public RuntimePartLifecycleTracker(RuntimeExportProvider owningExportProvider, RuntimeComposition.RuntimePart partDefinition, IReadOnlyDictionary <string, object?> importMetadata, PartLifecycleTracker nonSharedPartOwner)
: base(owningExportProvider, nonSharedPartOwner)
{
Requires.NotNull(partDefinition, nameof(partDefinition));
Requires.NotNull(importMetadata, nameof(importMetadata));
this.partDefinition = partDefinition;
this.importMetadata = importMetadata;
}
private bool TryHandleGetExportProvider(RuntimeComposition.RuntimePart exportingRuntimePart, bool lazy, out object?exportProvider)
{
Requires.NotNull(exportingRuntimePart, nameof(exportingRuntimePart));
// Special case importing of ExportProvider
if (exportingRuntimePart.TypeRef.Equals(ExportProvider.ExportProviderPartDefinition.TypeRef))
{
exportProvider = lazy ? () => this.NonDisposableWrapper.Value :
this.NonDisposableWrapper.Value;
return(true);
}
exportProvider = null;
return(false);
}
/// <summary>
/// Gets the constructed type (non generic type definition) for a part.
/// </summary>
private static Reflection.TypeRef GetPartConstructedTypeRef(RuntimeComposition.RuntimePart part, IReadOnlyDictionary <string, object?> importMetadata)
{
Requires.NotNull(part, nameof(part));
Requires.NotNull(importMetadata, nameof(importMetadata));
if (part.TypeRef.IsGenericTypeDefinition)
{
var bareMetadata = LazyMetadataWrapper.TryUnwrap(importMetadata);
object?typeArgsObject;
if (bareMetadata.TryGetValue(CompositionConstants.GenericParametersMetadataName, out typeArgsObject) && typeArgsObject is object)
{
IEnumerable <TypeRef> typeArgs = typeArgsObject is LazyMetadataWrapper.TypeArraySubstitution
? ((LazyMetadataWrapper.TypeArraySubstitution)typeArgsObject).TypeRefArray
: ReflectionHelpers.TypesToTypeRefs((Type[])typeArgsObject, part.TypeRef.Resolver);
return(part.TypeRef.MakeGenericTypeRef(typeArgs.ToImmutableArray()));
}
}
return(part.TypeRef);
}
private void Write(RuntimeComposition.RuntimePart part)
{
using (this.Trace("RuntimePart"))
{
this.Write(part.TypeRef);
this.Write(part.Exports, this.Write);
if (part.ImportingConstructorOrFactoryMethodRef == null)
{
this.writer !.Write(false);
}
else
{
this.writer !.Write(true);
this.Write(part.ImportingConstructorOrFactoryMethodRef);
this.Write(part.ImportingConstructorArguments, this.Write);
}
this.Write(part.ImportingMembers, this.Write);
this.Write(part.OnImportsSatisfiedMethodRefs, this.Write);
this.Write(part.SharingBoundary);
}
}
/// <summary>
/// Called from <see cref="GetExportedValue(RuntimeComposition.RuntimeImport, RuntimeComposition.RuntimeExport, RuntimePartLifecycleTracker)"/>
/// only, as an assisting method. See remarks.
/// </summary>
/// <remarks>
/// This method is separate from its one caller to avoid a csc.exe compiler bug
/// where it captures "this" in the closure for exportedValue, resulting in a memory leak
/// which caused one of our GC unit tests to fail.
/// </remarks>
private ExportedValueConstructor GetExportedValueHelper(RuntimeComposition.RuntimeImport import, RuntimeComposition.RuntimeExport export, RuntimeComposition.RuntimePart exportingRuntimePart, TypeRef originalPartTypeRef, TypeRef constructedPartTypeRef, RuntimePartLifecycleTracker?importingPartTracker)
{
Requires.NotNull(import, nameof(import));
Requires.NotNull(export, nameof(export));
Requires.NotNull(exportingRuntimePart, nameof(exportingRuntimePart));
Requires.NotNull(originalPartTypeRef, nameof(originalPartTypeRef));
Requires.NotNull(constructedPartTypeRef, nameof(constructedPartTypeRef));
bool nonSharedInstanceRequired = !exportingRuntimePart.IsShared || import.IsNonSharedInstanceRequired;
Requires.Argument(importingPartTracker is object || !nonSharedInstanceRequired, nameof(importingPartTracker), "Value required for non-shared parts.");
RuntimePartLifecycleTracker?nonSharedPartOwner = nonSharedInstanceRequired && importingPartTracker !.IsNonShared && !import.IsExportFactory ? importingPartTracker : null;
PartLifecycleTracker partLifecycle = this.GetOrCreateValue(
originalPartTypeRef,
constructedPartTypeRef,
exportingRuntimePart.SharingBoundary,
import.Metadata,
nonSharedInstanceRequired,
nonSharedPartOwner);
var faultCallback = this.faultCallback;
Func <object?> exportedValue = () =>
