gistfile1.java

    private void deleteTown(ObjectOutputStream oos, ObjectInputStream ois) throws IOException, ClassNotFoundException {
        //receive arguments over socket
        final String townName = (String) ois.readObject();
        final FutureBoolean result = new FutureBoolean();
        
        final Object callback = this;
        
        //prepare a Runnable object to delete the town from the server's main thread
        Runnable r = new Runnable() {
            @Override
            public void run() {
                //save the result in a FutureBoolean
                result.setValue(MCTowns.getTownManager().removeTown(townName));

                //notify the calling object that we've finished
                synchronized(callback) {
                    callback.notifyAll();
                }
            }
        };
        
        //tell the server's main thread to run this ASAP
        Bukkit.getScheduler().scheduleSyncDelayedTask(p, r);

        //wait for it to complete
        synchronized(this) {
            try {
                this.wait();
            } catch (InterruptedException ex) {}
        }
        
        //send the result back over the network
        oos.writeObject(result.getValue());
    }