server: allow router to report child instances sleep status (#20849)
* server: allow router to report child instances sleep status * refactor * move sleeping to state * nits
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@@ -95,11 +95,19 @@ public:
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callback_update_slots = std::move(callback);
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}
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// Register callback for sleeping state change
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// Register callback for sleeping state change; multiple callbacks are allowed
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// note: when entering sleeping state, the callback is called AFTER sleeping is set to true
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// when leaving sleeping state, the callback is called BEFORE sleeping is set to false
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void on_sleeping_state(std::function<void(bool)> callback) {
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callback_sleeping_state = std::move(callback);
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if (callback_sleeping_state) {
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auto prev_callback = std::move(callback_sleeping_state);
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callback_sleeping_state = [prev_callback, callback](bool sleeping) {
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prev_callback(sleeping);
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callback(sleeping);
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};
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} else {
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callback_sleeping_state = std::move(callback);
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}
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}
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private:
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