private class Launcher extends Thread{
        private int running;
        private ArrayList<Thread> t;
        private Semaphore s;
        private JFrame frame;
        public Launcher(JFrame frame){
            running = 0;

            this.frame = frame;
        }

        private void interrupt_workers(){
            for(int i = 0; i<t.size(); i++){
                if(t.get(i).isAlive()) t.get(i).interrupt();
            }
        }

        private boolean first_threads(){
            boolean too_much_threads = false;
            for(int i = 0; i < model.getRowCount(); i++){
                if(i > model.getRowCount()){
                    too_much_threads = true;
                    break;
                }
                if(isInterrupted()){
                    interrupt_workers();
                    return too_much_threads;
                }
                WebWorker w = new WebWorker((String)model.getValueAt(i, 0), i, frame);
                t.add(w);
                w.start();
                running++;
            }
            return too_much_threads;

        }

        public void run(){
            s = new Semaphore(0);
            boolean too_much_threads = first_threads();
            if(!too_much_threads){
                while(true){
                    if(running == 0) break;
                    if(isInterrupted()){
                        interrupt_workers();
                        return;
                    }
                    s.tryAcquire();
                    WebWorker w = new WebWorker((String)model.getValueAt(t.size(), 0), t.size(), frame);
                    t.add(w);
                    w.start();
                    running++;
                }
            }
        }
    }