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Fixed InvalidCastException for Task<T> methods

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This commit is contained in:
Mark van Renswoude 2017-02-10 12:07:34 +01:00
parent ddc9d77a4c
commit b319be8d76
2 changed files with 39 additions and 15 deletions
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27
Tapeti/Default/PublishResultBinding.cs
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@ -1,4 +1,6 @@
using System; using System;
using System.Linq.Expressions;
using System.Reflection;
using System.Threading.Tasks; using System.Threading.Tasks;
using RabbitMQ.Client.Framing; using RabbitMQ.Client.Framing;
using Tapeti.Config; using Tapeti.Config;
@ -15,26 +17,29 @@ namespace Tapeti.Default
if (context.Result.HasHandler) if (context.Result.HasHandler)
return; return;
bool isTask; bool isTask;
if (context.Result.Info.ParameterType.IsTypeOrTaskOf(t => t.IsClass, out isTask)) Type actualType;
{ if (!context.Result.Info.ParameterType.IsTypeOrTaskOf(t => t.IsClass, out isTask, out actualType))
return;
if (isTask) if (isTask)
{ {
var handler = GetType().GetMethod("PublishGenericTaskResult", BindingFlags.NonPublic | BindingFlags.Static).MakeGenericMethod(actualType);
context.Result.SetHandler(async (messageContext, value) => context.Result.SetHandler(async (messageContext, value) =>
{ {
var message = await (Task<object>)value; await (Task)handler.Invoke(null, new[] { messageContext, value });
if (message != null)
await Reply(message, messageContext);
}); });
} }
else else
context.Result.SetHandler((messageContext, value) => context.Result.SetHandler((messageContext, value) =>
value == null ? null : Reply(value, messageContext)); value == null ? null : Reply(value, messageContext));
} }
}
private Task Reply(object message, IMessageContext messageContext) private static Task Reply(object message, IMessageContext messageContext)
{ {
var publisher = (IInternalPublisher)messageContext.DependencyResolver.Resolve<IPublisher>(); var publisher = (IInternalPublisher)messageContext.DependencyResolver.Resolve<IPublisher>();
var properties = new BasicProperties(); var properties = new BasicProperties();
@ -49,5 +54,13 @@ namespace Tapeti.Default
return publisher.Publish(message, properties); return publisher.Publish(message, properties);
} }
private static async Task PublishGenericTaskResult<T>(IMessageContext messageContext, object value) where T : class
{
var message = await (Task<T>)value;
if (message != null)
await Reply(message, messageContext);
}
} }
} }

15
Tapeti/Helpers/TaskTypeHelper.cs
View File

@ -5,21 +5,32 @@ namespace Tapeti.Helpers
{ {
public static class TaskTypeHelper public static class TaskTypeHelper
{ {
public static bool IsTypeOrTaskOf(this Type type, Func<Type, bool> predicate, out bool isTask) public static bool IsTypeOrTaskOf(this Type type, Func<Type, bool> predicate, out bool isTask, out Type actualType)
{ {
if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Task<>)) if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Task<>))
{ {
isTask = true; isTask = true;
var genericArguments = type.GetGenericArguments(); var genericArguments = type.GetGenericArguments();
return genericArguments.Length == 1 && predicate(genericArguments[0]); if (genericArguments.Length == 1 && predicate(genericArguments[0]))
{
actualType = genericArguments[0];
return true;
}
} }
isTask = false; isTask = false;
actualType = type;
return predicate(type); return predicate(type);
} }
public static bool IsTypeOrTaskOf(this Type type, Func<Type, bool> predicate, out bool isTask)
{
Type actualType;
return IsTypeOrTaskOf(type, predicate, out isTask, out actualType);
}
public static bool IsTypeOrTaskOf(this Type type, Type compareTo, out bool isTask) public static bool IsTypeOrTaskOf(this Type type, Type compareTo, out bool isTask)
{ {
return IsTypeOrTaskOf(type, t => t == compareTo, out isTask); return IsTypeOrTaskOf(type, t => t == compareTo, out isTask);