public virtual IConsumer Resolve(ConsumerDescriptor descriptor)
{
if (descriptor.PluginDescriptor == null || IsActiveForStore(descriptor.PluginDescriptor))
{
return(_container.Value.ResolveKeyed <IConsumer>(descriptor.ContainerType));
}
return(null);
}
public ConsumerRegistry(IEnumerable <Lazy <IConsumer, EventConsumerMetadata> > consumers)
{
foreach (var consumer in consumers)
{
var metadata = consumer.Metadata;
if (!metadata.IsActive)
{
continue;
}
var methods = FindMethods(metadata);
var messageTypes = new Dictionary <Type, MethodInfo>();
foreach (var method in methods)
{
var descriptor = new ConsumerDescriptor(metadata)
{
IsAsync = method.ReturnType == typeof(Task),
FireForget = method.HasAttribute <FireForgetAttribute>(false)
};
//if (descriptor.IsAsync && descriptor.FireForget)
//{
// throw new NotSupportedException($"An asynchronous message consumer method cannot be called as fire & forget. Method: '{method}'.");
//}
if (method.ReturnType != typeof(Task) && method.ReturnType != typeof(void))
{
throw new NotSupportedException($"A message consumer method's return type must either be 'void' or '${typeof(Task).FullName}'. Method: '{method}'.");
}
if (method.Name.EndsWith("Async") && !descriptor.IsAsync)
{
throw new NotSupportedException($"A synchronous message consumer method name should not end with 'Async'. Method: '{method}'.");
}
var parameters = method.GetParameters();
if (parameters.Length == 0)
{
throw new NotSupportedException($"A message consumer method must have at least one parameter identifying the message to consume. Method: '{method}'.");
}
if (parameters.Any(x => x.ParameterType.IsByRef || x.IsOut || x.IsOptional))
{
throw new NotSupportedException($"'out', 'ref' and optional parameters are not allowed in consumer methods. Method: '{method}'.");
}
var p = parameters[0];
var messageType = p.ParameterType;
if (messageType.IsGenericType && messageType.GetGenericTypeDefinition() == typeof(ConsumeContext <>))
{
messageType = messageType.GetGenericArguments()[0];
descriptor.WithEnvelope = true;
}
if (messageTypes.TryGetValue(messageType, out var method2))
{
// We won't allow methods with different signatures, but same message type: there can only be one!
throw new AmbigousConsumerException(method2, method);
}
messageTypes.Add(messageType, method);
if (messageType.IsPublic && (messageType.IsClass || messageType.IsInterface))
{
// The method signature is valid: add to dictionary.
descriptor.MessageParameter = p;
descriptor.Parameters = parameters.Skip(1).ToArray();
descriptor.MessageType = messageType;
descriptor.Method = method;
_descriptorMap.Add(messageType, descriptor);
}
else
{
// TODO: message
throw new NotSupportedException();
}
}
}
}
