I'm trying to solve a problem.  I've written a custom "post" (non-primary) 
linker extending AbstractLinker, but I want it to have different behavior 
depending on what the primary linker is.  For example, the primary linker 
could be the "standard" linker or the xsiframe linker. I could attempt to 
guess by using GWT.getVersion() in conjunction with the 
ConfigurationProperty set passed to the linker, but I want something more 
robust.  (I say "guess" because the linker setting doesn't show up in the 
ConfigurationProperty set passed into link() unless you set it in your 
module definition, so if it's not present, presumably you have to use 
GWT.getVersion() to guess what the primary linker is.)

Now, I've found from the source that ModuleDef defines an API 
getActivePrimaryLinker(), but I'm not sure how to get the ModuleDef (for 
the module active when link() on my "post" linker is called).  The only 
idea I have right now is to use Java Reflection to invoke the private 
method ModuleDefLoader.tryGetLoadedModule().  (Since the linker is "real" 
Java and won't be compiled to JS, I assume Reflection will work.)

Obviously this is a huge hack.  How should I be checking the primary linker?

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