Here, each consumer instance maintains a local, in-memory state that is check-pointed to a write-ahead log (WAL). In the event of failure, the rebuilds state in microseconds, not minutes.
, providing users with a streamlined interface to watch live television channels from around the world. It is often associated with the xcui streams
// This creates a 'listener' on the stream of UI updates let exists = NSPredicate(format: "exists == true") expectation(for: exists, evaluatedWith: label, handler: nil) Here, each consumer instance maintains a local, in-memory