simgrid::xbt::signal<void(kernel::resource::NetworkAction*, Host* src, Host* dst)> Link::on_communicate;
simgrid::xbt::signal<void(kernel::resource::NetworkAction*)> Link::on_communication_state_change;
simgrid::xbt::signal<void(kernel::resource::NetworkAction*, Host* src, Host* dst)> Link::on_communicate;
simgrid::xbt::signal<void(kernel::resource::NetworkAction*)> Link::on_communication_state_change;