public object Cast(IAddressable grain, Type interfaceType)
{
GrainReferenceCaster caster;
if (!this.casters.TryGetValue(interfaceType, out caster))
{
// Create and cache a caster for the interface type.
caster = this.casters.GetOrAdd(interfaceType, MakeCaster);
}
return(caster(grain));
GrainReferenceCaster MakeCaster(Type interfaceType)
{
var grainReferenceType = this.typeCache.GetGrainReferenceType(interfaceType);
return(GrainCasterFactory.CreateGrainReferenceCaster(interfaceType, grainReferenceType));
}
}
private static GrainReferenceCaster MakeCaster(Type interfaceType)
{
var typeInfo = interfaceType.GetTypeInfo();
CodeGeneratorManager.GenerateAndCacheCodeForAssembly(typeInfo.Assembly);
var genericInterfaceType = interfaceType.IsConstructedGenericType
? typeInfo.GetGenericTypeDefinition()
: interfaceType;
if (!typeof(IAddressable).IsAssignableFrom(interfaceType))
{
throw new InvalidCastException(
$"Target interface must be derived from Orleans.IAddressable - cannot handle {interfaceType}");
}
// Try to find the correct GrainReference type for this interface.
Type grainReferenceType;
if (!GrainToReferenceMapping.TryGetValue(genericInterfaceType, out grainReferenceType))
{
throw new InvalidOperationException(
$"Cannot find generated GrainReference class for interface '{interfaceType}'");
}
if (interfaceType.IsConstructedGenericType)
{
grainReferenceType = grainReferenceType.MakeGenericType(typeInfo.GenericTypeArguments);
}
if (!typeof(IAddressable).IsAssignableFrom(grainReferenceType))
{
// This represents an internal programming error.
throw new InvalidCastException(
$"Target reference type must be derived from Orleans.IAddressable - cannot handle {grainReferenceType}");
}
return(GrainCasterFactory.CreateGrainReferenceCaster(interfaceType, grainReferenceType));
}
/// <summary>
/// Creates and returns a new grain reference caster.
/// </summary>
/// <param name="interfaceType">The interface which the result will cast to.</param>
/// <returns>A new grain reference caster.</returns>
private GrainReferenceCaster MakeCaster(Type interfaceType)
{
var grainReferenceType = this.typeCache.GetGrainReferenceType(interfaceType);
return(GrainCasterFactory.CreateGrainReferenceCaster(interfaceType, grainReferenceType));
}