simgrid::xbt::signal<void(Link*)> Link::onStateChange;
simgrid::xbt::signal<void(NetworkAction*, Action::State, Action::State)> networkActionStateChangedCallbacks;
simgrid::xbt::signal<void(Link*)> Link::onStateChange;
simgrid::xbt::signal<void(NetworkAction*, Action::State, Action::State)> networkActionStateChangedCallbacks;