#!/usr/bin/mscgen -Tpng

msc {
       hscale="1.5";

       u [label = "touch/pointer event" ],
       s [label = "runtime/shell-client"],
       a [label = "applaunchd" ],
       g [label = "gRPC-proxy" ],
       c [label = "compositor" ],
       d [label = "libsystemd"];

       |||;

       --- [label = "initial phase - subscribe for signal/status events" ];

       s >> g [label = "subscribe for AGL compositor AppStatusState"];
       g >> c [label = "listen for app_state Wayland events"];

       --- [label = "handling start-up & activation" ];

       u => s [label = "tapShortCut(appid)" ];
       s => a [label = "StartApplication(appid)"];
       a => d [label = "start application's systemd unit"];
       d => a [label = "return status from starting systemd unit"];
       a => s [label = "StartResponse(status = TRUE)"];
       c => g [label = "app_state(app_state = APP_STARTED)"];
       g => s [label = "AppStatusResponse(app_id, APP_STARTED)"];
       s => c [label = "activate_app(app_id)"];
}