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This seems an almost inveitable consequence of interfaces based on asynchronous message passing. Collaboration scenarios emerge which become impossible to trace. "If this secret handshake is done that way among these three processes, then such and such a use case is satisfied."

One problem with message passing as such is that messages are like function calls, but you can't put a breakpoint into the system and see a call stack!

If we call a function f on object a, which calls b.g(), a breakpoint in b.g() tells us that something called a.f() which then called b.g(). If we send a message f to a, which then sends a message g to b, a breakpoint in b on the receipt of message g tells us diddly squat! The g message came in for some reason, evidently from a. Well, why did a do that? Who knows; a has gone off and is doing something else.




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