[Arp] Multiple Service calls - best way to handle?

[Keith Takayesu]

Ok, I (think) that I need to call a number of services (legacy services,
already built) simultaneously from a command. Each of these commands
returns discrete data. For example: BlueItems, GreenItems, RedItems,
BlackItems, WhiteItems.
 
So, I have a GetItemsByColorCommand, and I feed it the items that I
want, for example, Blue/Green/White or Green/Red, etc. I'd like to have
this Command return only when all the necessary Service data has been
returned.
 
I was thinking that, perhaps, all the service calls would return to the
same responder in the command. The command would maintain a list of
service calls, and which ones have returned. When all have returned,
then it "finishes".
 
Anyone have better/smarter ideas on how to handle this? 
 
Blue skies,
Keith
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