public static InterfaceDescriptor Get(Type type)
{
if (!Cache.TryGetValue(type, out var desc))
{
Cache.TryAdd(type, desc = new InterfaceDescriptor(type));
}
return(desc);
}
private static EntangledTypeProxyDescriptor ConstructLocalProxy <T>() where T : class/*, IEntangledObject*/
{
var typeInfo = typeof(T).GetTypeInfo();
if (!typeInfo.IsInterface || !typeInfo.IsPublic)
{
throw new ArgumentException("The provided type must be a public interface");
}
var elo = typeof(EntangledLocalObjectBase);
var desc = new InterfaceDescriptor(typeof(T));
var guid = typeInfo.GUID;
var type = DynamicAssembly.DynamicModule.DefineType($"T{guid.ToString()}", TypeAttributes.Class | TypeAttributes.Public,
elo);
type.AddInterfaceImplementation(typeof(T));
var executeMethod =
elo.GetMethod("ExecuteMethod",
BindingFlags.Public | BindingFlags.Instance);
var executeMethodVoid =
elo.GetMethod("ExecuteMethodVoid",
BindingFlags.Public | BindingFlags.Instance);
var executeMethodSync = elo.GetMethod("ExecuteMethodSync", BindingFlags.Public | BindingFlags.Instance);
var executeMethodVoidSync =
elo.GetMethod("ExecuteMethodVoidSync", BindingFlags.Public | BindingFlags.Instance);
type.FillBaseConstructors(elo);
foreach (var methods in desc.Methods)
{
int methodOverloadId = 0;
foreach (var method in methods.Value)
{
var parameters = method.Method.GetParameters();
var m = type.DefineMethod(method.Method.Name, MethodAttributes.Public | MethodAttributes.Virtual,
method.Method.CallingConvention, method.Method.ReturnType,
method.Method.GetParameters().Select(p => p.ParameterType).ToArray());
var i = m.GetILGenerator();
i.Emit(OpCodes.Ldarg_0);
i.EmitLdci4(methodOverloadId++);
i.Emit(OpCodes.Ldstr, method.Method.Name);
//emit the object[] array to hold the parameters
if ((parameters?.Length ?? 0) == 0)
{
i.Emit(OpCodes.Ldnull);
}
else
{
i.EmitLdci4((byte)parameters.Length);
i.Emit(OpCodes.Newarr, typeof(object));
for (byte l = 0; l < parameters.Length; l++)
{
i.Emit(OpCodes.Dup);
i.EmitLdci4(l);
i.EmitLdarg((byte)(l + 1));
if (parameters[l].ParameterType.GetTypeInfo().IsValueType)
{
i.Emit(OpCodes.Box, parameters[l].ParameterType);
}
i.Emit(OpCodes.Stelem_Ref);
}
}
if (method.RealReturnType == typeof(void))
{
i.Emit(OpCodes.Call, method.IsAsync ? executeMethodVoid : executeMethodVoidSync);
}
else
{
i.Emit(OpCodes.Call, (method.IsAsync ? executeMethod : executeMethodSync).MakeGenericMethod(method.RealReturnType));
}
i.Emit(OpCodes.Ret);
//important: OVERRIDE THE INTERFACE [abstract] IMPLEMENTATION
type.DefineMethodOverride(m, method.Method);
}
}
//implement getters
var generatedProperties = new Queue <string>();
foreach (var propItem in desc.Properties)
{
var prop = propItem.Value.Property;
var baseProp = typeof(EntangledLocalObjectBase).GetProperty(propItem.Key,
BindingFlags.Instance | BindingFlags.FlattenHierarchy | BindingFlags.Public);
if (baseProp != null && !baseProp.GetGetMethod().IsAbstract)
{
continue;
}
var definedGetter = prop.GetGetMethod();
var field = type.DefineField($"_{prop.Name}", prop.PropertyType, FieldAttributes.Private);
propItem.Value.BackingField = field;
var getProp = type.DefineProperty(prop.Name, PropertyAttributes.None, prop.PropertyType, null);
var getter = type.DefineMethod($"get_{prop.Name}",
MethodAttributes.Public | MethodAttributes.SpecialName | MethodAttributes.Virtual,
definedGetter.ReturnType, null);
var il = getter.GetILGenerator();
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Ldfld, field);
il.Emit(OpCodes.Ret);
getProp.SetGetMethod(getter);
type.DefineMethodOverride(getter, definedGetter);
generatedProperties.Enqueue(propItem.Key);
}
foreach (var ev in desc.Events)
{
type.ImplementEvent(ev.Value.Event.DeclaringType.GetTypeInfo(), ev.Key);
}
var result =
new EntangledTypeProxyDescriptor {
GeneratedType = type.CreateTypeInfo().AsType(), Interface = desc
};
foreach (var ev in desc.Events)
{
ev.Value.BackingField =
result.GeneratedType.GetField(ev.Key, BindingFlags.NonPublic | BindingFlags.Instance);
ev.Value.InvokerDelegate = CreateEventInvokerDelegate(type, ev.Value, typeof(T));
}
while (generatedProperties.Any())
{
var prop = generatedProperties.Dequeue();
desc.Properties[prop].BackingField = result.GeneratedType.GetField($"_{prop}",
BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.FlattenHierarchy);
}
return(result);
}
