Supporting multiple languages by a single plugin

[evilguest]

Hello everyone. I've made a good progress with the DSL language we're designing.
Now I am trying to add support for yet another language, which is also DSL, intended to be used in a combination with the first DSL.
I am not sure what would be a correct architecture here.
So far I've tried to duplicate everything I've got for the first language:

1. Implemented a new class inherited from the VirtualCode; this class "knows" the parser to use with the code
2. Added the language detection logic to the LanguagePlugin implementation:

 getLanguageId(scriptId: URI) {
    if(scriptId.path.endsWith(".pdl"))
      return PDL;
    if(scriptId.path.endsWith(".rpl") || scriptId.path.endsWith(".hive"))
      return RPL; 
    return undefined;
  };

3. Added the proper branches to the CreateVirtualCode method in my LanguagePlugin implementation
4. Added the second implementation of the LanguageService (as the language features supported are substantially different), that creates a second implementation of the LanguageServicePlugin.

The issue is that every event gets fired for both Language Service Plugin instances. I.e. getDiagnostics gets called in each of them.
Is there any way to properly route the events, so each language is handled by it's own Language Service?
Is there a better way to handle this configuration?