public ObserverGrain()
{
GrainType = GetType();
var handlerAttributes = GrainType.GetCustomAttributes(typeof(HandlerAttribute), false);
if (handlerAttributes.Length > 0)
{
handlerAttribute = (HandlerAttribute)handlerAttributes[0];
}
else
{
handlerAttribute = default;
}
foreach (var method in GrainType.GetMethods())
{
var parameters = method.GetParameters();
if (parameters.Length >= 1 &&
typeof(IEvent).IsAssignableFrom(parameters[0].ParameterType))
{
var evtType = parameters[0].ParameterType;
if (parameters.Length == 2 && parameters[1].ParameterType == typeof(EventBase))
{
var dynamicMethod = new DynamicMethod($"{evtType.Name}_handler", typeof(Task), new Type[] { typeof(object), typeof(IEvent), typeof(EventBase) }, GrainType, true);
var ilGen = dynamicMethod.GetILGenerator();//IL生成器
ilGen.DeclareLocal(evtType);
ilGen.Emit(OpCodes.Ldarg_1);
ilGen.Emit(OpCodes.Castclass, evtType);
ilGen.Emit(OpCodes.Stloc_0);
ilGen.Emit(OpCodes.Ldarg_0);
ilGen.Emit(OpCodes.Ldloc_0);
ilGen.Emit(OpCodes.Ldarg_2);
ilGen.Emit(OpCodes.Call, method);
ilGen.Emit(OpCodes.Ret);
var func = (Func <object, IEvent, EventBase, Task>)dynamicMethod.CreateDelegate(typeof(Func <object, IEvent, EventBase, Task>));
_handlerDict_1.Add(evtType, func);
}
else
{
var dynamicMethod = new DynamicMethod($"{evtType.Name}_handler", typeof(Task), new Type[] { typeof(object), typeof(IEvent) }, GrainType, true);
var ilGen = dynamicMethod.GetILGenerator();//IL生成器
ilGen.DeclareLocal(evtType);
ilGen.Emit(OpCodes.Ldarg_1);
ilGen.Emit(OpCodes.Castclass, evtType);
ilGen.Emit(OpCodes.Stloc_0);
ilGen.Emit(OpCodes.Ldarg_0);
ilGen.Emit(OpCodes.Ldloc_0);
ilGen.Emit(OpCodes.Call, method);
ilGen.Emit(OpCodes.Ret);
var func = (Func <object, IEvent, Task>)dynamicMethod.CreateDelegate(typeof(Func <object, IEvent, Task>));
_handlerDict_0.Add(evtType, func);
}
}
}
}
