MVC pattern implementation in Contact Management App

public static void main(String[] args) {
    ThemeManager.setupLookAndFeel();   // apply FlatLaf before any component is created

    EventQueue.invokeLater(new Runnable() {
        public void run() {
            new ventana().setVisible(true);
        }
    });
}

// Form inputs — the controller reads these to build a persona
public JTextField txt_nombres;
public JTextField txt_telefono;
public JTextField txt_email;
public JComboBox<String> cmb_categoria;
public JCheckBox chb_favorito;

// Action buttons
public JButton btn_add;
public JButton btn_modificar;
public JButton btn_eliminar;
public JButton btn_exportar;

// Filter / search
public JTextField txt_buscar;
public JComboBox<String> cmb_filtro_categoria;

// Table
public JTable tbl_contactos;
public DefaultTableModel modeloTabla;

// Status
public JLabel lbl_estado;

public class logica_ventana implements ActionListener, ListSelectionListener, ItemListener {

    private final ventana delegado;
    private final personaDAO dao;
    private final I18n i18n;
    private List<persona> contactos;

    // Concurrency
    private final Object contactosLock = new Object();   // plain monitor for list access
    private final Object exportLock    = new Object();   // plain monitor for CSV writes
    private final ReentrantLock editLock = new ReentrantLock(); // tryLock for edit ops
    private final ExecutorService exportExecutor       = Executors.newFixedThreadPool(2);
    private final ExecutorService notificationExecutor = Executors.newSingleThreadExecutor();
    private final AtomicInteger searchSeq  = new AtomicInteger(0);
    private final AtomicInteger busyCount  = new AtomicInteger(0);
}

private void configurarEventos() {
    // Button actions
    delegado.btn_add.addActionListener(this);
    delegado.btn_eliminar.addActionListener(this);
    delegado.btn_modificar.addActionListener(this);
    delegado.btn_exportar.addActionListener(this);

    // Combo boxes and checkbox
    delegado.cmb_categoria.addItemListener(this);
    delegado.cmb_filtro_categoria.addItemListener(this);
    delegado.cmb_idioma.addItemListener(this);
    delegado.chb_favorito.addItemListener(this);

    // Table row selection
    delegado.tbl_contactos.getSelectionModel()
        .addListSelectionListener(this);
}

private void solicitarBusquedaAsync() {
    final int seq = searchSeq.incrementAndGet();   // stamp this request

    if (searchWorker != null && !searchWorker.isDone()) {
        searchWorker.cancel(true);
    }

    searchWorker = new SwingWorker<RowFilter<Object, Object>, Void>() {
        @Override
        protected RowFilter<Object, Object> doInBackground() {
            // builds combined text + category RowFilter off the EDT
            String texto = delegado.txt_buscar.getText().trim();
            // ... build and return combined filter
            return null;
        }
        @Override
        protected void done() {
            if (isCancelled() || seq != searchSeq.get()) return;
            SwingUtilities.invokeLater(new Runnable() {
                @Override public void run() { sorter.setRowFilter(/* filtroFinal */null); }
            });
        }
    };
    searchWorker.execute();
}