Node.js Express Async Error Handler

Node.js Express Async Error Handler.js

/* refs
http://machadogj.com/2013/4/error-handling-in-nodejs.html
http://nodejs.org/api/process.html#process_event_uncaughtexception
*/

function asyncTryCatch(tryFunction, catchFunction, keepAliveOnHandled)
{
    process.on('uncaughtException', function(ex)
    {// hook onto uncaughtException -> execute catch
        var handled = catchFunction(ex);
        if (!handled)
        {// NOT handled -> throw
            throw ex;
            process.exit(1); //? unnecessary?
        }
        else if (handled && !keepAliveOnHandled)
        {// handled but NOT staying alive -> exit w/ error code
            process.exit(1);
        }
    });
    tryFunction(); // try async code
}

asyncTryCatch(
    function()
    {
        http.listen(8080, function()
        {
            log.info("listening on localhost:8080");
        });
    },
    function(ex)
    {
        if (ex.message.indexOf('listen EADDRINUSE') > -1)
        {// (node v0.10.28) http://nodejs.org/api/net.html#net_server_listen_port_host_backlog_callback
            log.error("port 8080 is already bound. kill the other process first.");
            return true;
        }
        else
        {// (some other error)
            throw ex;
        }
    }
);

log.info("this line is executed");