Why bind doesn' work?

Question

Hi, please help me to understand why bind doesn't work.
Here is my code:
/** Simple enum used in bean. */
public enum CommandType {
    NOP, CREATE, UPDATE, DELETE, MOVE;
/** just simple bean. */
public class Command {
    private CommandType commandType;
    private Integer objectId;
    /** Getters and setters are here*/
    @Override
    public String toString(){
        return "Command{commandType=>"+commandType.name()+",objectId=>"+objectId+"}";
* Enum for singleton pattern realization.
* The idea: currentCommand is changed in single threaded environment. JavaFX is binded on this filed.
public enum CommandPublisher {
    PUBLISHER;
    /** For generating random Integers. */
    private Random random = new Random();
    /** Trying to bind JavaFX on this field value. */
    public Command currentCommand = new Command(CommandType.NOP, -1);
    /** Getter... */
    public Command currentCommand(){
        return currentCommand;
    /** Set new value. */
    public void setCommand(Command newCommand){
        currentCommand = newCommand;
    /** Utility method. Just set new command to currentCommand. */
    public Command generateRandomCommand(){
        return new Command(CommandType.CREATE, random.nextInt());
    public void setNewRandomObjectId(){
        currentCommand.setObjectId(random.nextInt());
/** JavaFX code*/
/** on replace works only one: when CommandPublisher is initialized, javaFXcurrentCommand  gets new value,
*   was: null, became: Command{commandType=>NOP,objectId=>-1}
var javaFXcurrentCommand = bind CommandPublisher.PUBLISHER.currentCommand on replace oldValue{
   println("Bind? oldValue={oldValue}, newValue={javaFXcurrentCommand}");
Stage {
    title: "JavaFX bind on Java object field. "
    scene: Scene {
        width: 250
        height: 80
        content: [
            Text {
                font : Font {
                    size : 16
                x: 10
                y: 30
                content: "Application content"
            Button {
                 text: "Change currentCommand through CommandPublisher"
                onMouseClicked:
                function(e: MouseEvent) {
                    println("Mouse clicked -> Change currentCommand through CommandPublisher");
                    /** JavaFX var realy gets new objectId though java object field. But "on replace"  doesn't work. */
                    //CommandPublisher.PUBLISHER.setNewRandomObjectId();
                    /** Tried to use these methods: nothing happens. */
                    //CommandPublisher.PUBLISHER.currentCommand = CommandPublisher.PUBLISHER.generateRandomCommand();
                    //CommandPublisher.PUBLISHER.setCommand(CommandPublisher.PUBLISHER.generateRandomCommand());
                    println("currentCommand -> {javaFXcurrentCommand}");
                    println("Mouse clicked ##");
}Sample output:
init:
deps-jar:
compile:
jar:
standard-run:
Bind? oldValue=null, newValue=Command{commandType=>NOP,objectId=>-1}
Mouse clicked -> Change currentCommand through CommandPublisher
currentCommand -> Command{commandType=>NOP,objectId=>-1}
javaFXcommand -> Command{commandType=>NOP,objectId=>-1}
Mouse clicked ##
Mouse clicked -> Change currentCommand through CommandPublisher
currentCommand -> Command{commandType=>NOP,objectId=>-1}
javaFXcommand -> Command{commandType=>NOP,objectId=>-1}
Mouse clicked ##
As you can see, "on replace" is fired only once: when Enum became initialized.
mouse clicking doesn't force "on replace" to work.
What do I do wrong?

Answer 1

Hi, please help me to understand why bind doesn't work.
Here is my code:
/** Simple enum used in bean. */
public enum CommandType {
    NOP, CREATE, UPDATE, DELETE, MOVE;
/** just simple bean. */
public class Command {
    private CommandType commandType;
    private Integer objectId;
    /** Getters and setters are here*/
    @Override
    public String toString(){
        return "Command{commandType=>"+commandType.name()+",objectId=>"+objectId+"}";
* Enum for singleton pattern realization.
* The idea: currentCommand is changed in single threaded environment. JavaFX is binded on this filed.
public enum CommandPublisher {
    PUBLISHER;
    /** For generating random Integers. */
    private Random random = new Random();
    /** Trying to bind JavaFX on this field value. */
    public Command currentCommand = new Command(CommandType.NOP, -1);
    /** Getter... */
    public Command currentCommand(){
        return currentCommand;
    /** Set new value. */
    public void setCommand(Command newCommand){
        currentCommand = newCommand;
    /** Utility method. Just set new command to currentCommand. */
    public Command generateRandomCommand(){
        return new Command(CommandType.CREATE, random.nextInt());
    public void setNewRandomObjectId(){
        currentCommand.setObjectId(random.nextInt());
/** JavaFX code*/
/** on replace works only one: when CommandPublisher is initialized, javaFXcurrentCommand  gets new value,
*   was: null, became: Command{commandType=>NOP,objectId=>-1}
var javaFXcurrentCommand = bind CommandPublisher.PUBLISHER.currentCommand on replace oldValue{
   println("Bind? oldValue={oldValue}, newValue={javaFXcurrentCommand}");
Stage {
    title: "JavaFX bind on Java object field. "
    scene: Scene {
        width: 250
        height: 80
        content: [
            Text {
                font : Font {
                    size : 16
                x: 10
                y: 30
                content: "Application content"
            Button {
                 text: "Change currentCommand through CommandPublisher"
                onMouseClicked:
                function(e: MouseEvent) {
                    println("Mouse clicked -> Change currentCommand through CommandPublisher");
                    /** JavaFX var realy gets new objectId though java object field. But "on replace"  doesn't work. */
                    //CommandPublisher.PUBLISHER.setNewRandomObjectId();
                    /** Tried to use these methods: nothing happens. */
                    //CommandPublisher.PUBLISHER.currentCommand = CommandPublisher.PUBLISHER.generateRandomCommand();
                    //CommandPublisher.PUBLISHER.setCommand(CommandPublisher.PUBLISHER.generateRandomCommand());
                    println("currentCommand -> {javaFXcurrentCommand}");
                    println("Mouse clicked ##");
}Sample output:
init:
deps-jar:
compile:
jar:
standard-run:
Bind? oldValue=null, newValue=Command{commandType=>NOP,objectId=>-1}
Mouse clicked -> Change currentCommand through CommandPublisher
currentCommand -> Command{commandType=>NOP,objectId=>-1}
javaFXcommand -> Command{commandType=>NOP,objectId=>-1}
Mouse clicked ##
Mouse clicked -> Change currentCommand through CommandPublisher
currentCommand -> Command{commandType=>NOP,objectId=>-1}
javaFXcommand -> Command{commandType=>NOP,objectId=>-1}
Mouse clicked ##
As you can see, "on replace" is fired only once: when Enum became initialized.
mouse clicking doesn't force "on replace" to work.
What do I do wrong?