CODEWITHSUNDEEP
javamultithreadingservicejavafxtask
patski
patski

Reputation: 329

Let Task complete before a user cancel it

Lets say I have a task that looks like this and I want it to run till a user presses a button. But when the button is pressed I don't want the thread to break out immediately. I want it to complete whatever it is doing before returning. How can I make this happen?

task = new Service(){
    @Override
    protected Task createTask() {
        System.out.println("Task created");
        return new Task<Void>() {
            @Override
            protected Void call() throws Exception {

                while(true) {
                // Do stuff her

                }
                return null;
            }
        };
    }
};

...
...
task.start();

Upvotes: 2

Views: 38

Answers (1)

James_D
James_D

Reputation: 209553

Just cancel the task from the button, and check for cancellation. If you only check when the task has completed "whatever it is doing", it will complete that before cancelling. For example:

task = new Service(){
    @Override
    protected Task createTask() {
        System.out.println("Task created");
        return new Task<Void>() {
            @Override
            protected Void call() throws Exception {

                while(!isCancelled()) {
                    // Do stuff here

                }
                return null;
            }
        };
    }
};

Button cancelButton = new Button("Cancel");
cancelButton.setOnAction(e -> task.cancel());

Upvotes: 2

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