Disable a Button while a save operation runs

Disable the button before submitting the save to a worker thread. Read the Environment on the environment thread and use Environment.runLater() with it for the final UI update, because webforJ components can only be changed from the environment thread.

import com.webforj.Environment;
import com.webforj.component.Composite;
import com.webforj.component.button.Button;
import com.webforj.component.button.ButtonTheme;
import com.webforj.component.html.elements.Div;
import com.webforj.router.annotation.Route;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

@Route("order-save")
public class OrderSaveView extends Composite<Div> {
  private final Div self = getBoundComponent();
  private final Button save = new Button("Save", ButtonTheme.PRIMARY);
  private final OrderService orderService = new OrderService();
  private final Order currentOrder = new Order("A-1001");
  private final ExecutorService executor = Executors.newSingleThreadExecutor(r -> {
    Thread worker = new Thread(r, "order-save-worker");
    worker.setDaemon(true);
    return worker;
  });
  private CompletableFuture<Void> currentSave;

  public OrderSaveView() {
    save.onClick(e -> saveOrder());
    self.add(save);
  }

  private void saveOrder() {
    if (currentSave != null && !currentSave.isDone()) {
      return;
    }

    save.setEnabled(false);
    save.setText("Saving...");

    Environment env = Environment.getCurrent();
    currentSave = CompletableFuture.runAsync(
        () -> orderService.persist(currentOrder),
        executor);

    currentSave.whenComplete((result, error) -> Environment.runLater(env, () -> {
      if (!save.isDestroyed()) {
        save.setEnabled(true);
        save.setText(error == null ? "Saved" : "Try again");
      }
    }));
  }

  @Override
  protected void onDidDestroy() {
    if (currentSave != null) {
      currentSave.cancel(true);
    }
    executor.shutdownNow();
  }

  public record Order(String orderNumber) {}

  public static class OrderService {
    public void persist(Order order) {
      // Replace this with your repository, REST client, or database call.
    }
  }
}