@Heiko, @Roland, thanks. The callback in my case essentially makes a decision where to send the future result (to self, to a delegee actor, to the calling actor) plus some error handling, logging and monitoring, so it is a pipe, essentially. I found the code more readable when I make these decisions here in the callback, instead of piping the result to self, making the decisions, and forwarding the message again. Do you think this is an acceptable pattern or would you absolutely discourage to the use of a callback here?
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