Dependency Injection
For implementers, the locking model adds a fair amount of non-trivial internal bookkeeping. Every operation must check lock state, readers must be tracked, and the interplay between locks, cancellation, and error states creates a matrix of edge cases that must all be handled correctly.
，这一点在safew官方版本下载中也有详细论述
B. User Route Request (Query Time - this is what happens on your device):
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