var lastTypeRequest = _typePath.LastOrDefault();
if ((lastTypeRequest == typeRequestInfo) && IgnoreDuplicateRequestsDirectlyAfterEachother)
{
Log.Debug("Requesting type {0} twice after eachother, ignoring second request", typeRequestInfo);
return;
}
bool alreadyContainsType = _typePath.Contains(typeRequestInfo);
_typePath.Add(typeRequestInfo);
if (throwExceptionForDuplicateTypes)
{
ThrowsExceptionIfInvalid();
}
}
/// <summary>
/// Initializes a new instance of the <see cref="TypeRequestPath"/> class.
/// </summary>
/// <param name="typeRequestInfo">The type request info.</param>
/// <param name="ignoreValueTypes">If set to <c>true</c>, this type path will ignore value types.</param>
/// <exception cref="ArgumentNullException">The <paramref name="typeRequestInfo" /> is <c>null</c>.</exception>
public TypeRequestPath(TypeRequestInfo typeRequestInfo, bool ignoreValueTypes = true)
: this(new [] { typeRequestInfo }, ignoreValueTypes) { }
/// <summary>
/// Initializes a new instance of the <see cref="TypeRequestPath" /> class.
/// </summary>
/// <param name="typeRequestInfo">The type request info.</param>
/// <param name="ignoreValueTypes">If set to <c>true</c>, this type path will ignore value types.</param>
/// <param name="name">The name, can be <c>null</c>.</param>
/// <exception cref="ArgumentNullException">The <paramref name="typeRequestInfo" /> is <c>null</c>.</exception>
public TypeRequestPath(TypeRequestInfo typeRequestInfo, bool ignoreValueTypes = true, string name = null)
: this(new [] { typeRequestInfo }, ignoreValueTypes, name) { }
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>
/// 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>
/// Initializes a new instance of the <see cref="TypeRequestPath" /> class.
/// </summary>
/// <param name="typeRequestInfo">The type request info.</param>
/// <param name="ignoreValueTypes">If set to <c>true</c>, this type path will ignore value types.</param>
/// <param name="name">The name, can be <c>null</c>.</param>
/// <exception cref="ArgumentNullException">The <paramref name="typeRequestInfo" /> is <c>null</c>.</exception>
public TypeRequestPath(TypeRequestInfo typeRequestInfo, bool ignoreValueTypes = true, string name = null)
: this(new [] { typeRequestInfo }, ignoreValueTypes, name)
{
}
/// <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;
}
}