{
try
{
bool fullyInitializedValueIsRequired = IsFullyInitializedExportRequiredWhenSettingImport(importingPartTracker, import.IsLazy, import.ImportingParameterRef != null);
if (!fullyInitializedValueIsRequired && importingPartTracker != null && !import.IsExportFactory)
{
importingPartTracker.ReportPartiallyInitializedImport(partLifecycle);
}
if (export.MemberRef != null)
{
object?part = export.Member !.IsStatic()
? null
: (fullyInitializedValueIsRequired
? partLifecycle.GetValueReadyToExpose()
: partLifecycle.GetValueReadyToRetrieveExportingMembers());
return(GetValueFromMember(part, export.Member !, import.ImportingSiteElementType, export.ExportedValueTypeRef.Resolve()));
}
private PartLifecycleTracker GetOrCreateValue(RuntimeComposition.RuntimeImport import, RuntimeComposition.RuntimePart exportingRuntimePart, TypeRef originalPartTypeRef, TypeRef constructedPartTypeRef, RuntimePartLifecycleTracker?importingPartTracker)
{
Requires.NotNull(import, nameof(import));
Requires.NotNull(exportingRuntimePart, nameof(exportingRuntimePart));
Requires.NotNull(originalPartTypeRef, nameof(originalPartTypeRef));
Requires.NotNull(constructedPartTypeRef, nameof(constructedPartTypeRef));
bool nonSharedInstanceRequired = !exportingRuntimePart.IsShared || import.IsNonSharedInstanceRequired;
Requires.Argument(importingPartTracker is object || !nonSharedInstanceRequired, nameof(importingPartTracker), "Value required for non-shared parts.");
RuntimePartLifecycleTracker?nonSharedPartOwner = nonSharedInstanceRequired && importingPartTracker !.IsNonShared && !import.IsExportFactory ? importingPartTracker : null;
return(this.GetOrCreateValue(
originalPartTypeRef,
constructedPartTypeRef,
exportingRuntimePart.SharingBoundary,
import.Metadata,
nonSharedInstanceRequired,
nonSharedPartOwner));
}
/// <summary>
/// Called from <see cref="GetExportedValue(RuntimeComposition.RuntimeImport, RuntimeComposition.RuntimeExport, RuntimePartLifecycleTracker)"/>
/// only, as an assisting method. See remarks.
/// </summary>
/// <remarks>
/// This method is separate from its one caller to avoid a csc.exe compiler bug
/// where it captures "this" in the closure for exportedValue, resulting in a memory leak
/// which caused one of our GC unit tests to fail.
/// </remarks>
private ExportedValueConstructor GetExportedValueHelper(RuntimeComposition.RuntimeImport import, RuntimeComposition.RuntimeExport export, RuntimeComposition.RuntimePart exportingRuntimePart, TypeRef originalPartTypeRef, TypeRef constructedPartTypeRef, RuntimePartLifecycleTracker importingPartTracker)
{
Requires.NotNull(import, nameof(import));
Requires.NotNull(export, nameof(export));
Requires.NotNull(exportingRuntimePart, nameof(exportingRuntimePart));
Requires.NotNull(originalPartTypeRef, nameof(originalPartTypeRef));
Requires.NotNull(constructedPartTypeRef, nameof(constructedPartTypeRef));
PartLifecycleTracker partLifecycle = this.GetOrCreateValue(
originalPartTypeRef,
constructedPartTypeRef,
exportingRuntimePart.SharingBoundary,
import.Metadata,
!exportingRuntimePart.IsShared || import.IsNonSharedInstanceRequired);
var faultCallback = this.faultCallback;
Func <object> exportedValue = () =>
{
try
{
bool fullyInitializedValueIsRequired = IsFullyInitializedExportRequiredWhenSettingImport(importingPartTracker, import.IsLazy, import.ImportingParameterRef != null);
if (!fullyInitializedValueIsRequired && importingPartTracker != null && !import.IsExportFactory)
{
importingPartTracker.ReportPartiallyInitializedImport(partLifecycle);
}
if (export.MemberRef != null)
{
object part = export.Member.IsStatic()
? null
: (fullyInitializedValueIsRequired
? partLifecycle.GetValueReadyToExpose()
: partLifecycle.GetValueReadyToRetrieveExportingMembers());
return(GetValueFromMember(part, export.Member, import.ImportingSiteElementType, export.ExportedValueTypeRef.Resolve()));
}
else
{
return(fullyInitializedValueIsRequired
? partLifecycle.GetValueReadyToExpose()
: partLifecycle.GetValueReadyToRetrieveExportingMembers());
}
}
catch (Exception e)
{
// Let the MEF host know that an exception has been thrown while resolving an exported value
faultCallback?.Invoke(e, import, export);
throw;
}
};
return(new ExportedValueConstructor(partLifecycle, exportedValue));
}
