Question

atm I am using an inner thread for calling a method. This method can throw an Exception. Is there a way to receive the Exception in the outer class to react to it?
Or should I go with writing a “workthread” and adding an observer to it?

I implemented an MVC-Pattern. This this method is called in my model. Now I want to display an msg about the exception. Therefore I need to know the exception.

public void startServer(final String path, final int port, final double speedup) {

    serverIsStopped = false;

    new Thread() {

        public void run() {
            server = new SWTimeServer();
            try{
                server.startServer(port, speedup, path);
            }catch (ClientDisconnectedException e) {
                serverIsStopped = true;
                //TODO
            } catch (ParseException e) {
                serverIsStopped = true;     
                //TODO
            }
        }
    }.start();


}

I came up with this quick solution. But pretty ugly. Your opinions?

private boolean serverIsStopped = true;
private Model model = this;

public void startServer(final String path, final int port, final double speedup) {

    serverIsStopped = false;

    new Thread() {

        public void run() {
            server = new SWTimeServer();
            try{
                server.startServer(port, speedup, path);
            }catch (ClientDisconnectedException e) {
                serverIsStopped = true;
                model.notifyObservers(e);
            } catch (ParseException e) {
                serverIsStopped = true;     
                model.notifyObservers(e);
            }
        }
    }.start();


}

Thanks for answers

Greetings
Tarken

Answer 1

You can’t receive an exception from Thread A from Thread B with any sort of basic try/catch structure that’d you’d normally use. You’ll have to implement some type inter-thread messaging/signaling if you want to do something like that.

Beyond that advice, there’s not much help I can give without a more complete explanation of what exactly you’re trying to do.