refresh label not working correctly javafx - javafx

Question

I have a problem with a refresh on a Label.
I have an function like this :
public void majMontantPaye(Double montantPaye) {
System.out.println("montant paye : "+montantPaye);
setMontantPaye(this.montantPaye+montantPaye);
Platform.runLater(() -> labelMontantPaye.setText(String.format("%.2f", this.montantPaye)+Messages.getMessage("0052")));
}
And My function is call by an API. This API communicate with a machine who allow to insert coin. And my function must to show the sum insert in the machine.
The problem is, when I insert a lot of coin in the same time in the machine, my function is correctly call every coin detected, so the System.out.println("montant paye : "+montantPaye); is correctly show every coin detected, BUT the Label "labelMontantPaye" is not refresh to every coin detected. Just on finish with the total sum.
I guess that the UI is not correctly refresh but I don't know how refresh correctly my Label.
Help please and sorry for mistake, i'm french.

Answer 1

You can follow the logic below:
As mentioned in the comments:
Using Platform.runLater(...) you queue the task into the JavaFXThread. But when you have many "events" you will only see the last result. (And maybe previous ones for a short time).
🍄Use a BlockingQueue to store each coin that is inserted.Use the method below(also have a look at the tutorial for the available methods,here i am using put which is blocking the current thread if a maximum of coins are inserted into the Queue,if you don't want this set the maximum to something like 500.000):
public void insertCoin(//maybe the kind of coin){
//add the coin into the BlockingQueue
blockingQueue.put(//coin);
}
Use a Thread which is running an infinity loop.The Thread is waking up
every time a new coin is inserted and when that is done , that Thread
waits JavaFXThread to refresh the Label Text:
new Thread(() -> {
//Run an infinity Thread
while (true) {
// Blocks until the queue has really any coins inserted
blockingQueue.get();
// Synchronize with javaFX thread
CountDownLatch latch = new CountDownLatch(1);
Platform.runLater(() -> {
label.setText(....);
latch.countDown();
});
// Block the Current Thread until the text is refreshed from
// JavaFX Thread
latch.await();
}
}).start();