static public IAdvice Boundary <T>(this Advisor.IBasic basic)
where T : Advice.IBoundary, new()
{
throw new NotImplementedException();
// create a method to wrap entire call!
// create a structure to store arguments, exception & return and implements IBefore/IAfter
// (1) store as local the new structure
// (2) on start instantiate Boundary with newobj if it is a class.
// (3) call before first and give structure as argument
// (4) try catch finally => call after in finally and check if exception != null => throw it or return value from structure!
// voilà!
// for async method : find AsyncMachineStructure
// find field where IBoundary.Factory is stored.
// replace factory! by Factory<T>
//return new Advice((_Method, _Pointer) =>
//{
// var _type = _Method.Type();
// var _signature = _Method.Signature();
// var _routine = new Closure.Routine(_Pointer, _signature, _type);
// var _method = new DynamicMethod(string.Empty, _type, _signature, _Method.DeclaringType, true);
// var _body = _method.GetILGenerator();
// if (_type == Metadata.Void)
// {
// if (advice.Target != null) { _body.Emit(OpCodes.Ldsfld, Advisor.Module.DefineField(advice.Target)); }
// _body.Emit(_signature, false);
// _body.Emit(OpCodes.Newobj, _routine.Constructor);
// _body.Emit(OpCodes.Ldftn, _routine.Method);
// _body.Emit(OpCodes.Newobj, Metadata<Action>.Type.GetConstructors().Single());
// _body.Emit(OpCodes.Call, advice.Method);
// }
// else
// {
// _body.DeclareLocal(_routine.Type);
// if (advice.Target != null) { _body.Emit(OpCodes.Ldsfld, Advisor.Module.DefineField(advice.Target)); }
// _body.Emit(_signature, false);
// _body.Emit(OpCodes.Newobj, _routine.Constructor);
// _body.Emit(OpCodes.Stloc_0);
// _body.Emit(OpCodes.Ldloc_0);
// _body.Emit(OpCodes.Ldftn, _routine.Method);
// _body.Emit(OpCodes.Newobj, Metadata<Action>.Type.GetConstructors().Single());
// _body.Emit(OpCodes.Call, advice.Method);
// _body.Emit(OpCodes.Ldloc_0);
// _body.Emit(OpCodes.Ldfld, _routine.Value);
// }
// _body.Emit(OpCodes.Ret);
// _method.Prepare();
// return _method;
//});
}
/// <summary>
/// Create an advice that runs before and after the advised method.
/// </summary>
/// <param name="basic">Basic</param>
/// <param name="advice">Delegate to be invoked instead of the advised method : Action(object = [target instance of advised method call], object[] = [boxed arguments used to call advised method], Action = [delegate that invokes the advised method body])</param>
/// <returns>Advice</returns>
static public IAdvice Around(this Advisor.IBasic basic, Action <object, object[], Action> advice)
{
return(new Advice((_Method, _Pointer) =>
{
var _type = _Method.Type();
var _signature = _Method.Signature();
var _routine = new Closure.Routine(_Pointer, _signature, _type);
var _method = new DynamicMethod(string.Empty, _type, _signature, _Method.DeclaringType, true);
var _body = _method.GetILGenerator();
if (_type == Metadata.Void)
{
if (advice.Target != null)
{
_body.Emit(OpCodes.Ldsfld, Advisor.Module.DefineField(advice.Target));
}
_body.Emit(_signature, true);
_body.Emit(_signature, false);
_body.Emit(OpCodes.Newobj, _routine.Constructor);
_body.Emit(OpCodes.Ldftn, _routine.Method);
_body.Emit(OpCodes.Newobj, Metadata <Action> .Type.GetConstructors().Single());
_body.Emit(OpCodes.Call, advice.Method);
}
else
{
_body.DeclareLocal(_routine.Type);
if (advice.Target != null)
{
_body.Emit(OpCodes.Ldsfld, Advisor.Module.DefineField(advice.Target));
}
_body.Emit(_signature, true);
_body.Emit(_signature, false);
_body.Emit(OpCodes.Newobj, _routine.Constructor);
_body.Emit(OpCodes.Stloc_0);
_body.Emit(OpCodes.Ldloc_0);
_body.Emit(OpCodes.Ldftn, _routine.Method);
_body.Emit(OpCodes.Newobj, Metadata <Action> .Type.GetConstructors().Single());
_body.Emit(OpCodes.Call, advice.Method);
_body.Emit(OpCodes.Ldloc_0);
_body.Emit(OpCodes.Ldfld, _routine.Value);
}
_body.Emit(OpCodes.Ret);
_method.Prepare();
return _method;
}));
}
/// <summary>
/// Create an advice that runs before the advised method.
