public async Task Dispatch(TransportLevelMessage message)
{
var registration = GetMessageRegistrationFor(message);
var unitOfWork = _unitOfWorkFactory.CreateForHandlerType(registration.HandlerInstanceType);
if (unitOfWork == null)
{
throw new UnableToResolveUnitOfWorkForHandlerException($"Error! Unable to create unit of work for handler type \"{registration.HandlerInstanceType.FullName}\".");
}
var messageInstance = message.ReadDataAs(registration.MessageInstanceType);
var context = new MessageHandlerContext(message.Metadata);
await unitOfWork.Run(async handler =>
{
if (handler == null)
{
throw new InvalidMessageHandlerException($"Error! Message handler of type \"{registration.HandlerInstanceType.FullName}\" not instantiated in unit of work and message instance type of \"{registration.MessageInstanceType}\" for message type \"{registration.MessageType}\" can therefor not be handled.");
}
// TODO -- verify that the handler is in fact an implementation of IMessageHandler<registration.MessageInstanceType> to provider sane error messages.
await ExecuteHandler((dynamic)messageInstance, (dynamic)handler, context);
});
}
private MessageRegistration GetMessageRegistrationFor(TransportLevelMessage message)
{
var messageId = message.Metadata.MessageId;
var messageType = message.Metadata.Type;
var registration = _messageHandlerRegistry.GetRegistrationFor(messageType);
if (registration == null)
{
throw new MissingMessageHandlerRegistrationException($"Error! A handler has not been registered for messages of type \"{messageType}\". Message with id \"{messageId}\" was not handled.");
}
return(registration);
}
private MessageRegistration GetMessageRegistrationFor(TransportLevelMessage message) => _messageHandlerRegistry.GetRegistrationFor(message.Metadata.Type) ?? _fallbackHandler.GetFallback(message.Metadata.Type);
public MessageResult(TransportLevelMessage message, Func <Task> onCommit = null)
{
Message = message;
_onCommit = onCommit ?? EmptyCommitAction;
}
