[Sis-ams] a design question for us to think about

[Scott Burleigh]

Krupiarz, Christopher wrote:
> Scott,
>
> Thanks that helps.  Are messages that are published instead of announced
> handled in a different fashion between continuia?
Yes, slightly, but this difference is invisible to the recipient except 
for this phenomenon that we're discussing here -- that a node can 
receive remotely-announced messages that it would not receive if those 
messages were announced locally.  A node never receives published 
messages that it didn't subscribe to, regardless of whether the messages 
are published locally or remotely.
> Are published
> messages not put in the envelope data structure?
Yes, they are.  But the RAMS gateway knows which nodes in the local 
continuum subscribed to which published messages, and it only forwards 
those messages (via the envelope structure) to the nodes that subscribed 
to them.
> I guess I'm confused
> about the differences of how messages which arrive from a remote
> continuum to a node depended on how they are sent (either published or
> announced).
>   
It is kind of confusing.  The spec tries to explain the differences as 
clearly and unambiguously as possible, but nonetheless this stuff not at 
all obvious.  The Remote AMS section is easily the densest and most 
difficult part of the book, because what we're trying to do is 
surprisingly difficult to do in a general and efficient manner.  It 
would have been a lot simpler if we didn't need to support remote-Send 
and remote-Announce in addition to remote-Publish.  But I think we've 
got it worked out now and I believe the investment will prove to be 
worthwhile.

Scott