/// </summary>
/// <param name="basic">Basic</param>
/// <param name="advice">Delegate to be invoked before the advised method</param>
/// <returns>Advice</returns>
static public IAdvice Before(this Advisor.IBasic basic, Action advice)
{
return(new Advice((_Method, _Pointer) =>
{
var _signature = _Method.Signature();
var _method = new DynamicMethod(string.Empty, _Method.ReturnType, _signature, _Method.DeclaringType, true);
var _body = _method.GetILGenerator();
if (advice.Target != null)
{
_body.Emit(OpCodes.Ldsfld, Advisor.Module.DefineField(advice.Target));
}
_body.Emit(OpCodes.Call, advice.Method);
_body.Emit(_signature, false);
_body.Emit(_Pointer, _Method.ReturnType, _signature);
_body.Emit(OpCodes.Ret);
_method.Prepare();
return _method;
}));
}
/// <summary>
/// Create an advice that runs before and after the advised method.
/// </summary>
/// <typeparam name="T">Resource to create before and dispose after method execution</typeparam>
/// <param name="basic">Basic</param>
/// <returns>Advice</returns>
static public IAdvice Around <T>(this Advisor.IBasic basic)
where T : class, IDisposable, new()
{
return(new Advice((_Method, _Pointer) =>
{
var _type = _Method.Type();
var _signature = _Method.Signature();
var _method = new DynamicMethod(string.Empty, _type, _signature, _Method.DeclaringType, true);
var _body = _method.GetILGenerator();
_body.DeclareLocal(Metadata <T> .Type);
if (_type == Metadata.Void)
{
_body.BeginExceptionBlock();
_body.Emit(OpCodes.Newobj, Metadata.Constructor(() => new T()));
_body.Emit(OpCodes.Stloc_0);
_body.Emit(_signature, false);
_body.Emit(_Pointer, _type, _signature);
_body.BeginFinallyBlock();
_body.Emit(OpCodes.Ldloc_0);
_body.Emit(OpCodes.Callvirt, Metadata <IDisposable> .Method(_Disposable => _Disposable.Dispose()));
_body.EndExceptionBlock();
}
else
{
_body.DeclareLocal(_type);
_body.BeginExceptionBlock();
_body.Emit(OpCodes.Newobj, Metadata.Constructor(() => new T()));
_body.Emit(OpCodes.Stloc_0);
_body.Emit(_signature, false);
_body.Emit(_Pointer, _type, _signature);
_body.Emit(OpCodes.Stloc_1);
_body.BeginFinallyBlock();
_body.Emit(OpCodes.Ldloc_0);
_body.Emit(OpCodes.Callvirt, Metadata <IDisposable> .Method(_Disposable => _Disposable.Dispose()));
_body.EndExceptionBlock();
_body.Emit(OpCodes.Ldloc_1);
}
_body.Emit(OpCodes.Ret);
_method.Prepare();
return _method;
}));
}
/// <summary>
/// Create an advice that runs before and after the advised method.
