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// listener: voidfunc(S, O) or func(S, O) static AutoCloseable vmBus_addListener_basic(S msg, O listener) { Map map = vm_busListenersByMessage_live(); synchronized(map) { Set listeners = map.get(msg); if (listeners == null) map.put(msg, listeners = syncIdentityHashSet()); // We're technically violating the one-synchronized-object-per-thread rule, // but it should be OK here. // TODO: remove empty sets from map ret tempAdd(listeners, listener); } }