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Doesn't it have performance consequences? Yes, but how much ? e.g. how often are you querying the service (and the registry). And how much interaction with the service is going on. e.g. are you querying the registry once and then conducting a complex interaction with the service. If your registry service is lightweight (and I can't imagine it wouldn't ...


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There's not a lot of information provide in the question, such as the responsibilities of the various phases, in terms of contract or artifacts/events maintained. However, you have two choices, polling and notification. Polling is inefficient at high frequencies, but sometimes a good option if you need/want to do things on a batch basis, say daily or ...


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These are not peripheral, these are standard use cases. They have ports/layers/etc that talk to the actual device controllers. https://blog.8thlight.com/uncle-bob/2012/08/13/the-clean-architecture.html actually calls this out fairly well. The device APIs are no different from a Database API. You call it the same way, encapsulating it just like you would ...



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