38     public abstract static class Callback {  class in RemoteConference
55     private final Set<Callback> mCallbacks = new CopyOnWriteArraySet<>();
83         for (Callback c : mCallbacks) {  in setDestroyed()
101             for (Callback c : mCallbacks) {  in setState()
112             for (Callback c : mCallbacks) {  in addConnection()
123             for (Callback c : mCallbacks) {  in removeConnection()
133             for (Callback c : mCallbacks) {  in setConnectionCapabilities()
143         for (Callback c : mCallbacks) {  in setConferenceableConnections()
153             for (Callback c : mCallbacks) {  in setDisconnected()
249     public final void registerCallback(Callback callback) {  in registerCallback()
253     public final void unregisterCallback(Callback callback) {  in unregisterCallback()