Saturday, September 24, 2022
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How does push notification expertise work on iOS?

Just like this query, how does the expertise work in Apple? Do they use sockets underneath the hood with 1 service making an attempt to hear for all apps?

I am studying system design for to create fb messenger / whatsapp, my understanding is that this:

  1. when a messaging app is open, then websocket is open, thus the simply server can push the message within the message app
  2. when whatsapp is closed, then socket can also be closed? thus they notify consumer from the push notification service, is that this an accurate assumption?
  3. if the socket is closed from the whatsapp app, then does the server look forward to the consumer to be again on-line to re-download all of the message? thus there’re 1 tick and a pair of tick (delivered) in whatsapp?


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