Executing code when an OpenAF script execution is terminated

Usually there is a need to execute specific code whenever a script is ending/shutting down. Either by normal or forced termination. Examples of this are closing connected sessions to other servers (e.g. databases), deallocate used resources, etc...

In OpenAF this can be achieved using addOnOpenAFShutdown:

addOnOpenAFShutdown(function() {
   // Some closing code
   // ...
});

The following example closes the created mini web server upon normal or forced termination:

ow.loadServer();
 
// Setting up
!pidCheckIn("testserver.pid") && !log("Already running") && exit(0);
// Add code to execute on termination
addOnOpenAFShutdown(function() {
   log("Stopping...");
   hs.stop();
   log("Done!");
});
 
// Starting the httpd server
log("Starting...");
 
var hs = ow.server.httpd.start(8888);
hs.add("/", function(r) {
   return hs.replyOKText("Current date: " + new Date());
});
 
log("Ready");
 
// Converting the script into a daemon so that it doesn't terminate upon Ctrl-C or similar
ow.server.daemon();

Do note that every call to addOnOpenAFShutdown will add a new hook. Upon termination, the last added hook will be the first to be executed and backwards to the first added.