The reference was: "Programming Distributed Computing Systems" by Varela (2013). On pg 172 they discuss a particular aspect of the SALSA (2001) programming language (a language by the same author):
"The ActorService ... is used to annotate behaviors whose instances are not to be garbage collected. The reason is that it is possible to create references to instance of behaviors implementing this interface from their [host and path]"
They proceed to describe how an instance of an ActorService would be routed using a host and path. They are, in effect, describing technology similar to a proxy plus service. However, their specific representation is inappropriate for microservices. Interesting tho :)
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