Duplication of IHandleMessage implementation

[Cattivik73]

I din't find a way to have different classes in different assemblies that implement the same 'kind' of message, I tried with same name and same namespace but nothing. It seems that your implementation reuired that you have a specific assembly in which define the implementation of IHandleMessage . I understand the motivation but this can be a bond from architectural point of view, because it force a reference to Rebus dll. Normally in cominication framework like WCF, or webapi the proxies can be duplicated in different assemblies and this approach, 'less purist' bring a lot of advantages in references.

[mookid8000]

Hi @Cattivik73 , did you close the discussion because you found a solution?

In case you didn't, here's a way to solve your problem 🙂 If I understand you correctly, you would like to have a message type MyMessage e.g. looking like this

record MyMessage(string Text);

in two different assemblies, so your Rebus instances don't have to share a reference to a shared NuGet package/DLL.

Doing that is pretty simple with Rebus: You can just turn on "custom type names", this way forcing Rebus to call MyMessage something specified by you. This can be done like this:

services.AddRebus(
	configure => configure
		.(...)
		.Serialization(s => s.UseCustomMessageTypeNames()
			.AddWithCustomName<MyMessage>("messages/mymessage")
			.AddWithCustomName<AnotherMessage>("messages/anothermessage"))
		.(...)
);

which in this case forcec Rebus to put "messages/mymessage" as the type name for MyMessage in the rbs2-msg-type header. In the receiving end, you need something similar, but you can use whatever type name you like, e.g.

services.AddRebus(
	configure => configure
		.(...)
		.Serialization(s => s.UseCustomMessageTypeNames()
			.AddWithCustomName<Messages_MyMessage>("messages/mymessage")
			.AddWithCustomName<Messages_AnotherMessage>("messages/anothermessage"))
		.(...)
);

and Rebus will then deserialize the message as Messages_MyMessage when it finds "messages/mymessage" in the header.

You can check out this code for an example on how it works: https://github.com/rebus-org/Rebus/blob/master/Rebus.Tests/Examples/ShowHowToAvoidSharingMessageDllsAcrossProcesses.cs