Events can be created on the fly from interfaces without first defining an explicit class implementing the interfaces. This is a useful technique to support multiple inheritance for polymorphic routing scenarios to make systems more resilient and maintainable over time.
Sending interface messages
Interface messages can be sent using the following syntax:
await endpoint.Send<IMyMessage>(message =>
{
message.SomeProperty = "Hello world";
});
Replies are supported via:
return context.Reply<IMyReply>(message =>
{
message.SomeProperty = "Hello world";
});
Publishing interface messages
Interface messages can be published using the following syntax:
return context.Publish<IMyEvent>(message =>
{
message.SomeProperty = "Hello world";
});
Creating interface messages with IMessageCreator
If an interface message is needed before calling Send or Publish, use IMessageCreator directly to create the message instance:
//IMessageCreator is available via dependency injection
async Task PublishEvent(IMessageCreator messageCreator)
{
var eventMessage = messageCreator.CreateInstance<IMyEvent>(message =>
{
message.SomeProperty = "Hello world";
});
await messageSession.Publish(eventMessage);
//or if on a message handler
await context.Publish(eventMessage);
}