See the reflection of changes made to the model to a background thread

Hello

I have problems when I try a chart reflect changes to graph data that are made in a task or a background Service Thread. To simplify things, I tried to change the label of a button several times in a background thread using a task. Here is the code:

SerializableAttribute public class JavaFXApplication7 extends Application {}

Public Shared Sub main (String [] args) {}
Launch (args);
}

@Override
public void start (point primaryStage) bird Exception {}
primaryStage.setTitle ("Hello World!");
last button btn = new Button ("Hello world!");
Root StackPane = new StackPane();
root.getChildren () .add (btn);
primaryStage.setScene (new scene (root, 300, 250));
primaryStage.show ();
Task changeTask = new Task() {}
@Override
protected Object call() throws Exception {}
for (int i = 0; i < 5; i ++) {}
btn.textProperty () .set (String.valueOf (i));
System.out.println ("label together:" + String.valueOf (i));
Thread.Sleep (1000);
}
Returns a null value.
}
};
changeTask.run ();
}
}

What I observe is that the scene is displayed, but with no button above, then I see five times out of the background task thread and then the button with the label of the iteration (4) final. Why the No button when the ChangeTask is on? I expect to see the button change its label every second for 5 seconds.

Am I missing something? How could I achieve such behavior?

Thank you
Peter

It's all wrong ;-)

Let's run through some of the problems:
1. you have not created a new thread, you use just the task on the JavaFX application thread. To create a new thread and run your task on it, something like that.

Executors.newSingleThreadExecutor().execute(changeTask);

2. Once you actually start the task running code in its own thread, you should not change the properties or the things that affect the scene graph. that is, do not do this in the thread calling method:

btn.textProperty().set(String.valueOf(i));

Instead, to get the dynamic multiple changes at different times of the task (for example, the partial results), either, bind the text property of the button to the message property or the progress of the task and update the message and progress in your feed or use the model of partial results documented here: http://docs.oracle.com/javafx/2/api/javafx/concurrent/Task.html

3 looking at the JavaFX jira (http://javafx-jira.kenai.com) there is some bugs related to changing dynamically the data in a chart - it works most of the time, but there are occasions where it produces only results, therefore, even once you get your sample app button works, be careful when you try to apply this same method to the data in the chart.

Why the No button when the ChangeTask is on?

Because the task runs on the Thread of Application JavaFX and JavaFX system triggers not an impulse made until the Thread of the JavaFX Application was abandoned by user code.

I advise to re-read the documentation for JavaFX 2.1 task:
http://docs.Oracle.com/JavaFX/2/threads/jfxpub-threads.htm
http://docs.Oracle.com/JavaFX/2/API/JavaFX/concurrent/task.html

Published by: jsmith on May 2, 2012 14:06

Another way to communicate the progress or the partial results of the user interface is the method of Platform.runLater, mentioned in the post from Daniel.

Published by: jsmith on May 2, 2012 14:56

I guess I should also mention that the method recommended (at least for me) to do this kind of treatment (for example, a loop with a quick update, followed by a period of constant of inactivity), would be to use a timeline instead of a task:
http://docs.Oracle.com/JavaFX/2/API/JavaFX/animation/timeline.html
http://docs.Oracle.com/JavaFX/2/animations/basics.htm#CJAFADFJ

Tags: Java

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