/*
 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
 */

package test;

import javafx.application.Application;
import javafx.application.Platform;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.input.MouseEvent;
import javafx.scene.text.Font;
import javafx.scene.text.Text;
import javafx.stage.Stage;

public class RunLaterProblem extends Application {

    private static final int RUN_LATERS = 9000;
    private static final int REGISTERING_SLOWDOWN_LOOP_COUNT = 600000;
    private static final int RUNNING_SLOWDOWN_LOOP_COUNT = 1000000;

    public static void main(String[] args) {
        Application.launch(args);
    }

    private void doSomeWork(int count) {
        for (int i = 0; i < count; i++) {
            int j = i;
            j++;
        }
    }

    @Override public void start(Stage stage) {
        stage.setTitle("RunLaterProblem");

        final Text t = new Text("Click the scene now");
        t.setFont(new Font(20));
        t.setTranslateY(50);

        Scene scene = new Scene(new Group(t), 600, 450);

        stage.setScene(scene);
        stage.show();

        scene.setOnMousePressed(new EventHandler<MouseEvent>() {
            @Override public void handle(MouseEvent event) {
                System.out.println("Processing click");
                t.setText("Clicked");
            }
        });

        Platform.runLater(new Runnable() {
            public void run() {
                System.out.println("Registering runLaters..");
                for (int i = 0; i < RUN_LATERS; i++) {
                    final int count = i;
                    Platform.runLater(new Runnable() {
                        public void run() {
                            if (count % 1000 == 0) {
                                System.out.println("Processing runLater #" + count);
                            }
                            if (count == 8999) {
                                System.out.println("Processing the last runLater");
                            }

                            doSomeWork(RUNNING_SLOWDOWN_LOOP_COUNT);
                        }
                    });

                    doSomeWork(REGISTERING_SLOWDOWN_LOOP_COUNT);
                }
                System.out.println("RunLaters registered.");
            }
        });
    }
}