/// </summary>
/// <param name="basic">Basic</param>
/// <param name="advice">Delegate to be invoked instead of the advised method : Func(object = [target instance of advised method call], object[] = [boxed arguments used to call advised method], Func() = [delegate that invokes advised method body (return boxed return value or null if return type is void)]) return boxed return value (null if return type is void)</param>
/// <returns>Advice</returns>
static public IAdvice Around(this Advisor.IBasic basic, Func <object, object[], Func <object>, object> advice)
{
return(new Advice((_Method, _Pointer) =>
{
var _type = _Method.Type();
var _signature = _Method.Signature();
var _function = new Closure.Function(_Pointer, _signature, _type);
var _method = new DynamicMethod(string.Empty, _type, _signature, _Method.DeclaringType, true);
var _body = _method.GetILGenerator();
if (advice.Target != null)
{
_body.Emit(OpCodes.Ldsfld, Advisor.Module.DefineField(advice.Target));
}
_body.Emit(_signature, true);
_body.Emit(_signature, false);
_body.Emit(OpCodes.Newobj, _function.Constructor);
_body.Emit(OpCodes.Ldftn, _function.Method);
_body.Emit(OpCodes.Newobj, Metadata <Func <object> > .Type.GetConstructors().Single());
_body.Emit(OpCodes.Call, advice.Method);
if (_type == Metadata.Void)
{
_body.Emit(OpCodes.Pop);
}
else
{
if (_type.IsValueType)
{
_body.Emit(OpCodes.Unbox_Any, _type);
}
else
{
_body.Emit(OpCodes.Castclass, _type);
}
}
_body.Emit(OpCodes.Ret);
_method.Prepare();
return _method;
}));
}
/// <summary>
/// Create an advice that runs after the advised method regardless of its outcome.
/// </summary>
/// <param name="basic">Basic</param>
/// <param name="advice">Delegate to be invoked after the advised method</param>
/// <returns>Advice</returns>
static public IAdvice After(this Advisor.IBasic basic, Action advice)
{
return(new Advice((_Method, _Pointer) =>
{
var _type = _Method.ReturnType();
var _signature = _Method.Signature();
var _method = new DynamicMethod(string.Empty, _type, _signature, _Method.DeclaringType, true);
var _body = _method.GetILGenerator();
_body.DeclareLocal(Metadata <bool> .Type);
var _realized = _body.DefineLabel();
if (_type == Metadata.Void)
{
_body.BeginExceptionBlock();
_body.Emit(_signature, false);
_body.Emit(_Pointer, _type, _signature);
_body.Emit(OpCodes.Ldc_I4_1);
_body.Emit(OpCodes.Stloc_0);
if (advice.Target != null)
{
_body.Emit(OpCodes.Ldsfld, Advisor.Module.DefineField(advice.Target));
}
_body.Emit(OpCodes.Call, advice.Method);
_body.BeginCatchBlock(Metadata <Exception> .Type);
_body.Emit(OpCodes.Pop);
_body.Emit(OpCodes.Ldloc_0);
_body.Emit(OpCodes.Brtrue, _realized);
if (advice.Target != null)
{
_body.Emit(OpCodes.Ldsfld, Advisor.Module.DefineField(advice.Target));
}
_body.Emit(OpCodes.Call, advice.Method);
_body.MarkLabel(_realized);
_body.Emit(OpCodes.Rethrow);
_body.EndExceptionBlock();
}
else
{
_body.DeclareLocal(_type);
_body.BeginExceptionBlock();
_body.Emit(_signature, false);
_body.Emit(_Pointer, _type, _signature);
_body.Emit(OpCodes.Stloc_1);
_body.Emit(OpCodes.Ldc_I4_1);
_body.Emit(OpCodes.Stloc_0);
if (advice.Target != null)
{
_body.Emit(OpCodes.Ldsfld, Advisor.Module.DefineField(advice.Target));
}
_body.Emit(OpCodes.Call, advice.Method);
_body.BeginCatchBlock(Metadata <Exception> .Type);
_body.Emit(OpCodes.Pop);
_body.Emit(OpCodes.Ldloc_0);
_body.Emit(OpCodes.Brtrue, _realized);
if (advice.Target != null)
{
_body.Emit(OpCodes.Ldsfld, Advisor.Module.DefineField(advice.Target));
}
_body.Emit(OpCodes.Call, advice.Method);
_body.MarkLabel(_realized);
_body.Emit(OpCodes.Rethrow);
_body.EndExceptionBlock();
_body.Emit(OpCodes.Ldloc_1);
}
_body.Emit(OpCodes.Ret);
_method.Prepare();
return _method;
}));
}
/// <summary>
/// After
/// </summary>
/// <param name="basic">Basic</param>
/// <returns>After</returns>
static public Advisor.Basic.IAfter After(this Advisor.IBasic basic)
{
return(null);
}